M Y T I L U S . 



PLATE Xr. 



Species 53. (Mus. Cuming.) 



Mytilus Cumingianus. Myt. leUd trigono-Jlahellatii, 

 valde gibbosd, postice late subconcavo-impressd, nndiqw; 

 radiaiim dense granoso-Uratd, Uris versus marymem 

 plus minus diclmtomu ; pellucido-lutescente, riifo et 

 vivide virescente variegatd. 



Cuming's Mytilus. Shell triangularly fan-shaped, very 

 gibbous, posteriorly broadly somewhat coucavely im- 

 pressed, radiately densely granosely ridged through- 

 out, ridges more or less dichotomous towards the 

 margin ; transparent-yellow, variegated with red and 

 bright-green. 



Recluz, MS. in Mus. Cuming. 



Hab. Panama. 



A conve.v gibbously-eompressed shell, prettily varie- 

 gated with red or bright-green upon a light semitranspa- 

 rent ground. 



Species 53. (Mus. Cuming.) 



Mytilus curvatus. Myt. testd anbtrigond, soUduld, 

 valde arcuatd, postice peculiariter impressd, v.mboni- 

 bus subrostraiis ; fusco-corned, costidis diclwlomis ra- 

 diatd. 



The curved Mytilus. Shell somewhat triangular, ra- 

 ther solid, very much arched, posteriorly peculiariy 

 impressed, umboes rather beaked ; brownish-horny, 

 rayed with fine dichotomous ribs. 



Du.N-KER, Pro. Zool. Soc. 1856. 



Hab. Island of Luzon, Philippines ; Cuming. 



A short curved shell, curiously compressed, or pinched, 



as it were, beneath the umboes in the vicinity of the byssal 



orifice. 



Species 54. (Mus. Cuming.) 



JIytilus Lavalleanus. Myt. testd oblongd, Modioli- 

 formi, valde gibbosd et tumidd, latere postico subtus 

 impresso, radiatim obsolete sulcatd ; castaneo-fuscd. 



Lavalle's Mytilus. Shell oblong, l/o(/«o/a-shaped, 

 very gibbous and swollen, posterior side impressed 

 beneath, radiately obsoletely grooved ; chestnut- 

 brown. 



D'Orbigny, Moll, de Cuba. 



Hab. Cuba. 



A short, swollen, gibbous species, partaking very much 

 of the character of Modiola. 



Species 55. (Mus. Cuming.) 

 Mytilus Adamsianus. Myt. testd ovato-trigond, valde 

 gibbosd, postice plano-compressd, ad umbones attenitulo- 

 rostratd, antice fiabellatd, undique nitide Jlexuoso-cos- 

 tellatd, costelUs granulato-serratis, versus marginem 

 dichotomis ; olivaced, nigra tinctd. 

 Adams's Mytilus. Shell ovately triangular, very gib- 

 bous, posteriorly flatly compressed, attenuately beaked 

 at the umboes, fan-.shaped anteriorly, everywhere 

 neatly flexuously ribbed, ribs granularly serrated, 

 dichotomous towards the margin ; olive, tinged with 

 black. 

 DuNKER, Pro. Zool. Soc. 185G, p. 300. 

 Hab. Panama; Cuming. 



A very pretty species, rayed throughout with finely ser- 

 rated flexuous dichotomous riblets. 



56. (Mus. Cuming.) 



Mytilus minimus. Myt. testd trigono-oblotigd, postice 

 gibbosd et concavo-impressd, utrinque subacute angu- 

 latd, dense conceiUrice striata ; albidd, fusco-piir- 

 pureo tinctd. 



The VERY SMALL Mytilus. Shell triangularly oblong, 

 posteriorly gibbous and concavely impressed, rather 

 sharply angled on each side, densely concentrically 

 striated ; whitish, stained with fuscous-purple. 



PoLi, Test. utr. Sicil. vol. ii. pi. 32. f. 1. 



Hab. Mediterranean. 



An unusually sharply-angled species, densely eoncentri 



cally striated, and darkly stained with fuscous-purple. 



Species 57. (Mus. Cuming.) 



Mytilus cubitus. Myt. testd Irigono-oblongd, subcur- 

 vatd, postice obtuse gibbosd, impressd, undique radia- 

 tim granoso-Uratd ; ulivaceo-luted. 



TuE COUCH Mytilus. Shell triangularly oblong, some- 

 what curved, posteriorly obtusely gibbous, impressed, 

 radiately gi'anularly ridged ; olive-yellow. 



Say, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 263. 



January, 1858. 



