134 THE NAUTILUS. 



H. & A. Adams as a possible field for type selection, Leiostraca 

 metcalfei A. Adams is the only one that meets the full charac. 

 terization of their genus, all the others being members of the 

 genus StrombiJ'omiis Da Costa, 1778. 



Unfortunately, Albers, in his Die Heliceen, p. 156, 1850, used 

 the name Leiostracus, which was considered homonymous with 

 H. & A. Adams' Leiostraca by Monterosato in his paper on 

 Nomenclatura Generica e Specifica di alcune Conchiglie Medi- 

 terranee, p. 103, 1884, where he published the substitute name 

 Subularia with the statement ^^ {=^ Leiostraca, H. e A. Adams, 

 1853, non Leiostracus Albers, 1850)." Subularia metcalfei (A. 

 Adams) therefore became the type of Subularia Monterosato. 



The whole may be condensed into the following formula: 



Subularia M.oniQ. , 1884, type Subularia metcalfei (A. Ads. ) = 

 Leiostraca H. & A. Adams 1853, type Leiostraca metcalfei A. 

 Ads. ; not Leiostracus Albers 1850. 



Since Subularia and Strombiformis have been sadly confused in 

 the past, I add a copy of a figure of the type of Subularia (pi. 5, 

 fig. 2), and of a typical Strombiformis (pi. 5, fig. 1, Strombi- 

 formis lapazana Bartsch). 



A NEW PLEISTOCENE MOLLUSK LOCALITY IN NEW MEXICO. 



BY JUNIUS HENDERSON. 



In the spring of 1916 Dr. Max M. Ellis, with Messrs. G. C. 

 Roe and B. Jaffa as assistants, while collecting fishes in New 

 Mexico, found a deposit containing many small land and fresh- 

 water shells. It is in the bank of the North Spring River, 

 about two and a half miles below (east of) Roswell. The valley 

 was evidently at one time deeper than now, but had been partly 

 filled by mud, sand and fine gravel. More recently the stream 

 has cut into the deposit to a depth of fifteen feet. The thick 

 fossiliferous stratum is at the base of the bluff, extending into 

 the water and possibly far below, and is covered by about ten 

 feet of soil, chiefly adobe. Twenty pounds of the weathered 

 material yielded (in addition to abundant fragments of Chara 

 and other plants, a few fragments of mammal bones and 400 

 caddis cases of the genus Helicopsyche) the following mullusks : 



