rii'.i:. 



41 



tudinal lanielhe; :i pel 1 ure <>\ al , slight ly produced in front, inner 

 lip smooth, rounded, slightly relaxed in front. outer lip >imple, 

 acute. T. (iori.mi, A. Ad., II'. CoOtt f,V////v// Am. 



Snbgcnus GYIK>TI>|'SIS, , 



Shell tliin, spirt- elevated. umbilicus \\idc, funnel-shaped, la-t 



whorl anguhitcd :ilovt' and In-low t lie periphery, mid <-o\. 

 with vi-i-y thin foli:itrd loiiritiidiii:d v:irict-s. T. s< .1 AMOSA, (inhl). 

 Cretaceous, N. Carolina. (IM. 7, iijr. 39). 



? Genus SEPARATISTA, Gray, 1847. 



Shell subdiscoidal, with very short spire, the last whorl sepn- 

 rati-d I roin its predecessors, forming a very large umbili< 

 aperture slightly channeled at the base. This group, which I 

 i'ormeily included in Muricida 1 (see Manual, ii, p. 213), is doubt- 

 fully referred to Trichotropidai by Dr. Fischer and others. 



Genus TORELLIA, Loven, in Jeffreys, 1867. 



Shell narrowly perforated, globular, covered by a pilose epi- 

 dermis ; spire short, depressed; mouth rounded, with a hardly 

 perceptible basal sinus; lip thin, curved; columella concave, 

 subtruncated at the base. 



Differs from Trichotropis in being holostomate and subglobose. 



Trachyoma, Seguenza, is a synonym. T. VESTITA, Jetir. 

 Arctic Seas. 



Genus SEGUENZIA, Jeffreys, 1876. 



Shell thin, turbinate or subtrochoid, translucent, the outer 

 layer very slight, somewhat nacreous in fresh specimens, with 

 spiral carinatious ; aperture irregular, sinuous behind, columella 

 twiMed, base with a sinus. Operculum thin, oval, with sub- 

 central nucleus, and with obsolete?, numerous concentric lines 

 (IM. 7, iig. 41). Radula (I 1 !. 7, iig. 40). 



The position of this group of deep-sea minute shells is not well 

 rtained. The soft parts have not been de-cribed. Verrill, 

 who obtained t he dentition, formed for the species a family, which 

 he located near Chenopus; Dr. Jeffreys places them near Solar- 

 iida- and Dr. Watson in Trochida- (on account of the operculum 

 and slight pearly layer of the shell). I place the group here, for 

 the present. 



