180 AMERICAN JOURNAL 



Pfeiffer refers to this species as from Trinidad, on the author- 

 ity of Gill, in Mon., v,* 86,(1868.) See my remarks on the 

 species following. 



10. Conulus vacans, Guppy. Ann. and Mag., xvii, 1866. 



Lives on epiphytal orchids, and also on the roots and stems 

 of ferns. It is not a common species ; occurred near Port-of- 

 Spain and at San Fernando ; also in the island of Grenada. 

 Guppy, 



The following is the author's description : 

 " Shell small, trochiform, depressed, sub-perforate, thin, 

 fragile, pellucid, shining, brownish horn-colored; whorls 5, car- 

 inate, flattened and obliquely striate above, closely covered with 

 fine, longitudinal, rather wavy striae, visible under a lens, and 

 most distinct on the polished under surface ; spire conoidal ; 

 aperture lunate ; peristome simple, acute ; columellar margin 

 slightly reflected; greatest diameter, 0-18 inch; height, 0*12 

 inch. (Height, 2J mill ; diam., 4 mill. Guppy.) 



The animal has four stout tentacles. Mantle filling the aper- 

 ture and projecting, but not reflected over any part of the shell. 

 Foot narrow, truncate, with a small retractile appendage on the 

 truncate tail, tf organ stout, on the right side, below and a lit- 

 tle behind the upper part of tentacles. The foot has a median 

 band separated by a fine line or groove from the lateral portions 

 on each side. Lingual teeth about 30, 5, 0, 5, 30, broad, sub- 

 equal ; central obsolete ; first five laterals symmetrical, with a 

 larger rounded cusp having a smaller cusp of similar shape on 

 each side ; outer laterals bicuspfd, resembling the teeth of Tes- 

 tacetlus." 



Guppy adds that the animal is viviparous ; in the wet seasons 

 individuals are found containing ten or twelve young in different 

 stages. 



I received specimens from Guppy under the name O. vacans, 

 none of which are adult; the largest with four whorls, not cari- 

 nated, and very like H. Q-undlachi, Pfr. In reply to my re- 

 mark to that effect, Guppy writes, "lam quite sure that the 

 shells sent to you as Conulus vacans were that species ; when 

 young they very much resemble O. Gundlachi." 



Gill collected several dead specimens of a small carinated shell 

 which may possibly be of Guppy's species. I sent an adult to 

 Pfeiffer, who returned it with label " Stenoijus lividus, G#ild. ?" 

 It agrees rather closely with Guppy's description and Guilding's 

 figure ; has five whorls, being a dead shell, is not " pellucid shin- 

 ing," but has a deciduous epidermis, on which are microscopic 

 spiral lines ; the periphery is sharply carinated, sensibly modify- 



