162* 



depressed, obtuse, slightly prominent at the apex ; volutions four, 

 rounded, slightly depressed posteriorly ; suture distinct, marked 

 with a nearly obsolete line in front ; aperture nearly circular ; 

 peritreme slightly thickened posteriorly, thin on the side of the 

 umbilicus, separated from the last volution; umbilicus large, an- 

 teriorly keeled. 



This species is related to C. corrugatum. 



Jamaica. 



187. Cyclostoma volvuloides (Tab. Suppl. xxxi. b, f. 312, 

 313), nobis. 



C. testa subgloboso-conica, pallida, pallido fulvescente zonata 

 et sphacelate ; spira subacuminatfi, apice obtusiusculo j anfractibus 

 quiuque, rotundatis, raptim majoribus, postice spiraliter liratis, 

 antice kevigatis ; sutura distincta ; apcrtura fere circulari, superne 

 subcanalifcra, peritremate albo, subincrassato, reflexo, prope uinbi- 

 licum tenui, antice extenso ; gula subaurantiaca ; umbilico magno, 

 intus spiraliter striato. 



Shell somewhat globosely conical, of a light colour, with pale 

 brownish bands and marks; spire slightly acuminate, with its 

 apex rather obtuse ; volutions five, rounded, increasing rapidly in 

 size, posteriorly spirally grooved, anteriorly smooth ; suture dis- 

 tinct ; aperture nearly circular, slightly canaliculate at the upper 

 part ; peritreme white, somewhat thickened, reflected, thin and 

 spreading forward on the side of the lunbilicus, which is large and 

 spirally grooved ; the throat is somewhat orange-coloured. 



188. Cyclostoma deliciosum (Tab. Suppl. xxxi. b, f. 314, 



315); Ferussac. 



C. testa subgloboso-conica, aurantiaco-castanea, albo-lineata ; 

 spira subacuminata, apice obtusiusculo ; anfractibus 4i, rotun- 

 datis, posticis unicarinatis, ultimo bi- vel tricarinato, carinis albis ; 

 sutura subinconspicua, albicante ; apertura fere circulari, superne 

 subcanalifcra, peritremate tenuiusculo, reflexo, extus albicante, 

 intus castaneo ; umbilico magno, obsolete spiraliter paucistriato, 

 linea albicante unica extus marginato ; operculo crassiusculo, 

 albicante, paucispirali. 



Shell rather globosely conical, of an orange-chestnut colour, 

 with white spiral lines ; spire slightly acuminated, with a rather 

 obtuse apex ; volutions 4>\, rounded, the first with a single keel, 

 the last with two or three keels, which are white ; suture rather 

 indistinct, white ; aperture nearly circular, with a very slight 



