LITTORINA.— Plate XVII. 



Species 97. (Mus. Cuming.) 

 LiTTORiNA coLUMELLABis. LUt. testd ovato-couicd, acu- 

 ta, subventricosd, dense striata, albidd, interdttm punc- 

 tis luteis ferruffineisve sape in strigis conflnentibus 

 pictd; anfraetibus convexis, mduris excamtis ; aper- 

 turd semiorbiculari, columella excavato-depressd,fusco- 

 violaceo tinctd. 

 The pillared Littorina. Shell ovately conical, sharp, 

 rather ventricose, densely striated, whitish, sometimes 

 painted with yellow or rust spots, often running into 

 streaks ; whorls convex, sutures excavated ; aperture 

 semiorbicular; columella excavately depressed, stained 

 with brownish-violet. 

 D'Orbigny, Voy. dans I'Amer. Merid. u. 284. 

 Hab. Pernambuco. 



It is not without some doubt as to its correctness, 

 that I adopt this shell as M. D'Orbigny's L. columellaris, 

 from Pernambuco. It belongs, rather, to the eastern type 

 of the genus, represented by L. undulala, and approaches 

 closely to some colourless varieties of that species. 



Species 98. (Mus. Cuming.) 



Littorina obligata. Litt. testd globoso-tnrbinatd, (eniii, 

 ventricosd, spiraliter dense elevato-striatd, olivaced vel 

 rufo-castaned, fasciis luteolis interruptis interdum cin- 

 gulatd ; an/ractibus rotundalis ; aperturd orbicnlari. 



The tied Littorina. Shell globosely turbinated, thin, 

 ventricose, spirally densely elevately striated, olive 

 or reddish-chestnut, sometimes encircled with inter- 

 rupted yellowish bands; whorls rounded; aperture 

 orbicular. 



Turbo obligaius, Say, Journ. Acad. Nat. Sci. Philadelphia, 

 vol. ii. p. 241. 



Littorina rudis, Gould. 



Hab. Maine, United States. 



A light, turbinated shell, mostly of a bright reddish- 

 chestnut colour, more or less freckled with yellowish 

 interrupted bands. 



Species 99. (Mus. Cuming.) 



Littorina millegrana. Litt. testd ovato-conoided, ven- 

 tricosd, acuta, albidd; anfractihus convexis, spiraliter 

 dense grano-liratis ; aperturd suborbicnlari, carneo-fus- 

 cescente. 



The thousand-grained Littorina. Shell ovately 

 conoid, ventricose, sharp, whitish ; whorls convex, 

 spirally densely grain-ridged ; aperture nearly orbicu- 

 lar, flesh-brown. 



Philippi, Abbild. und Besch. Conch, vol. iii. p. 65. pi. 7. 

 f. 15. 



Hab. Red Sea. 



Allied to the group figured in Plate II., of which L. di- 



latata is the type. 



Species 100. (]\Ius. Cuming.) 



Littorina Mauritian a. Litt. testd ovato-conicd, solidd, 

 ccei-ulescente-albd, transversim tenuissime striatd; an- 

 fraetibus parum convexis, ultimo subangulato ; aper- 

 turd purpureo-fuscd, fascid solitarid albd basalt. 



The Mauritius Littorina. Shell ovately conical, 

 solid, bluish-white, transversely very finely striated ; 

 whorls but little convex, the last slightly angled; 

 aperture purple-brown, with a solitary white band at 

 the base. 



Phasianella Mauritiana, Lamarck, Anim. sans vert. vol. ii. 

 p. 244. 

 Littorina unifasciata, Gray. 



Hab. Mauritius. New Holland. 



Distinguished by its solid, sharply conical form, and 



peculiarity of colouring. 



