68 PROCEEDINGS OF THE ACADEMY OF [1898. 



ora, Lysinoe, Leptarionta, Cepolis, and Polymita are all more nearly 

 allied to each other than to Ghjptostoma? 



The lack of mucus glands is a degenerative feature unique in Be- 

 logona Euadenia, though it occurs in the Belogona Siphonadenia. 



The high insertion of the dart sack is very unusual. 



The talon is longer than in any other Helix known to us. 



The loss of a flagellum on the penis is unique among American 

 Euadenioz, but occurs in certain Chinese forms of Eulota and in 

 many other Old World groups. It is not usually a character of 

 generic importance in Helices. 



The Micrarionta group of Epiphragmophora. 



Micrarionta was proposed by Mr. C. F. Ancey as a subgenus of 

 Helix, based mainly, it would seem, upon the small size of the shell 

 and reflexed lip of its type, H. facta. In the " Guide to the Study 

 of Helices" the group was expanded to include the larger, simple- 

 lipped Lower Californian Helices which Binney (following von 

 Martens) referred to Euparypha; and it was shown to have well 

 marked anatomical features unlike any other known group of 

 Helices. 



The three subgeneric groups iuto which our West Coast Epiphr- 

 agmophoras were divided in the " Guide," — Micrarionta, Helmintho- 

 glypta and Monadenia, — differ trenchantly in the forms of their 

 mucus glands. In the first they are inserted by two separate ducts 

 at the base of, rather than upon, the dart sack. In the second a 

 single duct enters the dart sack, and splits into two bulbiferous 

 branches above. In the third there is a single club-shaped gland. 

 The other characters of the soft anatomy, as well as the shells, are 

 not very unlike in the three groups. 



Of the eleven species of Micrarionta, E. intercisa and E. levis are 

 unknown anatomically. E. Gabbi, rvficincta, intercisa, Kelletti and 

 Tryoni are known to us by W. G. Binney's figures, but several char- 

 acters being unnoticed by Binney, a reexamination of these is desir- 

 able. We have dissected E. areolata, Pandorce, Veitchii, Stearnsiana 

 and Guadalupiana. 



E. Guadalupiana Dall, PI. I, fig. 11 (genitalia) differs consider- 

 ably from the other species examined. The flagellum is but little 



2 Leptarionta is hardly sufficiently known to be included in this statement. 

 It should be stated that the shell characters of Glyptostoma are also notably 

 different from any of the other genera named. 



