130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



species is "Aehnlich S. crocata A. Gould von den Samoa-Inseln und 

 modesta A. Gould von den Samoa-und Tonga-Inseln, aber etwas 

 schmaler und das Gewinde noch stumpfer, knopfformig." 



One of the specimens of Succinea submitted to Dall by Biolley was 

 stated to have " 'a more depressed spire, much lighter color, smaller 

 coil, proportionately wider aperture, and the surface quite regularly, 

 minutely ribbed.' " Biolley listed this form as Succinea sp., but stated 

 that if it is found to be new in the future, he would propose the name 

 Succinea dalli. In view of the variability of members of this genus, we 

 hesitate to recognize the species on the evidence available. 



Opeas gracile (Hutton) 



Bulimus gracile Hutton, Jour. Asiatic Soc. Bengal, vol. 3, 1834, pp. 

 84, 93. 



Bulimus junceus Gould, Proc. Boston Soc. Nat. Hist., vol. 2, Dec. 



1846, p. 191. "Hab. Society and Sandwich Islands." U.S. 



Explor. Exped., vol. 12, 1852, p. 76, Atlas, Moll, k Shells, 

 1856, pi. 6, figs. 87, 87a. "Inhabits Tahiti and Eimeo." 



Opeas junceum (Gould), von Martens, Sitz. Ges. Naturf. Freunde zu 



Berlin, Jahrg. 1898, no. 9, p. 156. Cocos Island. Kobelt, 



Nach. Deutsch. Malalc. G^s., Jahrg. 31, 1899, p. 26. von 



Martens, Sitz. Ges. Naturf. Freunde zu Berlin, Jahrg. 1902, 



no. 3, p. 61. Ancey, Journ. de Conchyl., vol. 51, no. 2, 



1903, p. 102. Cocos Island. Also Polynesia. Biolley, Mol- 



lusques de L'lsla del Coco. Mus. Nac. de Costa Rica. 1907, 

 p. 17. Wafer Bay, Cocos Island. 



Opeas juncea (Gould), Dall, Proc. Acad. Nat. Sci. Philadelphia, vol. 

 52, 1900, p. 96. Cocos Island. 



Opeas gracile (Hutton), Pilsbry, Man. Conch., ser. 2, vol. 18, 1906, 

 pp. 125-132, 188, 198-200, pi. 18, figs. 3-6; pi. 22, fig. 6; pi. 

 28, figs. 70, 71. "India, type locality." Generally distributed 

 throughout the tropics including America. 



Von Martens first listed O. junceum (Gould) from Cocos Island 

 and was followed by Dall and Ancey. Pilsbiy (1906, p. 131) has 

 shown that the name "was based upon the small Polynesian race of 

 gracile." He also reduced many other names to synonomy and showed 



