71 



7. bifurcatus, Conr. 



8. borealis, Lam. 



9. Califomianus, Conr. 



10. Charpentieri, Dunk. 



11. Cliiloensis, Phil. 



12. cochleatus, Kickx. 



13. compressus, P/«7. 



14. crassus, Bunk. 



15. cubitus, #tfy. 



16. Cumingianus, RecL 



17. cruciformis, Reeve. 



18. curvatus, Dunk. 



19. Domingensis, ^ec^. 



20. Dunkeri, Reeve. 



21. edulis, ZzVm. 



22. excisus, TFi'ey. 



23. exustus, Lam. 



24. Galloprovincialis, Zaw. 41. 



25. glomeratus, Gould. 42. 



26. gracilis, Reeve. 43. 



27. granulatus, ZZaftZ. 44. 



28. Grunerianus, Dunk. 45. 



29. hamatus, Sffy. 46. 



30. hirsutus, Lam. 47. 



31. horridus, Dunk. 48. 



32. latus, Lam. 49. 



33. Lavalleanus, D'Orb. 50. 



34. Magellanicus, Chemn. 51. 



35. Menkeanus, PM. 52. 



36. minimus, PoZi. 53. 



37. Morchianus, Reel. 54. 



38. Morrisij Dunk. 55. 



39. Nicobaricus, Chemn. 56. 



40. obesus, Dunk. 



obscurus, Dunk. 

 ovalis, Lam. 

 pallio-punctatus, Dunk. 

 Pema, Linn. 

 pilosus, Recluz. 

 polymorplius, Pallas. 

 Kossmasleri, Reel. 

 rostratus, Dunk. 

 Sallei, Reel. 

 sinuatus, Dunk. 

 smaragdinus, Chemn. 

 tenebrosus, Reeve. 

 tenuistriatus, Dunk. 

 tortus, id. 

 ungulatus, Linn. 

 ustulatus, Lam. 



Figure. 



Mytilus horridus. PI. 29. Fig. 171. Shell, showing its elongated fan- 

 shaped growth, and hairy fringe-like epidermis. 



Genus 3. MODIOLA, Lamarck. 



Animal ; oblong ; mantle marc/ins closed anteriorly, open behind, 

 sometimes forming puckered branchial lips and a produced anal 

 tube ; foot narrow, ligulate ; byssal gland more or less cylin- 

 drical. 



Shell ; oblong, equivalve, more or less ventricose ; wnboes small, 

 rather swollen, not terminal, anterior side often expanded, pos- 

 terior arched, contracted ; hinge linear, with the ligament mar- 

 ginal and partially internal. 



Naturalists are not all agreed upon the propriety of separating Modiola 



dually thrust out, until at length the elongation was earned to the desired extent, sometimes 

 to fully two inches. It was now employed in feeling or testing all the objects within reach, directed 

 to the right or to the left, backwards or forwards. After all this prelude, to ascertain apparently 

 the security of the intended holdings, the point of the foot is settled and retained for a short 

 time on the chosen spot, when it is again suddenly removed and immediately withdrawn entirely 

 within the shell, leaving behind a thread that reaches from the spot to the base of the foot. By 

 many repetitions of this operation, carried on patiently clay after day (for not above four or five 

 threads are spun in the twenty-four hours), and by attaching the disk-like extremities of the 

 threads to different places, the mussel at last completes its cable and secures a safe anchorage." 

 — Johnston, Introd. Conch, p. 143. 



