HYGROMIA. 277 



Genitalia (pi. 70, fig. 37, H. noverca) ; penis short and stout, con- 

 tinued in a long epiphallus bearing the retractor, and ending in a 

 long flagellum. Spermatheca oval on a moderately long, unbranched 

 duct, which is decidedly swollen or enlarged toward its insertion 

 low on vagina. Dart sack and mucous glands wanting. 



The shell has much the aspect of a Helicigona of the cyclolabris 

 group, but the lip is less expanded and more thickened within, as 

 in Theba. The group is doubtless correctly placed by Hesse and 

 v. Ihering, who consider it a Fruticicoloid with the dart apparatus 

 lost by degeneration. The jaw and other anatomy as far as known, 

 as well as the structure of the shell, all point to this solution of the 

 simple genitalia. It will be noticed that in Metafruticicola the loss 

 of the dart apparatus has left exactly the type of genitalia found 

 in the group Epiphallogona (Camcena, Chloritis, Planispira, etc.). 

 No jaw of the delicate Fruticicola type has been found in the Epi- 

 phallogona. 



Distribution, Grecian Archipelago, most species from Crete. 



H. pellita Fer., iv, 115. H. lecta Fer., viii, 191. 



v. kreglingeri Zel. H. sublecta Malz., iv, 116. 



v. graphicotera Bgt. H. zonella Pfr., iv, 110. 

 H. testacea Mart., viii, 191. notthefigs. cited. 



H. dictsea Mart., viii, 191. H. medea West., viii, 192. 



H. naxiana Fer., iv, 115. H. giurica Bttg., yiii, 192. 



H. westerlundi Bl., iv, 115. H. cerigottana Bttg., Nachr. '94, 

 H. noverca Friv., iv, 115. 6. 



Section Perforatella Schliiter, 1838. 



Perforatella SCHLUTER, Syst. Verz., 1838. Petasina MORCH, 

 Catal. Yoldi, 1852, p. 6 (for edentula Drap.). 



Shell low-trochoidal, with rounded-conic raised spire, subangular 

 periphery and small or minute umbilicus. Whorls numerous and 

 narrowly coiled. Brownish, often with a light peripheral band. 

 Aperture basal, narrow ; basal lip expanded, thickened within by a 

 very strong callus, which is usually more or less truncate or 1-toothed. 

 Type H. unidentata Drap. 



Jaw thin, horn-colored, with 18-25 riblets (leucozona]. Genitalia 

 (pi. 70, fig. 36, H. leucozona} as in typical Fruticicola. The mucus 



