LIST OF PLATES XIX 



Page. 



254. Sea Snails, Periwinkles, Drills, and Borers 693 



Fig. \. Lunatia heros. Seo Rcjiort U. S. Fish Commission. Parti, p. 700. 



Fig. 2. rurjmmlapillas. See Report U. S. Fish Commission. Parti, p.C98. 



Fig. 3. Purpura lapillus, lianued variety. 



Fig. 4. Neveriia dupUcata. See Eeport U. S. Fish Commission. Part I, p. 700. 



Fig. 5. Iliianassa obsoleta. See Report U. S. Fish Commission. Part I, p. 696. 



Fig. C. TrUia triviltata. 



Fig. 7 . The WirnYk, Buccinum midatum. See Report U. S. Fish Commission. Parti, p. 699. 



Fig. 8. The Periwinkle, fu^fffc c-arica. See Report U. S. Fish Commission. Parti, p. 694. 



Fig. 9. Astyria zonalis. 



Fig. 10. Astijris lunala. 



Fig. 11. Ilissoa aoulcaius. 



Fig. 12. The Drill or Borer, Urosalpinr t))ierrii. ]\C07. 



255. Varions species of clams 703 



Fig. 1. Ani/uhis tener. 



Anim;il reduced one-lialf. See Keport U. S. Fish Commission. Part I, p. 677. 

 Fig. 2. The Long Clam, Soft Clam, or Maiiuinose, Mya arenaria. 



"With animal iu extension, redueed to one-balf the natural size. 

 Fig. 3. Tagelus gihbun. 



"With animal, the siphon not fully extended. One-half natural size. See Keport U. S. Fish Commission. Parti, p. 675. 

 Fig. 4, The Razor Clam, Enaaiella americana. See Report U. S. Fish Commission. Part I, p. 707. 



With animal extended. One-half natural size. 

 Fig. 5. Shows some of the terminal papillaj enlarged. 



Fig. 6. The Razor Clam, EnsateVa americana. 



Shell. Natural size. 

 Fig. 7. The Ship Worm, Teredo navuUs. 



Enlarged two diameters. 



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



Natural size. 

 Fig. 9. The Bloody Clam, Argina pexala. 



Natural size. 



256. Various species of clams 703 



Fig. 1. The Qnahaug or Little-ueckod Clam, Venus mercenaria. 



Natural size. 



Fig. 2. The Qiiahang of Puget Sound, Saxidomus NuttaUi. 



Natural size of larjxo specimen. Drawn by -J. H. Emerton. 

 Fig. 'i. The Gaper Clam of the West Coast, ScliizothCBrus SiMaUi (Conrad). 



(I.) Specimen of ordinary size, reduced ahout one-fourth in length. The siphons are somewhat contracted; the foot (F) 



expands about as usual. 

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



257. The Geoduck, or Giant Clam of the Pacilic, Glyei'itcris generosa 708 



Natural size ; specimens with siphons partly contracted ; weight when alive, G^ pounds. Drawn by H. E. C. Stearns. 



258. Mussels and Sea Clams 709 



Fig. 1. The Beach Clam or Hen Clam, Spisula solidissima. See Report U. S. Fish Commission. Part I, p. 708. 



Natural size. 



Fig. 2. The Sea Clam, Ci/prina islandica. 

 Natural size. 



Fig. 3. The Black Mussel, Mgtnus edulis. See Eeport U. S. Fish Commission. Part I, p. 709. 

 Fig. 4. The Black Horse Mussel, ilodlola nigra. 



Fig. 5. The Rough Mnssel, -ITodio^a p^icaiH^a. See Report U. S. Fish Commission. Part I, p. 709. 

 Fig. 6. The Horse Mussel, Modinla modiolus. See Report XJ. 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 irroratus Say ; male one-half natural size 766 



Fig. 2. Zoea of the same, in the last stage before it changes to the megalops condition ; lateral view, 



enlarged seventeen diameters. 

 Fig. 3. Megalops stage of the same, just after the change from the zoea condition; dorsal view, enlarged 



thirteen diameters. 



Fig. 4. The Jonah Crab, Cancer horealis 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 vwgister Dana; male, somewhat smaller than natural size. . 770 



Drawing by H. L- Todd, from No. 2553, XJ. S. National Museum. California, William Stimpson. 



