IXPLANATION OF PLATE XXX, 
FIGURE 217.—Tagelus gibbus, (p. 675;) natural size. 
218.—Tagelus divisus, (p. 676;) natural size. 
219.—Callista convexa, (p. 681;) natural size. 
220.—Tottenia gemma, (p. 682;) enlarged. 
221.—Cumingia tellinoides, (p. 679;) natural size. 
222.—Macoma fragilis, var. fusca, (p. 676;) natural size. 
223.—Angulus tener, (p. 677 ;) natural size. 
224.—Anegulus 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.—Scapharca transversa, (p. 691 ;) natural size. 
229.—Nucula delphinodonta, (p. 691;) enlarged. 
230.—Nucula proxima, (p. 691;) natural size. 
231.—Yoldia sapotilla, (p. 6&9 ;) natural size. 
232.—Yoldia limatula, (p. 689;) natural size. 
(Figure 224 was drawa by A. E. Verrill; the rest are from Binney’s Gould, by E.S. Morse.) 
