EXPLANATION OF PLATE XXIX. 



FIGURE 203. Astarte uudata, (p. 084;) somewhat reduced. 

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

 205. Astarte quadraus, (p. 685;) natural size. 

 206. Gouldia mactracea, (p. 685;) natural size. 

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

 208. Loevicardium 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. Lucina filosa, (p. 686;) natural size. 

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

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

 215. Cyclocardia Nbvanglice, (p. 684;) natural size. 

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



(Figures 203, 207, 214 &quot;were drawn by A. E. Ten-ill : 215 by E. S. Morse ; the rest from Binney s Gould, 

 and mostly drawn by E. S. Morse.) 



