H E M 1 S I N U S . 



Plate VI. 



Species 23. (Fig. a, b, Mus. Cumins;.) 



tlEMISINCS GuAYAClUILENSIS. //-'„/. testa uhlirerinln- 



ovatd, lenebroso-olivacea, nigro transverse maculatd, 

 anfractibus perpaucis, lavibus, declivi-convexis, ultimo 

 oblique ventricoso ; apertura ovatd, subampld, colu- 

 mella late calloso-arcuatd. 

 The Guayaquil Hemisinus. Shell shortly ovate, dark- 

 olive, transversely spotted with black, whorls very 

 few, smooth, slopingly convex, the last obliquely ven- 

 trieose; aperture ovate, rather large, columella broadly 

 callously arched. 

 Melania Guayaquilensis, Petit, Journ. Conch, vol. iv. p. 



157. pi. 5. f. 6. 

 Hob. Guayaquil. 



A short, broadly-ovate shell, with a rather open aper- 

 ture, of a dark-olive colour, marked with numerous trans- 

 verse black spots. 



Species 24. (Fig. a, b, Mus. V. d. Busch.) 

 Hemisinus Helena. Hem. testa ovatd, utrinque atle- 

 nuatd, luteo-viridi, fasciis duabus castanets cingulatd, 



anfractibus ijuiui/ue ad sex, eonvexu, concent rice, tenui- 

 costatis, costis versus aperturam evauidis, suturis an- 

 guste iiupressis ; apertura oblongo-ovatd, columella 

 tenui rejlexd. 



The Helena Hemisinus. Shell ovate, attenuated at 

 each end, yellowish-green, encircled with two chest- 

 nut bands, whorls five to six, convex, concentrically 

 finely ribbed, ribs fading towards the aperture, su- 

 tures narrowly impressed ; aperture oblong-ovate, co- 

 lumella thinly reflected. 



Melanopsis Helena, Meder, Philippi, Abbild. und Bescb. 

 Conch, vol. ii. p. 170. pi. 4. f. 4. 



Hob. Java. 



A neatly sculptured species, with a somewhat marine 



aspect, very distinct in typical character from the rest of 



the genus. 



Species 25. (Fig. a to d, Mus. Cuming.) 



Hemisinus nigricans. Hem. testa ovatd, crassd, oli- 

 vaced rel nigricante, anfractibus quinque ad sex, con- 

 vexis, sub lente malleatis et minute crispato-slriatis ; 

 apertura oblongo-ovatd, ad basin profundi emarginatd, 

 columella late incurvd, nigra, ad basin ca/loso-coutortd 

 et truncatd. 



The black Hemisinus. Shell ovate, thick, olive or 

 blackish, whorls five to six, convex, beneath the lens 

 malleated and minutely crisply striated ; aperture 

 oblong-ovate, deeply notched at the base, columella 

 broadly incurved, black, callously twisted and trun- 

 cated at the base. 



Clea nigricans, Adams, Pro. Zool. Soc. 1855, p. 119. 



Uiib. Sarawak, Borneo. 



A stout open-mouthed shell, in which the generic cha- 

 racters of Hemisinus are exaggerated into an abnormal 

 form, which the Messrs. Adams have considered sufficient 

 to characterize as a separate genus. 



Species 26. (Fig. a, b, Mus. Cuming.) 



Hemisinus globosus. Hem. testa globosd, solidd, fusco- 



uii/rieante, anfractibus perpaucis, declivi-rottiudutts, 

 undique dense sulcato-striatis ; apertura late ovatd, 

 columella excavatd et calloso-contortd. 



The globose Hemisinus. Shell globose, solid, brown- 

 black, whorls very few, slopingly rounded, closely 

 groove-striated throughout ; aperture broadly ovate, 

 columella excavated and callously twisted. 



Hah. Pernambuco. 



A solid, globose shell, of rather stout growth, closely 

 groove-striated throughout, in which the columella is un- 

 usually short and excavately callously twisted. 



Januarv, 1SC0. 



