110 THE NAUTILUS. 



Habitat, North River, Alabama, near Tynes. Examples may be 

 seen in the National Museum and in the cabinet of Mr. W. A. 

 Marsh, of Aledo, Illinois, and in my own. Thirty specimens re- 

 ceived. The shell is allied distinctly to instructus Lea, and also to 

 rubellus Conrad, and to froschelianus Lea. Some of them remind 

 one offassinans Lea. 



From rubellus Conrad it may be distinguished by being longer, not 

 so stout or inflated. It need not be confounded with the other shells 

 named, as it differs from them entirely, although allied. It is named 

 for the collector. Figured specimens are deposited in coll. Acad. Nat. 

 Sci., Phila. 



SPECIES OF CHLOKOSTOMA OF SOUTHERN AND EASTERN PATAGONIA. 



BY HENRY A. PILSBRY. 



The genus Chlorostoma is essentially Pacific, being chiefly devel- 

 oped upon the Pacific shores of Asia and North and South America. 

 The former open strait between the Americas allowed it to spread to 

 the Antillean region and eastern shores of the United States, where 

 a number of species have existed from the tertiaries to the present 

 time. A few forms also found their way around Cape Horn. The 

 species have been generally divided between two genera, Ompha- 

 lius, including the umbilicate forms; but this division is purely arti- 

 ficial and unnatural, very closely allied species being separated by it. 

 It would be better to drop Omphalius into the rubbish-heap of syn- 

 onymy. The etymology of Chlorostoma, " green mouth," is not very 

 appropriate to most of the species. 



There are no species of the genus known from European or Afri- 

 can seas. On the eastern coast of South America, south of Brazil, 

 the following occur : 

 Cblorostoma patagonicum (Orbigny). 



Trocltus patagonicus Orb., Voy. dans 1'Air.^r. Mend., Mollusques, 

 p. 408, pi. 55, f. 1-4 (1835-1846). 



Trochus corrugatus Koch in Philippi, Abbild. u. Beschreib, etc., 

 I, Trochits, pi. 2, f. 7 (Nov., 1843). 



This species was found by d' Orbigny in the Bay of San Bias, 

 Patagonia ; Philippi gives the locality Brazil. Dr. A\ r m. H. Rush 

 collected a few specimens in Maldonado Bay, Uruguay. The sculp- 



