EXPLANATION OF PLATE XXX. 



FiGURp; 217. — Tagelus gibbus, (p. 675 ;) natural size. 

 218. — Tegelus divisus, (p. 676 ;) natural size. 

 219. — Callista convexa, (p. 681 ;) natural size. 

 220.— Tottenia gemma, (p. 682;) enlarged. 

 221.— Cumiugia tellinoides, (p. 679;) natural size. 

 222. — Macoma fragilis, var. fusca, (p. 676;) natural size. 

 223. — Augulus tener, (p. 677 ;) natural size. 

 224.— Angulus tenellus, (p. 677;) natural size. 

 225. — Tellina tenta, (p. 678;) natural size. 

 226.— Kellia planulata, (p. 688 ;) enlarged. 

 227.— Argina pexata, (p. 692 ;) natural size. 

 228.— Scapliarca transversa, (p. 691 ;) natural size. 

 229.— Nucula delphinodonta, (p. 691 ;) enlarged. 

 230.— Nucula prosima, (p. 691 ;) natural size. 

 231.— Yoldia sapotilla, (p. 689;) natural size. 

 232.— Yoldia limatula, (p. 689 ;) natural size. 



(Figure 224 was drawn by A. E. Verrill ; the rest are from Binney'a Gould, by E. S. Morse.) 



