HYGROMIA. 273 



1839 ( Aves). " Fruticola " of some writers. Bradybcena BECK, 

 Index Moll. 1837, p. 18. Not Bradybcenus Dej., 1829 (Coleoptera). 

 Trichia HARTMANN Erd- und Suss wasser- Moll. Schweiz, p. 41 (for 

 H. hispida, etc.). Not Trichia de HAAN, Fauna Japouica, Crus- 

 tacea, p. 109(1840!). 



Shell depressed, with convex spire, rounded periphery, and open 

 or narrow umbilicus ; brown or greenish, the surface generally 

 hairy. Aperture lunate, slightly oblique, the ends of the thin lip ap- 

 proaching; peristome simple, expanded only at the columellar inser- 

 tion, and with only a weak internal thickening or none. Type H. 

 hispida L., pi. 55, figs. 27, 28. 



Jaw delicate, with 10-18 low|riblets. Genital system (pi. 70, fig. 

 33, If. hispida) ; penis as usual in the genus ; mucus glands several ; 

 two dart sacks, each with an accessory sack. 



Hartmann's name Trichia has been used for this group, but its 

 date is uncertain (his book having appeared in parts, from 1840 to 

 1844), while Trichia de Haan is known to bear date 1840. More- 

 over it seems best to use Held's earlier term Fruticicola, which is 

 well known to all malacologists. 



The species are very numerous throughout the European area, 

 and several have been imported by commerce into America, etc. A 

 few Chinese species of unknown anatomy are best referred here 

 until their true position can be ascertained. 



H. aclerochroa Bgt, iii. 181. H. clessini Ulic. 



H. alsia Bgt., iii, 177. H. Corsica Sh., iii, 180. 



H. becasis Ramb., iii, 176. H. crispulata Mouss. 



H. bourniana Bgt. H. cynetarum Malz. 



H. crelata Stud., iii, 175. H. dieckmauni Mss., iii, 179. 



v. coelomphala Loc. H. dussertiana Bgt., iii, 177. 



v. vagienua Poll. H. erjaveci Brus. 



v. crelatina Loc. /. mortella, tanora, avarica, 



H. cedretorum Deb., iii, 179. savinella Serv. 



H. chnoodia Bgt., iii, 179. H. filicina Schm., iii, 176. 



H. chonomphala Bgt. v. nudata West. 



ripularum Lessona. H. fusca Mont., iii, 186. 



H. chrysotricha Bttg., viii, 190. corrugaia Gray. 



H. clandestina Hartm., iii, 175. subrufescenx Mill. 



gratianopolitana Ramb., iii, H. granulata Alder, iii, 178. 



v. isarica Loc. [175. globularis Jeffr. 

 18 



