TRICHOTROPIS. 323 



inagno, medio subangulato, superne carinis tribus prominenti- 

 oribus subcrenulatis et intermediis minoribus, infra, plurimis 

 aequalibus ciucto ; apertura expansa, infra subacuminata, labro 

 crenato biangulato. — The most globose of all the species ; thick, 

 with close-set, thick, crenulated ribs, alternately more prominent. 

 The aperture is wide, the outer lip expanded, angular, and crenated. 



11. bicarinata, Brod. et Sowb., (f. 7, 8). — Angulato-subglo- 

 bosa ; anfractibus angulatis, paucis, ultimo maximo, medio carinis 

 duabus ciliatis, distantibus cincto, umbilico lato, margine ciliato ; 

 apertura maxima, subquadrata, columella lata, subplanulata. — 

 Angularly globose, last whorl large, with two distant ribs in the 

 centre and a straight broad space between. The aperture is large, 

 rather square; the columella broad and flat. 



12. unicakinata, Sowb., (f. 10). — Angulatim subovalis, laevi- 

 gata; spira products, anfractibus supra angulatim carinatis, supra 

 angulum complanatis, depressis ; ultimo inagno, carina minute 

 carinata, umbilico latissimo, margine carinato ; apertura oblique 

 subquadrata, termine oblique acuminato; labro exleino medio 

 rotundato, supra et infra contracto. — The finest specimen yel 

 known of this remarkably-formed shell is that in the British 

 Museum, from which the figure in Sowerby's ' Genera of Shells ' 

 was taken. 



