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Recently T. A. Garrard (1963, Journ. Mall Soc. Australia 7:45, pl. 7, fig. 5-6) described Neosimnia tinctura n. sp. from
Moreton Bay. The dentate outer lip excludes it from Neosimnia or Pellasimnia (which genus replaces Neosimnia in the
Indo-Pacific) and from the subfamily Volvinae altogether; it really belongs to the other subfamily, Ovulinae, of the family
Ovulidae (which name must replace Amphiperatidae since the author of Amphiperas, (Gronow), has been declared invalid by
opinion 261 of the International Commission of Zoological Nomenclature).
The general characters of tinctura agree with Primovuia striatula Sowerby and its Eastern subspecies renovata Iredale, which
have been figured in my monograph of Amphiperatinae in 1932 (Proc. Malac. Soc. London 20:58, figs. 17 and 16 respectively),
and differ quite from Pellasimnia formicaria Sowerby and P. subreflexa Adams & Reeve with which Gerrard compared his "new
species." Primovula striatula striatula lives in the Arabian Sea, its subspecies renovata spreads from Malaysia through
Queensland to Sydney, and a third subspecies, verconis Cotton & Godfrey, has been found in South Australia and Albany (see
Schilder 1941, Archiv. Mollusk. 73:107).
The renovata from Mackay and Yeppoon as well as those from Port Jackson are purplish pink with a whitish dorsal zone, a paler
pink outer lip, and orange extremities, the tinctura from Moreton Bay, however, are fawn with the base almost fulvous, but
otherwise identical in general features (as dorsal striation and keel, dentition of the outer lip, funiculum, fossula, orange
extremities, etc.) except in size and shape: Chart by Maria Schilder
As I was able to procure reliable material from Mauritius collectors, it was an opportunity to follow up Dr. Verdcourt's
supposition, in order to clarify the status of C. esontropia. I received numerous specimens of this rather rare species from
Mauritius collectors, especially Mrs. Couacaud, who sent quite a number on loan, including a preserved animal; the latter was
sent to Dr. F A. Schilder for study. The results were as follows:
The shell: All 28 live-collected and 2 sub-fossil specimens were undoubtedly C. esontropia. The majority of specimens had the
"typical" deltoidal shape, while a few were elongate-ovate, resembling C. cribraria in this respect, all specimens had both
sides thickened. The dorsal base colour was mostly a fawnish-orange. Some specimens, however, were orange or reddish-orange,
with pale transverse dorsal zones visible on the dorsum. Both margins were thickly spotted with dark brown, the columellar
spots extending onto the base. On an average, the labial teeth were fewer in number than in C. cribraria. The columellar
teeth did not extend as ridges onto the curved fossula, but appeared as weakly formed, isolated denticles. There was no
specimen without the marginal spotting, and one adult specimen lacked the greater part of the dorsal pattern.
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