50 Smith and Harger — St. George's Banks Dr edgings. 



Astarte undata Gould. 



VerriD, American Journal of Science, III, vol. iii, pp. 213, 287, 1872; and Report 

 on the Invertebrate Animals of Vineyard Sound, in Report of U. S. Commissioner 

 of Fish and Fisheries, part I, 1873, p. 384, pi. 29, fig. 203, 1874. 



Plate I, figures 6 to 9. 



The figures given in Gould's works are scarcely characteristic of 

 this, the most abundant species of the northern coast of New England, 

 and we here publish several figures, prepared by Professor Verrill, 

 which more fully illustrate the different forms of the species. The 

 name undata was proposed by Gould for a form of his Astarte sid- 

 cata. 



Astarte lens Stimpson. 



Astarte crebricostata G-ould, Invertebrata of Massachusetts, 2d edition, edited by 



Binney, p. 126, fig. 440, 1870 (not of Forbes, teste Verrill). 

 Astarte lens Stimpson, MS., Gould, op. cit., p. 127 ; Verrill, American Journal of 



Science, III, vol. iii, pp. 213, 287, 1872. 



Plate I, figures 4 and 5, 

 This species seems to be more exclusively a deep-water form than 

 the last, although the specimens dredged by us at the localities {g, o, 

 and s) mentioned are all much smaller than the common form of the 

 species in the Bay of Fuiuly, and may well be regarded as a dwarf 

 variety. 



Pecten pustuloSUS VerriU. 



American Journal of Science, III, vol. v, 1873, p. 14 (December, 1872). 



Upper valve more convex than the lower, a little swollen toward 

 the umbo ; length and breadth nearly equal, the margin diverging 

 nearly at right angles from the beak to the middle of the anterior and 

 posterior borders, on each of which tliere is an obtuse angle, from 

 which the outline of the ventral margin forms a regular curve, nearly 

 semicircular, but a little produced ventrally ; the surface with about 

 14 radiating rows of relatively large, prominent, round, hollow vesi- 

 cles, those in the middle rows nearly hemispherical, while part of 

 those of the lateral ones ai"e subconical and smaller ; seven or eight 

 of the rows are first developed, at a short distance from the apex of 

 the shell, the other ones afterward coming in between the primary 

 ones ; the rows are distant in the middle and more crowded together 

 toward the borders; between the rows of vesicles the surface is 

 marked by distant, fine, impressed grooves, which pass between and 

 separate the vesicles ; on the umbos, above the origin of the vesicles, 

 the border of the groove rises into a thin, slightly elevated lamella. 

 Lower valve with fine, close, slightly raised, concentric lamellae, be- 



