68 U.S. NATIONAL MUSEUM BULLETIN 239 



diademata 'Agassiz' Gould, Doris: 1870, Invert. Massachusetts, 

 p. 230, pi. 21, figs. 298, 300-304 (Boston and Beverly Harbors 

 [Massachusetts], L. Agassiz), length 1%, breadth nearly 1 in. 



diaphana 'Couthouy' Gould, Bulla: 1852, USEE, vol. 12, p. 222, 

 pi. 15, fig. 265, a-d (drawn up in shrimp nets near the mouth of the 

 harbor of Rio de Janeiro [Brazil]); length % in.; not in 1862, Otia 

 Conch. 



diatretum, Cyclostoma [Cyclotus]: 1847, PBSNH, vol. 2, p. 205 

 (Sandalwood Bay [Vanua Levu Island], Feejee [Fiji] Islands, 

 Drayton), lat. %, alt. % in.; 1852, USEE, vol. 12, p. 105, pi. 8, 

 fig. 124,a-b; 1862, Otia Conch., p. 38. Measured holotype USNM 

 5525, figured slightly enlarged. 



dilatatus, Planorbis: 1841, Invert. Massachusetts, p. 210, fig. 140 

 (Nantucket, J. M. Earle; Hingham [Massachusetts], in small pool, 

 southeast of Old Colony House, T. J. Whittemore), diam. % 0) axis 

 y 20 in. Mentioned as being in Massachusetts State Cabinet 75 and 

 BSNH 2399 but both specimens lost; 1862, Otia Conch., p. 182; 

 1870, Invert. Massachusetts, p. 498, fig. 748. 3 syntypes MCZ 

 225216 ex C. B. Adams coll. labeled "Hingham, Mass." 



dilecta, Gena Plate 20, fig. 9 



1859, PBSNH, vol. 7, p. 44 (Hakodadi [Hakodate] Bay [Japan], on 

 shells, etc., W. Stimpson), long. 8, lat. 4 mm.; 1862, Otia Conch., 

 p. 109. Measured holotype USNM 1695; paratype USNM 24130; 

 paratype MCZ 169549 ex NYSM, reduced to fragments; paratype 

 Redpath Mus. 1747 ex Smithsonian Inst. NPEE. 



dilecta, Gouldia Plate 29, fig. 4 



1861, PBSNH, vol. 8, p. 32 (Kagos[h]ima [Japan], W. Stimpson, 

 long, et alt. 4, lat. 2 mm.; 1862, Otia Conch., p. 170. Half measured 

 holotype USNM 64077, original no. 1694. NPEE. 



dilecta, Natica [Neverita]: 1848, PBSNH, vol. 3, p. 73 (hab.?), 

 long. %, lat. % in.; 1852, USEE, vol. 12, p. 213, pi. 15, fig. 255,a 

 (probably obtained at mouth of Rio Negro, Patagonia [Argentina]); 



1862, Otia Conch., pp. 50, 244. 



dilectus, Conus: 1850, PBSNH, vol. 3, p. 172 (Feejee [Fiji] Islands), 

 long. K, lat. Kin.; 1852, USEE, vol. 12, p. 286, pi. 21, fig. 367,a; 

 1862, Otia Conch., p. 73 Figured holotype USNM 5762. 



discoidea, Ostrea: 1850, PBSNH, vol. 3, p. 347 (hab.?), long. 

 IK, lat. 2 in.; 1852, USEE, vol. 12, p. 463, pi. 44, fig. 578,a-b; 

 1856, ibid., Addenda and Corrigenda, p. 509: "By some chance a 

 wrong shell seems to have been figured at 578"; 1862, Otia Conch., 

 p. 97. Figured holotype USNM 5961, fig. 578a-b; paratype MCZ 

 178589 ex BSNH 8528 (variety); paratype MCZ 178594 ex Smith- 

 sonian Inst, (printed label). 



