T1IK NAUTILUS. 1 29 



to size, shape, relative size and prominence of the leaks, stria; ami 

 appearance of the surface, color, transluceney or opacity of the 

 shell. Some of the full-grown examples are straw-colored all over, 

 others horn or arayish with a broad or narrow light zone along the 

 margins. None of the different forms can be regarded and described 

 as typical and the others as varietal since they are connected by in- 

 tergradations. In younger specimens, the superior margin is gener- 

 ally less curved, the anterior and posterior more so than in the adult. 

 The rugosity of the inner surface of the shell is like that of Pis, nnv- 

 eboracense, although microscopical, much coarser than e. g. in P. 

 variabile Pr. and compression Pr. 



Pis. atlanlicum seems nearest related to P. noveboracense, but the 

 mussel is shorter, its posterior part comparatively higher, the supero- 

 anterior slope is steeper and the color is different. 



SOME NOTES ON BERMUDIAN MOLLUSKS. 



BY OWEN BRYANT. 



Dr. Pilsbry, in his article on " The Air-breathing Molhisks of the 

 Bermudas " in Transactions of the Connecticut Academy (Vol. X, 

 part 2, p. 493, Sept., 1900) says: ''From the data supplied by Prof. 

 Verrill's expedition and that of Prof. Heilprin, it seems that Val- 

 lonia pulchella, Gecilioides acicula, Agriolimax laevis and Physa a cut a 

 rest upon single records now nearly twenty years old, and they may 

 not have permanently colonized ; but as none of them are conspicu- 

 ous forms, and no special collectors of land shells have sought for 

 them, the merely negative evidence is inconclusive." 



In this connection it is interesting to note that Physa acuta Drap., 

 was found by Mr. Davis and recorded in the NAUTILUS (Vol. 

 XVII, p. 125, Mar., 1904). Gecilioides acicula Mull, and Vnl- 

 lania pulchella Mull, were found by Mr. Addison Gulick and myself 

 on the grounds of the Hotel Frascati, while studying at the Ber- 

 muda Biological Station in July and August, 1903. A careful 

 search would very likely reveal Agriolimax laevis Miill. 



Vallonia pulchella (Miill.). 

 First recorded by Jones, 187G. (The Visitor's Guide to Her- 



