70 THE NAUTILUS. 



the Field and Viveash ranches in the canon of the Pecos River, New 

 Mexico. The specimen is to be referred to thomsoniana proper, 

 having the basal tooth simple, but it is the smallest on record for 

 that species; diam. max. 11^, min. a scant 10, alt. 6^; whorls 4^. 

 Should this small size and number of whorls prove constant in the 

 locality, the snail would I think deserve to be separated as a race. — 



T. D. A. COCKERELL. 



The Genera Cryptogirasia and Cryptosoma. In the 

 Fauna of British India, Mollusca (vol. I, 1908), p. 203, Godwin- 

 Austen adopts the generic name Cryptogirasia, crediting it to 

 " Cockerell, A. M. N. H. (6) vii, 1891, p. 99 (no description)." 

 The name Cryptogirasia was a manuscript one of mine, dating from 

 1891 ; but as a matter of fact it was printed in the plural form 

 (^Cryptogirasia) in the place cited. It was not wholly without 

 description ; this and the other genera and groups of " Helicarionince, 

 sens, lat." were defined by a table. From the standpoint of generic 

 nomenclature, Cryptogirasia must date from 1908, when it was 

 adopted and defined by Godwin-Austen. The other genera credited 

 to me in the same work were published in the correct form, either 

 in P. Z. S. or Nautilus. They were defined in the table cited. 

 Cryptosoma Theobald, 1857, applied to an oriental genus of the 

 same family, is a homonym of the earlier Cryptosoma Brull^, used 

 for a genus of crabs of the family Calappid«. I have not found the 

 exact date of Brull^'s genus, but it is not later than 1848. The 

 Molluscan Cryptosoma may take the name Mg-gaustenia; type 

 Megaustenia prcestans (^Vitrina prcsstans Gould, 1843). 



T. A. Cockerell. 



Unio (Nodularia) Putzeysi new name for U. (^Nodidaria) 



suhnigra Preston Mr. Bryant Walker having pointed out to me 



that the name ^' subnigra" used by me (Ann. Mag. Nat. Hist., 

 London, Ser. 9, vol. IV, 1909, p. 89) for a species of Unio from the 

 Lower Belgian Congo is preoccupied, I now propose to substitute 

 for this the name " Putzeysi " in honour of Dr. S. Putzeys of 

 Brussels, whose work on the land and fresh- water molluscan fauna 

 of the Belgian Congo is well known to every student of the con- 

 chology of that region. — H. B. Preston. 



