EXPLANATION OF PLATE XXIX. 



Figure 203. — Astarto uudata, (p. 684 5) somewhat reduced. 

 204. — Astarte castanea, (p. 685;) natural size. 

 205. — Astarte quadrans, (p. 685;) natural size. 

 206. — Gouldia rnactracea, (p. 685 ;) natural size. 

 207. — The same, inside of one valve, enlarged. 

 208. — Laevicardium. Mortoni, (p. 683;) natural size, with animal. 

 209. — Cardium pinnulatum, (p. 683;) natural size. 

 210. — Solenomya velum, (p. 688;) natural size. 

 211. — Cyclas dentata, (p. 686 ;) natural size. 

 212. — Lncina filosa, (p. 686;) natural size. 

 213. — Cryptodon Gouldii, (p. 686;) enlarged two diameters. 

 214. — Cryptodon ohesus, (p. 687 ;) enlarged three diameters. 

 215. — Cyclocardia Novanglia?, (p. 684;) natural size. 

 216. — Cyclocardia borealis, (p. 683;) natural size. 



(Figures 203, 207, 214 were drawn by A. E. Verrill ; 215 by E. S. Morse : the rest from Binney's Gould, 

 and mostly drawn by E. S. Morse.) 



