Ortmann — Invertebrate Fossils from Patagonia. 381 



24. Volutagraciliorv. Ihering. The specific name gracilior 

 was introduced by v. Ihering in 1896 (Nachrichtsblatt Deutsch. 

 Malakozool. Ges.) for V. gracilis Phil, (non Lea). It is impos- 

 sible for me to distinguish from this species V. quemadensis 

 v. Iher. The living V. philippiana Dall (1890) is different. 



25. Voluta domeykoana Phil. V. pilsbryi v. Iher. (1899) 

 does not seem to be different from this species. 



26. Pleurotoma subcequalis Sow. What v. Ihering calls, in 

 1899, bj the name of PL discors Sow. seems to belong to this 

 species. 



27. Pleurotoma unifascialis v. Ihering. This species has 

 been regarded by v. Ihering (1897) as a variety of P. discors, 

 but I think it is a good species. 



28. Geryon (?) peruvianus (d'Orb.). Cancer patagonicus 

 Philippi is apparently the same species as Carcinus peruvianus 

 A. Milne Edwards (Ann. Sci. Nat., ser. 4, vol. xiv, 1860, p. 

 269). I do not think, however, that it is a Carcinus. It may 

 belong to Geryon. 



Princeton University, May, 1900. 



