ibS CALIFORNIA ACADEMY OF SCIENCES. 



SucciNEA cALiFORNicA Crossc and Fischer. 



This form was founded on specimens obtained near 

 where Orcutt obtained those identified as S. oregonensis 

 Lea, in Lower California, lat. 31°. Those found by 

 others near Cape St. Lucas seemed to me to be nearer 

 the S . rtisticana Gould, perhaps a var. of last. Some of 

 the latter had undulations more or less strongly marked, 

 but they were not constant, and I did not consider them 

 specific characters. It seems, however, that there is a S . 

 undulata Say, from Mexico, probably from Acapulco. 

 Those brought from Tepic are without undulations, and 

 seem to me identical with S. oregonensis, while I cannot 

 see any difference in the figures of S . californica C. & 

 F. If the same, Say's name is prior to Lea's, but seems 

 founded on an abnormal character, and not tenable. 



Tebennophorus sallei C. & F. 



Two specimens brought from Tepic are considered by 

 Dr. Dall as probably this species. 



Vaginulus moreleti C. & F. 



One found at Tepic, and is said to be found also in 

 Central America. Although somewhat contracted in al- 

 cohol, it is very similar to the figure of the living animal 

 given by the authors, measuring about i^ inches long 

 and 0.6 wide. 



LiMN^EA columella Say. 



Five specimens from Tepic cannot be distinguished as 

 species from the typical form as figured by W. G. Bin- 

 ney in Land and Fresh Water Shells, part ii, p. 33, ex- 

 cept that the largest is only about half the size of the 

 northern shells. I believe it has not before been reported, 

 from Mexico. According to Binney, the Succinea wil- 

 soni Lea, of Georgia, and S . ^elhicida Lea, are forms of 

 this Limnea, but to avoid the chance of a mistake, I ex- 



