6 THE NAUTILUS. 



LIST OF MOLLUSKS COLLECTED IN MALDONADO BAY, URUGUAY, BY 



DR. WM. H. RUSH, U. S. N. 



BY HENRY A. PILSBRY. 



In the NAUTILUS for September, 1896, a list maybe found of the 

 non-marine mollusca collected in Uruguay and Argentine Republic 

 by Dr. Rush. Descriptions of the new species mentioned in that 

 paper have been published in subsequent numbers, and in the Pro- 

 ceedings of the Academy of Natural Sciences of Philadelphia for 

 1896, pp. 360-365, and plates 26, 27, and Manual of Conchology, 

 2d ser., Vol. XI. 



The marine shells obtained by him while with the South Atlantic 

 Squadron were nearly all taken in MaldonadoBay, dredged in from 

 three to six fathoms of water, the limpets, etc., from the shore ex- 

 cepted. The few forms collected elsewhere than at Maldouado and 

 vicinity have the localities indicated below. In this connection it 

 may be mentioned that the squids which jumped aboard the Yantic, 

 as described by Dr. Rush in NAUTILUS, VI, p. 82, turn out to be 

 Ommastrephes Bartramii. Among the forms enumerated below and 

 in the several published lists of shells from this general region, it is 

 somewhat remarkable that some groups usually rather numerous, 

 such as Rissoidce, are not represented. The occurrence of a number 

 of northern species is also noteworthy. There are also in the series 

 collected about a dozen forms found only in poor condition and not 

 yet identified. The descriptions of new species will shortly appear, 

 with figures, in Proc. Acad. Nat. Sci. Phila. 



GASTROPODA. 



Acmcea onycliina Gould. Gorritti Island, Maldonado Bay. This 

 bay was the type locality of Patella mulleri Dkr., a synonym of 

 Gould's species. 



Bittiwm sp. 



Ballia cochlidium Kien. 



Bidlia globulosa Kien. Maldonado Bay. Very heavily cal- 

 loused fossil specimens occurred in the wall of fort at the Mus. La 

 Plata, Argentine Republic. 



Bullia Uruguayensis n. sp. Shell somewhat like B. globulosa 

 Kn., but more slender, the spire much longer. Surface smooth ex- 

 cept for two to four spiral impressed lines separated by convex low 

 cords, just below the impressed suture, and fine spiral stride on the 



