MYTILUS 



Species 36. (Mus. Cuming.) 



Mytilus angustands. Myt. testa angude oblongd, gib- 

 hosiusculd, nmbonibus subconiractis, tumidis, margari- 

 taceis, lavibus, exire7nitate concenirice striata, fidvo- 

 fmcd, rotundatd. 



The narrow Mytilus. Shell narrowly oblong, rather 

 gibbous, umboes somewhat contracted, swollen, 

 pearly, smooth, extremity concentrically striated, 

 fulvous-brown, rounded. 



Lamakck, Anim. sans vert. vol. vii. p. 1(5. 



Hub. Valparaiso. 



Distinguished by its narrow prolonged growth, par- 



taking somewhat of Modiola 



form. 



Species 37. (Mns. Cuming.) 

 Mytilus tenuistkiatus. Myt. lestd trigono-oblongd, 

 subcurvatd, postice gibbosd, antice compresse angulatd, 

 radiatini dense striata, striis medio plus minus obsolc- 

 tis ; olicaceo-fuscd, circa umbones alba, purpurascente 

 tittctd. 

 The pinely-sthiated Mytilus. Shell triangularly ob- 

 long, rather curved, posteriorly gibbous, anteriorly 

 comprcssly angled, radiately densely striated, striaj 

 more or less obsolete in tlie middle; olive-brown, 

 white, tinged with purple around the umboes. 

 DiiNKEK, MS. Mus. Cuming. 



Hab. ? 



A shell of light substance, pui-ple-brown in colour, 

 closely rayed with striae, which commence on the umboes, 

 and then become obsolete, reappearing more strongly de- 

 veloped at the margin. 



Species 38. (Mus. Cuming.) 



Mytilus Morrisi. Myt. testd anguste curvatd, versus 

 umbones gibbosd, postice pecuUarifer concavd, undique 

 radiatim sulcata, liris angustis, hie ilUc bifurcatis ; 

 cairuleo-nigrd. 



Morris's Mytilus. Shell narrowly curved, gibbous 

 towards the umboes, posteriorly peculiarly concave, 

 everywhere radiately grooved, ridges narrow, here 

 and there bifurcated ; blue-black. 



DuNKER, Pro. Zool. Soc. 1856, p. 3G0. 



Hab. Guinea. 



A narrow, peculiarly curved shell, bifurcately grooved 



and ridged after the manner of M. Nicobaricus. 



Species 39. (Mus. Cuming.) 

 Mytilus Galloprovincialis. Myt. testd oblongd, pos- 

 tice subdepressd, gibbosd, antice compresse dilatatd, 

 undique lavi, cceruleo-nigrd, nitente. 



The Provence Mytilus. Shell oblong, posteriorly ra- 

 ther depressed, gibbous, anteriorly compressly di- 

 lated, everywhere smooth, shining, blue-black. 

 Lamarck, Anim. sans vert. vol. vii. p. 46. 

 Hab. Shores of Provence, Mediterranean. 



This species may be nothing more than a local modifi- 

 cation of M. edulis ; it is, however, peculiarly compressly 

 dilated on the anterior side. 



Fig. -10. (Mus. Cuming.) 

 The shell here represented, Mytilus Kraussii, Kuster, is 

 a characteristic orange-red variety of M. Nicobaricus, of 

 which species the dark bronze-green state, described and 

 figured at Sp. 43, is the type. 



Species -l-l. (Mus. Cuming.) 

 Mytilus bifurcatus. Myt. testd trigo?io-ovatd, postice 

 depressd, valdt' gibbosd, undique late conspicue sulcata, 

 sulcis hie dlic bifurcatis, liris obtuse granulatis ; in- 

 tense ceeruleo-nigrd. 

 The bifurcated Mytilus. Siiell triangularly ovate, 

 posteriorly depressed, very gibbous, everywhere con- 

 spicuously grooved, grooves here and there bifurcated, 

 ridges obtusely granuled ; deep blue-black. 

 Co.NKAD, Journ. Acad. Nat. Sci. Philadelphia, vol. vii. pi. 

 241. 

 A very .strongly grooved species, of a dark indigo blue- 

 black colour. 



Species 42. (Mus. Cuming.) 

 Mytilus Nicobaricus. lifyt. testd stibquadrato-oblongd, 

 crassiusculd, postice late concavo-depressd, valde gib- 

 bosd, ad umbones rostratd, antice Jlextwso-compressd, 

 undique dense sulcata, liris granulato-serratis, hie 

 illic bifurcatis ; intense cteruleo-viridi. 

 The Nicobau Mytilus. Shell somewhat squarely ob- 

 long, rather thick, posteriorly broadly concavely de- 

 pressed, very gibbous, beaked at the umboes, ante- 

 riorly flexuosely compressed, everywhere densely 

 grooved, the ridges being granulately serrated, and 

 here and there bifurcated; deep blue-green. 

 Chem.mtz, Conch. Cab. vol. viii. p. 155-1 .57. pi. 82. f. 



73G a, b, and 737 nos. 2 and 3. 

 Mytilus bilocularis, Lamarck. 



Tichogonia bilocularis, Wiegman. 

 Septifer bilocularis, Dunker. 

 Hab. Eastern Archipelago, 



A characteristic densely-grooved species, of dark bronze- 

 green colour, chambered within the umboes. 



January, 1857. 



