SANGUINOLARIA. 



Genus SANGUINOLAEIA, Lamarck. 



Testa ovato-iramversa, convexiuscula, smpe peUiccida, ina- 

 quilaieralis, ienumime concenlrice striata, plerumque 

 plus mhrns sangidmo-rosea, latere aniico rotundato, 

 postico plus minus attenualo-producto, impressione 

 Jkxuosd ab umboniins ad marginem radiante. Cardo 

 dentibtts duobus parvis eredis subbifidis approxi-matis 

 in utrdque valvd. Impressio muscularis pallii sinn 

 Irigono fate ventrali. 

 Shell ovately transverse, rather convex, mostly transparent, 

 inequilateral, very finely concentrically striated, gene- 

 rally more or less blood-rose, anterior side rounded, 

 posterior more or less attenuately produced, with a 

 flexuous impression radiating from the umboes to the 

 margin. Hinge with two small erect sub-bifid teeth, 

 approximating, in each valve. Muscular impression 

 of the mantle with a broadly ventral triangular sinus. 

 Of the two species which Lamarck included under this 

 generic head only one, SanguinoLaria rosea (Solen sangui- 

 nokntiis, Gmelin), remains. To this are added in the ac- 

 companying Plate four other species of characteristic typi- 

 cal resemblance, one described by Mr. Arthur Adams in 

 the ' Proceedings of the Zoological Society ' for 1849, two 

 described by M. Deshayes in the same journal for 1854, 

 and one which is apparently new. They differ little from 

 each other in form* or texture; and the colouring, where 

 any exists, though of a different intensity in each species, 

 is of the same uniform tone. The anterior side of the 

 shell in each species is regularly rounded, and the posterior 

 more or less attenuated or beaked, and characterized by a 

 faint depression radiating across the posterior area from 

 the umbo on each side to the margin. 



The habitats of the species, so far as they are known, 

 are Ceylon, Central America, and California. 



Species 1. (Mus. Cuming.) 



Sanguinol.^uia vitrea. Sang, testa ovato-transversa, 

 convexiuscula, inaquilateraU, tenui, Candida, vitrea, 

 tenuissime et irregulariter striata, latere antico bre- 

 viore, circulari, postico superne recto, vix declivi, ex- 

 tremitate angustato, margine inferiore valde convexo. 



The glassy Sanguinolakia. Shell ovately transverse, 



rather convex, inequilateral, thin, white, glassy, very 



finely and irregularly striated, anterior side shortei', 



March 



cii'cular, posterior straight at the upper part, a little 

 sloping, narrowed jit the extremity, lower margin 

 very convex. 



Deshayes, Pro. Zool. Soc. 1854, p. 336. 



Hab. ? 



This sheD is of rather firm texture, though perfectly 



transparent, without any tinge of the delicate sanguineous 



rose-colour which characterizes the other species of the 



genus. 



Species 3. (Mus. Cuming.) 



Sanguinolakia ovalis. Sang, testa ovato-transversd, 

 convexiuscula, mbaquilaterali, tenui, minutissime de- 

 cussation striata, albidd, pitrpureo-roseo dilute tinctd, 

 latere antico late rotundato, postico subobtuse atteom- 

 ato, vuirgine inferiori convexo. 



The oval Sanguinolakia. Shell ovately transverse, 

 rather convex, nearly equilateral, thin, very minutely 

 decussately striated, whitish, dilutely tinged witii 

 purple-rose, anterior side broadly rounded, posterior 

 side rather obtusely attenuated, lower margin convex. 



Hab. Central America. 



This little species is chiefly distinguished by its convex 



swollen growth about the umboes. 



Species 3. (Mus. Cuming.) 

 Sanguikolaria Tellinoides. Sang, testa subaugusle 

 transversa, inaquilaterali, tenuiculd, minute decussa- 

 fmi striata, intense pellucido-rosed, latere antico hi- 

 tiore, rotundato, postico ab VMJbonibus jlexuoso-impres- 

 so, ad extremitatem attenuato-rostrato. 

 The Tellina-like Sanguinolakia. Shell rather nar- 

 rowly transverse, inequilateral, rather thin, minutely 

 decussately striated, deep transparent rose, anterior 

 side broader, rounded, posterior flexuously impressed 

 from the umboes, attenuately beaked at the extre- 

 mity. 

 Adams, Pro. Zool. Soc. 1849, p. 170. pi. 6. f. G. 

 Hab. Gulf of California. 



A pretty transparent rose-coloured species, with a flex- 

 uous depression sloping from the umbo to the margin on 

 the posterior side, which is somewhat attenuately beaked 

 at the extremity. 



1857. 



