LIST OF PLATES. XXXJii 



854. Sea SnailH, Periwinkles, Drills, ami Borers 099 



Fie. 1. I. mnitia herot. Se> Uepori I . S. l'i-li Commission. I';irt I, p. 700. 



I'n:. _'. I'lir/iura Iniiilliii. See Keport U. 8. Fish Commission. Part I, p. 698. 



Kit!. :!. r<iri>ur<i l<ti>illu*. bamicd variety. 



lit.. I. .\in-iiln iliijiliiiila. See KYport I". S. I 'ish Commission. Parti, p. 700. 



In,. .".. lli/ananaobuoleta. See Bcport U. S. Fish Commission. Partl,p.696. 



l'n;. i'. I'filiii Iririllalii. 



1'iii. 7. The Whelk, Hun-iHum undatum. See Report U. 8. Fish Commission. Parti, p.C99. 



1'iii. f. The Periwinkle, Fulgrr carica. See Report U. 8. Fiuli Commission. Part I, p. (594. 



FIG. 9. AnlyrittoHiilii. 



FlO. Id. .l-tiiri* In mil, i. 



Km. 11. Kitnoa aciileatiii. 



I'm. 12. The Drill or Borer, Uronalpinx cinerta, p. 697. 



855. ViiiioiiM speeies of r hi HIM 703 



FlO. 1. .lii'inlun /CHIT. 



A i.hmil reduced ono-bnlf. 8e Report 17. S. FUh Commission. Part I, p. 877. 



FIG. 2. The Long Clam, Soft Clam, or Mnnninnsr, Mya arenaria. 



With amin:il in extrusion, reduced to one-half the natural ilze. 



FIG. 3. Tagelus gilbu*. 



With animal, the siphon not fully extended. One-half natural size. See Keport U. S. Fiah Commission. Parti, p. 875. 



FlO. 4. The Razor Clam, Entatctla amrricana. See Report U. S. Fish Commission. Port I, p. 707. 



With animal extended. One-half natural sise. 

 FIG. 5. Shows some of the terminal papilla- enlarged. 



FiG.C. The Razor Clam, Ensatella americana. 



Shrll Natural size. 

 FIG. 7. The Ship Worm, Teredo narali$. 



Enlarged two diameters. 

 FlG. 8. The Scallop, Pecten irradians. See Report U. S. Fish Commission. Part I, p. 709. 



Natural aize. 

 FlG. 9. The Bloody Clam, Argina pexata. 



-Natural ize. 



256. Various species of clams 703 



FIG. 1. The Qnahang or Little-necked Clam, Venus mercenaria. 



Natural aize. 

 FlG. 2. The Quahaug of Puget Sound, Saxidomut Nuttalli. 



Natural size of large specimen. Drawn by ,T. II. Euierlon. 

 FIG. a. The Gaper Clam of the West Coast, Schizotharut \ultalli (Conrad). 



(I.) Specimeu of ordinary size, reduced about one-fourth in hnglb. The siphon* are somewhat contracted ; the foot (F) 



expands about aa usual. 

 (II.) Outline of the left valve of a larger specimen, reduced to the same extent. Drawn from nature by K. E. C. Stearns. 



257. TheGeoduck, or Giant Clam of the Pacific, Glycimerii generota 70S 



Natural size; specimens with siphons partly contracted; weight when alive, 6J pounds. Drawn by K. E. C. Stearni. 



258. Mussels and Sea Clams '09 



FlG. 1. The Beach Clam or Hen Clam, Spisula tolidunintn. See Report U. S. Fish Commission. Parti, p. 708. 



Natural size. 



FlG. 2. The Sea Clam, Cyprtna Mandica. 



Natural size. 



FlO. 3. The Black Mussel, Mytilus edulis. See Report U. 8. Fish Commission. Port I, p. 709. 

 FIG. 4. The Black HOI-M- Mussel, Modiola tiiyra. 



FlG. 5. The Rough Mnssrl, .Vodiola plicatula. See Report U. 8. Fish Commission. Part I, p. 709. 

 FIG. 6. The Ho:-*- Mussel. Mndiuli maiJiotitt. See Report U. S. Fish Commission. Part I, p. 709. 



259. The anatomy of the oyster. (See opposite page for full explanation) 711 



260. FIG. 1. The Rock Crab, Cancer trroralus Say ; male one-half natural size 766 



FIG. 2. Zoea of the same, in tbo Inst stage hefore it changes to the megalops condition; lateral view, 



enlarged seventeen diameters. 

 FIG. 3. Megalops stage of the same, just after the change from the zoe'a condition; dorsal view, enlarged 



thirteen diameters. 



FlO. 4. The Jonah Crab, Cancer lorealis Stimpson ; male, two-thirds natural size 769 



FIGS. 5, 6. Terminal joints of the big claws of the same, viewed from the outer side, natural size. 

 Drawings by J. H. Emerton. 



261. The Common Crab of the Pacific Coast, Cancer ntagitter Dana; male, somewhat smaller than natural size. . 770 



Drawing by H. L. Todd. from No. 2533, TT. S. National Museum. California, William Stimpson. 



