12 THE NAUTILUS. 



Aperostoma dysoni (Pfr.) 



Ampullaria sp. (young). 



Helicina amoena Pfr. 



Thysanophora plagioptycha (Shuttl.) 



Thysanophora cockerellae n. sp. 



Opeas micra (Orb.) 



Euglandina cumingi (Beck.) 



Caecilioides consobrina veracruzensis (C. and F.) 



Succinea sp. (immature). 



Aplexa princeps Phillips. 



Thysanophora cockerellae n. sp. PI. I, figs. 5, 6. 



Related to T. conspurcatella, hornii etc. The spire is conic, com- 

 posed of nearly 4^ very strongly convex whorls united by a very 

 deep suture, the last whorl regularly rounded, rather coarsely striate. 

 Umbilicus contained 3^ times in the diameter. Aperture subcir- 

 cular, about one-fifth of the circumference occupied by the preceding 

 whorl. 



Alt. 2.4, diam. 3.4 mm. 



Quirigua, Guatemala, W. P. Cockerell, 1912. 



The spire is decidedly higher than in T. conspurcatella Morel. 

 It is nearer T. proxima Pils., from the state of Michoacan which agrees 

 in size of umbilicus, but the spire is higher in T. cockerellce. T. 

 fischeri Pils. is a more delicate shell with narrow umbilicus. Seven 

 specimens were collected, the largest being measured above and fig- 

 ured. Most of the lot are decidely smaller with 4 whorls. The 

 surface is not in good condition, but will probably prove to have 

 cuticular processes like those of the related species mentioned. 



It is named for Mrs. Cockerell. 



NOTES. 



Bermuda Shells — Mr. Arthur Haycock presented to the Acad- 

 emy of Natural Sciences of Philadelphia a set of shells from Whitby 

 Cave, Bermuda, including Strohilops huhhardi Br., Zonitoides bris- 

 toll Gul., Thysanophora hypolepta Shutt., Bifidaria rupicola Say, 

 and Striatura milium meridionalis Pils. The Striatura is new to 

 the Bermuda fauna. — E. G. Vanatta. 



Errata. — February number, page 110, end of sixteenth line from 

 bottom, for " the rows " read two rows. 



