M 1) 1 O L A . 



Plate HI. 



(Mus. Cuming.) 

 jDlOL.v I'LICATULA. Mod. tesld mbtrigono-obloHgd, pos- 



iice impresso-cnrvatd, antice lonffiiiidinalUer productd 

 et flabellatim dilatatd, midique dense mlcald, liris, iti- 

 fermediis mbplmmlatis, caitaneo-nigrd, oUvaceo-hdeo 

 fiiictd. 

 Till! PLICATED MoDiOLA. Shell somewhat triangularly 

 oblong, posteriorly impressly curved, anteriorly lon- 

 gitudinally produced and fan-like dilated, everywhere 

 closely grooved, the intermediate ridges being rather 

 ilat, chestnut-black, tinged with olive-yellow. 

 Lamakck, Anira. sans vert. vol. vii. p. 22. 

 Myliltts demissus, Dillwyn. 

 MytiliiS pUcatulus, Deshayea, 

 Hah. United States. 



An oblong gibbous species, closely sculptured through- 

 out with flattened ridges, excavately grooved in the inter- 

 stiees. 



Species 9. (Fig. 9 and 10, Mus. Cuming.) 

 MoDU)l,.\ BAKBAT.\. Mod. leslu, Iriyono-Jlabelliformi, 

 subcompressd, concentrice nitide Jih-striatd, vivide cas- 

 (aned, piiis setaeeia versus marginem dense barbatd. 

 The bearded Modiola. Shell triangularly fan-shaped, 

 rather compressed, concentrically neatly thread-stri- 

 ated, bright chestnut, densely bearded towards the 

 niarpin with bristlv hairs. 



Lamarck, Anim. sans vert. vol. vii. p. 22. 



Mytilus barbuliis, Liuna;us. 



Mytilus modiolus, Brooks. 

 Hab. Seas of Europe. 



A fan-shaped compressed species, partaking very mucli 

 nf the character of ifytiius, densely covered with a stifl 

 bristly b.'ard. 



Species 11. (Mus. Cuming.) 



Modiola capax. Mod. testa oblonga, subarcvatd, postice 

 late impressd, valde gibbosd, antice dedivi-compressd, 

 margine svperue obtuse angulato ; intense castaned, ver- 

 sus marginem pilis setaceis sparsim barbatd. 



Thf, spacious Modiola. Shell oblong, slightly arched, 

 posteriorly broadly impressed, very gibbous, ante- 

 riorly slopingly compressed, margin obtusely angled 

 towards the upper part; dark chestnut, sparingly 

 bearded towards the margin with bristly hairs. 



Conrad, Journ. .\cad. Nat. Sei. Philadelphia, vol. vii. p. 

 242. 



Jfab. Galapagos Islands ; Cuming. California ; Nuttall. 

 Mazatlan ; Carpenter. 



This chiefly differs from the preceding species in having 

 more the typical form of the genus, more oblong and gib- 

 bous, with the anterior margin more slopingly produced. 

 It a])pears also to be less densely bearded. 



