1867.] DR. J. E. GRAY ON THE CALYPTRvEID^. 741 



2. MiTRELLA spiNiFERA, 11. s. (not named). 



Shell depressed, pellucid, orown-spotted, rugose, with oblique ra- 

 diating ridges armed with tubular spines. 



Hab. Kurrachee. Internal lamina imperfect. 

 See Trochita spinnlosa, Chenu, Man. f. 2344. 



3. MiTRELLA SUBREFLEXA. 



Calyptr^a subreflexa. Carpenter. 

 Pale brown, smooth, pellucid. 

 Hab. California. 



4. MiTRELLA PELLXJCIDA. 



Calyptrcea pellucida. Reeve. 



Shell very thin, transparent, smooth. 



Hab. — ? 



2. Trochilina. 



Shell like former ; but the internal })late is much more oblique 

 and spiral, and the reflexed part of the upper portion of the pillar- 

 lip is united to the surface of the plate, forming a short deep com- 

 pressed perforation near the apex of the cavity. 



1. Trochilina conica. 



CahjptrcEa conica, Brod. 



Shell conical, rather thin, pale, brown-spotted, smooth. 



Hab. 



This shell varies greatly in the extent of the internal lamina : in 

 most specimens it occupies much more than one whorl ; but in 

 another, which may have been injured, the plate docs not occupy 

 more than one-third of a whorl. 



2. Trochilina fastigiata. 



Calyptrcea fastigiata, Gould. 



Shell conical, circular, smooth, with a smooth pale-brown perios- 

 traca. 



Hab. Vancouver's Island. 



3. Trochilina adspersa. 

 Calyptrcea adspersa, C. B. Adams. 

 Shell depressed, pellucid, brown-dotted. 

 Hab. ? 



4. Trochilina mamillaris. 

 Calyptrcea mamillaris, Brod. 



Shell solid, white, smooth, opaque, with a red or purple tij) 

 internal plate very thin, transparent. 

 Hab. California. 



