118 U.S. NATIONAL MUSEUM BULLETIN 23 9 



obstricta, Bulla [Cylichna]: 1839, Silliman's Amer. Journ. Sci., 

 ser. 1, vol. 38, p. 196 (Chelsea Beach, A. A. Gould; Provincetown, 

 Col. Totten; New Bedford, C. B. Adams [all in Massachusetts]), 

 long. 0.2, lat. 0.1 in.; 1841, Invert. Massachusetts, p. 167, fig. 96. 

 Mentioned as being in Massachusetts State Cabinet no. 113 and 

 BSNH 2389 but both specimens lost; 1862, Otia Conch., p. 180; 

 1870, Invert. Massachusetts, p. 219, as a synonym of Utriculus 

 canaliculatus Say. 10 syntypes MCZ 216773 ex C. B. Adams 

 coll. from New Bedford, Massachusetts. 



obtusa, Odostomia Plate 19, fig. 4 



1861, PBSNH, vol. 7, p. 405 (Port Lloyd, Bonin Islands, W. 

 Stimpson), axis 24-, diam. 1 mm.; 1862, Otia Conch., p. 149. Meas- 

 ured holotype USNM 950. NPEE. 



obtusa, Theora: 1861, PBSNH, vol. 8, p. 24 (hab.?), long. 10, 

 alt. 6, lat. 3 mm.; 1862, Otia Conch., p. 162: "Only one valve was 

 obtained." Half holotype USNM 24060, original no. 1420, not 

 found. NPEE. 



obtusa, Yoldia: 1861, PBSNH, vol. 8, p. 36 (Hong Kong Harbor 

 [China], in mud, 6-10 fathoms, W. Stimpson), long. 16, alt. 9, 

 lat. 6 mm.; 1862, Otia Conch., p. 175. NPEE. 



occidens, Fisurella: 1846, PBSNH, vol. 2, p. 156 (Callao, Peru), 

 long. 1%, lat. lKo, alt. % in.; 1852, USEE, vol. 12, p. 364, pi. 31, 

 fig. 473,a-b; 1862, Otia Conch., p. 13. Figured holotype USNM 

 5863; 2 paratypes MCZ 155766 ex Smithsonian Inst, (printed 

 label). 



ocellatus, Elenchus Plate 14, fig. 9 



1861, PBSNH, vol. 8, p. 18 (Sydney, New South Wales [Australia], 

 W. Stimpson), axis 12, diam. 7 mm.; 1862, Otia Conch., p. 156. 

 Measured holotype USNM 24206, original no. 300. 



olivaceus, Limax: 1852, USEE, vol. 12, p. 4, pi. 1, fig. 3,a-b 

 (Par[r]amatta, New South Wales [Australia], J. P. Couthouy), 

 long. 2K in.; 1862, Otia Conch., p. 223. 



ollula, Limnaea Plate 43, fig. 6 



1859, PBSNH, vol. 7, p. 40 (streams and marshes on Hong Kong 

 Island [China], Wright), axis }{, diam. }{ in.; 1862, Otia Conch., 

 p. 105. Lectotype, here selected, USNM 831, figured by Yen, 

 1944, Proc. California Acad. Sci., ser. 4, vol. 23, p. 580, pi. 51, 

 figs. 42, 50. NPEE. 



onychina, Lottia [Tectura]: 1852, USEE, vol. 12, p. 355, pi. 30, 

 fig. 461,a-b (marked Rio [de] Janeiro [Brazil], "but they so much 

 resemble shells from the Pacific coast, I think there must be some 

 mistake"), length %, breadth % height }{ in.; 1862, Otia Conch., 

 pp. 226, 242. Figured holotype USNM 5825; lot also includes 



