70 PROCEEDINGS OF THE ACADEMY OF [1898. 



No further details of the genitalia are needed except such as are 

 clearly shown in the figures; and of course some variation in the 

 absolute dimensions of various organs is to be expected. 



Details are lacking to intercalate the other species of the sub- 

 genus in the above synopsis, but from Binney's figures it seems that 

 E. Kelletti and Tryoni fall into § bb. of the first division (a.) of this 

 dichotomous table, and it is likely that E. ruficincta and facta group 

 in the second division, aa. They differ from E. Guadalupiana Dall 

 in having the dart sack well developed. The position of the eye 

 retractor muscle is unknown. Neither of them has a diverticulum 

 on the spermatheca duct. 



E.Stearnsiuna differs considerably from areolata, Pandorce, Veitchii 

 and, according to Binney's figures, Kelletti, in having the diverticulum 

 short or obsolete. Two specimens were dissected, both from Coro- 

 nado Islands. In one (66,091 A. N. S. P. Mus., coll. by A. W. 

 Anthony) there is no trace of a diverticulum. In the other (69,014, 

 from Prof. W. H. Dall) there is a very short diverticulum, about 

 1 mm. long, arising slightly beyond the lower fourth of the length 

 of spermatheca duct. In this specimen the duct is 8 mm. shorter 

 than in the other. Binney's figure shows a somewhat longer diver- 

 ticulum than our No. 69,014, but it is still very short. This variation 

 in the diverticulum is exactly paralleled in the European Helix 

 pomatia. 



EXPLANATION OF PLATE I. 



Note. — The shells of the specimens furnishing the genitalia 

 figured, as well as the dissections, may be found in the collection of 

 the Academy bearing numbers corresponding to those given below. 



(Div., diverticulum of the spermatheca duct. d. s., dart sack. 

 Jl., flagellum. m. gl. as., ascending mucous gland, m. gl. des., de- 

 scending ditto, p., penis, r. p., penis retractor muscle, ^..sper- 

 matheca. sp. d., duct of the spermatheca. t., talon, vag., vagina). 



Fig. 1. Glyplostoma Newberryanum (W. G. B.). Pasadena, Cal. 



No. 68,997. 

 Fig. 2. Epijihragmophora Veitchii (Newc). Cerros Is., of Lower 



Cal. No. 69,647. 

 Fig. 3. The same individual, other side of the dart sac and adjacent 



organs. 

 Fig. 4, 5. Ep ip hragmophora Pandora 3 , Bonitosensis Pils. Las 



Bonitos Is., off Lower California. No. 66,092. 



