196 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



PLATE LV. 



FIG. 1. Tellina tenera Say, showing extended animal. 



2. Mya arenaria Linne", showing extended animal. 



3. Tagelus gibbus Spongier, showing extended animal. 



4. Ensis americanus Gould, showing extended animal. 



5. The same, terminal siphonal papillse. 



6. Teredo navalis Linue*, removed from burrow, showing external soft parts, 



shell, and pallets. 



7. Venus mercenaria Linne", showing extended animal. 



These figures were loaued by the U. S. Fish Commission. They first appeared in 

 the first Annual Report of the Commission in Prof. A. E. Verrill's report on the 

 invertebrate animals of Vineyard Sound, and were drawn from life by Professor 

 Verrill. 



PLATE LVI. 



FIG. 1. Yoldia limatula Say. 



2. Area transvertsa Say. 



3. Tagelua gibbus Spongier. 



4. Nucula proximo, Say. 



5. Tagelus divisus Spengler. 



6. Macoma baltica Linne", var./wsca Adams. 



7. Kellia planulata Stimpson, enlarged about twice nat. size. 



8. Nucula delphinodonta Migbels, enlarged to about twice nat. size. 



9. Yoldia sapotilla Gould. 



10. Macoma tenta Say, typical form. 



11. Gemma purpurea H. C. Lea (G. gemma Totten), identified from Lea's T/ype. 



12. Tellina tenella Verrill. 



13. Tellina tenera Say. 



14. Cumingia tellinoides Conrad. 



15. Cytherea convtxa Say. 



16. Area (Argina) pexata Say. 



For remarks see note under Plate L. Fig. 12 was drawn by Prof. A. E. VerrilL 



PLATE LVII. 



FIG. 1. Cyprina islandica Linn6. 



2. Mactra solidissima Dillwyn. 

 For remarks see note under Plate L. 



PLATE LVIII. 



FIG. 1. Aslarte undata Gould. 



2. Cryptodon Gouldii Philippi. 



3. Solenomya velum Say. 



4. Astarte quadrans Gould, Long Island Sound northward to Nova Scotia. 



5. Cardium pinnulatum Conrad. 



6. Divaricella dentata Wood. 



7. Aatarte castanea Say. 



8. Liocardium Mortoni Conrad, showing extended animal. 



9. Fenericardia borealis Conrad, typical form. 



10. Venericardia borealis var. novanglice Morse. 



11. Eriphyla lunulata Conrad, enlarged. 



12. Cryptodon obesus Verrill, greatly enlarged. 



13. Eriphyla lunulata Conrad, natural size. 



14. Lucina filosa Stimpson. 



See Plate L for remarks. Figures 1, 11, and 12 were drawn by Prof. A. E. Verril). 



