SYKES: ON CERASTUS DINSHAWI. 309 
Both the above-named species are unknown to me, and therefore 
I regret that I am unable to give accurate comparative notes. 
With the new species were found C. candidus, Lam., and a single 
specimen of a form belonging to the group of C. /abiosus, Mull., and 
C. sabeanus, Brgt. While mentioning the last-named it may be 
convenient to note that Dr. Kobelt (/.¢., p. 419) appears to have 
been unaware of the figure given by Bourguignat (/.¢., p. 28, fig. 14), 
and, following Dr. Westerlund, has referred to C. sabeanus with doubt 
a shell from Syria and Cyprus, which he figures, and which appears 
to me to be quite distinct. 
Oropoma cLausum, Sby., and O. Yemenicum, Bret. 
In 1843 Sowerby described and figured! a shell under the name 
of Cyclostoma clausum, stating that it came from Yemen, Arabia. He 
mentions that it is ‘‘ spirally striated posteriorly,” and points out that 
there is a callus covering the umbilicus. Six years later, Pfeiffer” 
described and figured under the name some specimens from the Cuming 
Collection, which are now in the British Museum: whether they be 
the same as those Sowerby described, it is hard to say, but if so, 
then Sowerby’s figures are very bad indeed. Since then practically 
all authors have followed the identification of Pfeiffer, and probably 
that is the wisest course to adopt. 
At p. 330 of the same work, Pfeiffer recorded and figured from 
‘‘Mus. Cuming,” as a variety of clawswm, a shell with a single colour- 
band and a more elevated form. For this Bourguignat proposed ® the 
name Georgia Yemenica, but unfortunately he went on to compare the 
species with clausum, and stated that Yemenica was smooth above 
and below. Pfeiffer made no mention of the sculpture. Thanks to 
Mr. Smith’s kindness, I think I have succeeded in tracing the specimen 
in the Cuming Collection to which Pfeiffer referred; it is, however, 
spirally sculptured in the same manner as O. clausum, and probably 
Bourguignat was judging from the figure given by Pfeiffer—which does 
not show the sculpture stated that the shell was smooth. 
There appear, therefore, to be two forms differing from one another 
chiefly in the amount of elevation of their respective spires. Of the 
more elevated form, I have recently seen specimens collected with 
the shell above described as Oerastus Dinshawi. The colour- banding 
appears not to be a reliable specific distinction, since in only one 
specimen is it present, and then there are several bands. The other 
specimens are all uniformly white, but this does not seem to be due 
to their being dead shells, since some of them show a dark lne in 
the suture of the earlicr whorls. I think, therefore, that there are 
two species, clauswm and Yemenicum, belonging to Georgia, which 
I regard for the present as a section of Otopoma. 
In conclusion, | have to thank Commander Shopland for the shells 
which have given me the opportunity of writing the above notes. 
' Thes. Conch., vol. i, p. 128, pl. xxxi, figs. 266, 267. 
2 Conch.-Cab., Cyclostomacea, p. 147, pl. xx, figs. 13-15. 
3 In Reévoil: ‘‘ Faune et Flore des pays Gomalis,”’ p. 70. 
