MOLLUSCA OF INDIA. 45 
simulans, Adams, a Jamaica form, which is not likely to be related, 
and he would class with it orcula, Bs., barrakporensis, Pfr., and 
infula, Bs., of the East-Indian region. The two last,could hardly be 
classed together on shell-characters, and a genus has already been 
formed for barrakporensis. In the Journ. de Conch. Oct. 1876, 
p. 357, in a revision of the Land Shells of the Nicobars, another 
species is added, viz. H. microtrochus, Moérch, found with the former. 
He thinks Sagdinella may be allied to Streptaxis in its sculpture 
(transverse) ; but this would hardly be a sufticient reason on which 
to form such an alliance, unless combined with other characters. 
Mr. G. Nevill, in his ‘ Hand-list of the Mollusca in the Indian 
Museum, Calcutta,’ p. 35, includes both Sagdinella and Kaliella 
under the subgenus Microcystis, Beck (type ornatella, Beck, from 
Pitcairn Island, a South-Pacific shell) ; and in this he has placed 
most of the minute Indian species, many with most varied cha- 
racters. Knowing that I was engaged working upon these small 
shells he was good enough to send me a specimen named didrichsenit, 
from Batte Malve ; but as it did not agree with the original descrip- 
tion, I applied to the Zoological Museum of the University of Copen- 
hagen for specimens of the shell. Professor Japetus 8. Steenstrup 
responded most cordially to my request and kindly sent me a 
specimen in the Museum, the label in Mérch’s handwriting— 
“ Sagdinella(Hapalus?) didrichsenii, Roepst. 1877, p. 370. Nicobar.” 
The original specimen described in 1872 was collected during the voyage 
of the ‘ Galathea’ by M. Reinhardt, and should be in the Museum 
at Copenhagen, where most of his shells were placed. The Museum 
of Kiel received those of M. Behn ; and Cuming obtained duplicates 
of this last collection described by Pfeiffer, Frauenfeld, &c. I have 
thus been able to figure a typical shell of this genus and clear up all 
uncertainty about it, for which I and other conchologists owe our 
thanks to Prof. Steenstrup. It certainly has no relationship to 
either Sttala or Kaliella in any way; moreover I do not think it is 
quite mature, and it possesses, as Mirch says, some similarity in its 
transverse costulation to that of Streptaais. I here give the original 
description of the shell; the animal is quite unknown ; but whatever 
it may be, it undoubtedly belongs to a group quite distinct to those 
with which Nevill associated it. 
Herix ? (SaepINELLA) prpRicusENm. (Plate IX. figs. 1, 1a.) 
Journ. Conch. Oct. 1872, p. 312. 
Var. B. grandis, Journ. Conch. Oct. 1876, p. 358. 
Nanina (Microcystis), Nev. Hand-list, p. 42. no. 206 (30 sp. 
Nicobar, ex coll. Dr. F. Stoliczka). 
- Original description :—* Testa turbinata, perforate umbilicata, 
erystallina albida nitida, leviter iridescens ; anfr. 34 convexiuseuli, 
costulato-striati, ultimus magnus, spiram fere duplo superans, medio 
obsolete angulatus ; basi levissima ; apertura subrhombea. 
« Diam. maj. 23 mill., axis 2 mill., aperture altit. 14 mill. 
“* Hab. Sambelong, sur les bords de la riviére Galathea ; un seul 
exemplaire. 
