M Y T I L U S. 



Species 6. (Mus. Cuming.) 



Mytii.us tortus. Myt. teda pyriformi-ovaUt, concen- 

 Irice striata, striis peculiariter oblique, decmsatis, latere 

 postico lata, pecidiariter contorto ; niteute-castaued, 

 epidermide fibrosa barbatd. 



The twisted Mytilu.s. Shell pyrifoniily ovate, con- 

 centrically striated, striae obliquely decussated, poste- 

 rior side broad, peculiarly distorted ; shining-chest- 

 nut, bearded with a fibrous epidermis. 



DuNCKKit, Pro. Zool. Soc. 185f). /^f< J" 



Hab. Island of Mindanao, I'liilippines ; Cuming. 



This tine species, with its handsome bearded epidermis, 



is peculiarly distinguished by its strangely twisted growth. 



Species 7. (Mus. Cuming.) 



-Mvni.us llAMATUS. Myt. testa arcuato-jyriformi, sub- 

 quadratd, antice late inipressd, striis elevatis divari- 

 catis valide sculptd ; oUvaceo-virente. 



The hooked Mytilus. Shell arcuately pyriform, some- 

 what square, anteriorly broadly impressed, strongly 

 sculptured with divaricated raised striie ; olive-green. 



S.\Y, Journ. Acad. Nat. Sci. vol. ii. p. 265. American 

 Conchology, pi. 50. 

 Mytilus striatus, Eaines. 



Hab. Gulf of Mexico. 



A shell of stout substance, sculptured throughout with 



very strongly developed thick-set divaricating ridges. 



Species S. (Mus. Cuming.) 

 Mytills hirsutus. Myt. testa arcuato-oUongd, postice 



hrmiter oblnse amjulatu, antice latlisimd et gibbusd, 

 medio hiante, louyitiiditialiter dense elevato-striatd ; 

 nitente-castaned, epidermide fibrosa barbatd. 



The hatey Mytilus. Shell arcuately oblong, poste- 

 riorly shortly obtusely angled, antei'iorly very broad 

 and gibbous, gaping in the middle, longitudinally 

 densely elevately striated ; shining-chestnut, bearded 

 with a fibrous epidermis. 



Lamarck, Amin. sans vert. vol. vii. p. 38. 



Hab. New Zeah.nd. 



Triangular, curved, and very gibbous on the posterior 



side, with the valves gaping ratlitr largely for the passage 



of the byssus. 



Species 9. (Mus. Cuming.) 



Mytilus horuidus. Myt. testd pyriformi-ovatd, latere 

 postico iiupresso-ciirvato, conceutrice striatd, striis 

 obliijui decitssatis; niteute-castaned, epidermide fibrosa 

 barbatd. 

 The horrid Mytilus. Shell pyriformly ovate, poste- 

 rior side inipressly curved, concentrically striated, 

 strise obliquely decussated ; bright-chestnut, bearded 

 with a fibrous epidermis. 

 DuNcKER, Pro. Zool. Soc, 1856. 

 Ilab. Cape Capricorn, North Australia ; Macgillivray. 



Very closely allied to M. tortus, figured above it, but of 

 a more truly pyriform curve, and destitute of any indica- 

 tion of the curious posterior distortion which is constant 

 in that species. 



