THE NAUTILUS. 

 A NEW RISSOA FROM BERMUDA. 



65 



BY E. G. VANATTA. 



RiSSOA (NODULUS) STEWARDSONI, n. Sp. Fig 1. 



The shell is very minute, slightly rimate, thin, pale yellowish 

 corneous, smooth, slender, regularly tapering from the last whorl to 

 the very obtuse summit. Whorls 4^, moderately convex. Aper- 

 ture semi-rotund, subvertical, the peristome continuous, inner margin 

 nearly straight, the outer regularly curved. Length 1.5, diam. 6.5, 

 length aperture .55 mm. 



Types No. 99041, A. N. S. P., from Fairyland, near Hamilton, 

 Bermuda, near the shore, collected by Mr. Stewardson Brown, asso- 

 ciated with Melampus coffea and Jlavus, Leuconia occidentalis Ptr., 

 Blauneria, Alexia, Detracia, Pedipes, Oarychium, CcBcilioides, Biji- 

 daria, Thysanophora, Polygyra microdonta, and many other land 

 shells. 



Fig. 1. 



Fig. 2. 



This tiny snail has the appearance of the terrestrial genus Acme. 

 It is apparently a shore shell, as it was not found with any typically 

 marine forms. It seems to be most closely related to the Medi- 

 teranean and Adriatic R. epidaurica Brusina, from which it differs 

 by the more slender contour, more tapering spire and more convex 

 whorls." R. epidaurica is decidedly more' cylindrical. For com- 

 parison a figure is given (fig. 2) of a specimen of R. epidaurica re- 

 ceived from Professor Brusina, from Ragusa, Dalmatia (No. 59,- 

 898 A. N. S. P.) R. glahrata Muhlf. is more conical than 

 stewardsoni, with the aperture more rounded. 



