H E M I S I N U S . 



Plate V. 



Species 19. (Mus. Cuming.) 



Hemisinus contractus. Hem. testa subulatd, tenuiculd, 

 pallide olivacea, anfractibus novum, Icevibus, declivi- 

 planatis, ultimo rotundato ; apertura parvd, columella 

 teuue calloso-contortd. 



The contracted Hemisinus. Shell subulate, rather 

 thin, pale-olive, whorls nine, smooth, slopingly flat- 

 tened, last whorl rounded; aperture small, columella 

 thinly callously twisted. 



Melania contractu, Lea, Pro. Zool. Soc. 1850, p. 182. 



Hab. Seychelle Islands. 



The columella in this little Seychelle Island species, 

 like 77. dermestoidea from the same locality, has quite the 

 twisted columella and notched channel of the larger Bra- 

 zilian species. 



Species 20. (Fig. a, b, Mus. Cuming.) 



Hemisinus ornatus. Hem. testa subfusiformi-turbinatd, 

 luteo-fuscd, lineis rufis punctato-interruptis undique 

 cinctd, anfractibus Sep tern, Icevibus, convexiusculis, ul- 

 timo subve?itricoso ; apertura ovatd, columella calloso- 

 reflexd. 



The ornate Hemisinus. Shell subfusiformly turbi- 

 nated, yellowish-brown, spirally encircled throughout 

 with dot-interrupted red lines, whorls seven, smooth, 

 slightly convex, the last somewhat ventricose ; aper- 

 ture ovate, columella callously reflected. 



Melania oruata, Poey, Moll. Cuba. 



Hab. Brazil. 



The columella!' extremity of this species presents a link 



intermediate between this genus and Melania, being 



scarcely sufficiently twisted to leave a notch. 



Species 21. (Fig. 21 a, b, c, d, Mus. Cuming.) 

 Hemisinus Kochii. Hem. testa fusiformi-turbinatd, ad 

 basin productd et recurvd, olivacea, fusco plus minus 



tinctd vel strigatd et punclis rufis aspersd, spird pro- 

 ductd, anfractibus seplem ad octo, spiraliter lineari- 

 sulcalis, superne rotundato-gibbosis, inferne contractu, 

 suturis late canaliculatis ; apertura ovatd, columella 

 calloso-contortd. 



Koch's Hemisinus. Shell fusiformly turbinated, pro- 

 duced and recurved at the base, olive, more or less 

 stained and striped with brown, and sprinkled with 

 red dots, spire produced, whorls seven to eight, spi- 

 rally linearly grooved, rotundately gibbous round the 

 upper part, contracted at the lower, sutures broadly 

 channelled; aperture ovate, columella callously twisted, 



Melania Kochii, Bernardi, Journ. Conch, vol. v. p. 83. 

 pi. 3. f. 6. 



Hab. Brazil. 



Distinguished by a peculiar gibbously fusiform growth, 

 with the extremity produced and slightly reflected. The 

 colouring, it will be seen by the two specimens figured, 

 varies in being either striped with brown upon a yellowish- 

 olive ground, or uniformly stained. 



Species 22. (Fig. a, b, Mus. Cuming.) 

 Hemisinus tenuilabris. Hem. testa fusiformi-obkngd, 

 ustulato-olivaced, nigra longitudinaliter strigatd, an- 

 fractibus paucis, lavigatis, declivi-planatis, ultimo ad 

 basin contracto et spiraliter sulcato ; apertura angusti 

 oblougo-ovatd, columella teuue calloso-contortd. 

 The thin-lip Hemisinus. Shell fusiformly oblong, 

 swarthy -olive, longitudinally striped with black, 

 whorls few, smooth, slopingly flattened, last whorl 

 contracted and spirally grooved at the base; aper- 

 ture narrowly oblong-ovate, columella thinly callously 

 twisted. 

 Behn, MS. in Mus. Cuming. 

 Hab. Brazil. 



A richly-coloured dark-striped shell, readily distinguish- 

 able by its narrow fusiformly obloug growth. 



January, 1860. 



