T R C H I T A. 



Species 6. (Fig. a, h, Mus. Cuming.) 

 fKocHiTA LICHEN. Trocli. testd depreasa, concentrke 

 rude plicatd, lenigatd ; alba, subdiaphand, obscure 

 fmco-rufo punctata et lineatd ; appendice interna la- 

 terali, appresse eff'iisd. 

 The lichen Trochita. Shell depressed, concentrically 

 rudely plicated, smooth ; white, subdiaphanous, ob- 

 scurely dotted and lineated with brown-red ; internal 

 appendage lateral, appressly effused. 

 Caltjptraa lichen, Broderip, Pro. Zool. Soc. 1834, p. 37. 

 Hab. Island of Muerte (found on dead shells, in sandy 

 mud, at a depth of eleven fathoms) ; Cuming. 

 This little species would seem to be the representative 

 of our European T. Sinensis. It is of the same typical 

 character, and very closely allied to it in species. 



7. (Fig. a, b, Mus. Cuming.) 

 Trochita subreflesa. Trocli. testd obtuse convexd, 

 cijucentrice irregulariter plicatd, undique promiscue 

 minute spinoso-squamatd, apice spiraliter mamillari; 

 pellucido-albd, femcgineo-riifo tinctd; appendice in- 

 ternd laterali, appresse effusd. 

 The subeeflected Trochita. Shell obtusely convex, 

 concentrically irregularly plicated, everywhere pro- 

 miscuously minutely spine-scaled, apex spirally ma- 

 millary ; transparent-white, stained with rust-red; 

 internal appendage lateral, appressly effused. 

 (Iarpenter, MS. in Mus. Cuming. 

 Hab. Gulf of California. 



Of an irregular globosely convex form, finely spine- 

 scaled throughout, stained towards the margin with a 

 characteristic transparent rust-red. 



Species 8. (Fig. a, b, Mus. Cuming.) 



Trochita spirata. Trocli. testd mbghboso-conicd, cos- 

 tis vnlidis longitudinalibus, subnodosis, diMantibus un- 

 dique plicatd, subliis concavd ; purpureo-cinereo et 

 castaneo cinctd ; appendice interna perampld, troclii- 

 ■ form. 



The spiral Trochita. Shell somewhat globosely 

 conic, plicated throughout with slightly noduled 

 distant strong longitudinal ribs, concave beneath; 

 stained with purple-ash and chestnut ; internal ap- 

 pendage very large, trochiform. s 



Calyptraa spirata, Forbes, Pro. Zool. Soc. 1850, p. 27^. 

 pi. 11. f. 1 a, b. 

 Patella trocliiforwi-s ? Chemnitz, 



Hab. Gulf of California. 



This fine species may be chiefly recognized from its 



congener T. radians by its dark purple-ash and chestnut 



colouring. It is also, in its typical state, more globosely 



conical. 



Species 9. (Fig. a, b, Mus. Cuming.) 



Trochita corrugata. Trocli. testd orbiculari-conicd, 

 pileiformi, extus radiatini comigato-Uratd, intus con- 

 cavd, appendice spiraliter septiformi ; albidd, ferru- 

 gineo vix tinctd. 



The wrinkled Trochita. Shell orbicularly conical, 

 cap-shaped, externally radiately wrinkle-ridged, con- 

 cave within, the appendage being spirally septum- 

 shaped ; whitish, slightly tinged with nist. 



Hab. Callao, Peru ; Cuming. 



The internal appendage of this species is of the same 



spiral septum-shaped structure as in T. radiam, but the 



shell is more deeply concave. 



Species 10. (Fig, a, h, Mus. Cuming.) 

 Trochita solida. Troch. testd cunicd, crassiusculd, 

 coneentrice rude striata; calcareo-albd, apice piir- 

 piired, intus fusco-purpured ; appendice laterali, dia- 

 phand, appresse effnsd. 

 The solid Trochita. Shell conic, rather thick, con- 

 centrically rudely striated; chalk-white, purple at 

 the apex, brown-pmi^le within ; appendage lateral, 

 diaphanous, appressly effused. 

 Hab. Conchagua, Central America. 



A solid, conical, chalk-white species, with a purple 

 apex, brown-purple iu the interior, with a bright, diapha- 

 nous-white, lateral appendage. 



May, 1859. 



