EPIPHKAGMOPHORA. 197 



and lateral teeth without side cusps ; marginals tricuspid ; dart bi- 

 angulate; mucus glands as in Epiphragmophora. Type E. farrisi, 

 pi. 58, figs. 58, 59. See also E. petasensis, pi. 58, figs. 60, 61. 



We regret to say that this group is not well distinguished from 

 the preceding. 



Section ANGRANDIELLA Anc. Shell depressed, umbilicated, with 

 a toothlike prominence within the basal lip, marked by an external 

 pit. Type E. angrandi, pi. 58, fig. 57. 



** Central American and Mexican forms. 



Section AVERELLIA Ancey. Shell discoidal with concave spire 

 and wide umbilicus, hirsute, the last whorl deeply descending in 

 front ; scrobiculate behind the aperture above and below ; aperture 

 subhorizontal, biplicate within, peristome narrowly expanded. Type 

 E. macneili Crosse. 



Section TRICHODISCINA Martens. Shell depressed, with open 

 umbilicus and deflexed last whorl, granulate and hairy; aperture 

 small, oblique or subhorizontal, toothless, the lip expanded. Jaw 

 ribbed (pi. 52, fig. 17, E. cordovana). Type E. coactiliata, pi. 58, 

 figs. 70, 71. 



### North American forms. 



Section MICRARIONTA Ancey. Shell globose or globose depressed, 

 one or many banded, the bands sometimes interrupted ; substance 

 rather calcareous. Mucus glands two, with threadlike ducts, one 

 lengthened, adherent to and spread upon the vagina or base of 

 penis, its duct entering vagina at root of dart sack; the other 

 shorter, usually adherent to dart sack, on base of which its duct 

 enters. Radula with rather short basal plate and wide niesocones, 

 no ectocones on middle and lateral teeth. Marginals with a sub- 

 bifid inner and simple outer cusp (pi. 60, fig. 4, areolata). See 

 pi. 59, figs. 89, E. areolata. Type E. facta gabbi, pi. 58, figs. 73, 

 74. (See also E. areolata, pi. 58, figs. 66, 67.) 



Section HELMINTHOGLYPTA Ancey. Shell globose or depressed, 

 its surface either simply striated, decussated or malleated. Mucus 

 gland one, split into two bulb-bearing branches, and inserted on the 

 dart sack. (PI. 59, fig. 47, E. arrosa; fig. 87, E. traskii v. cayama- 

 censis; fig. 88, E. nickliniana). Radula with basal plates longer 

 than cusps of median teeth, middle and lateral teeth without side 



