GASTROPODA (PULMONATA). Moll. 69 
and below ; A. giraudi, sp. n., Tanganyika, Bourguignat, (41 a) pp. 14 
& 15. 
The family Arionidce contains, according to Tryon (358), Avion (sec¬ 
tions Lochea , 3 sp., Garinella, 1 sp., Prolepis, 4 sp., Baudonia, 1 sp., Ari- 
unculus, 5 sp.), Geomalcus , 2 sp. (subg. Letourneuxia , 1 sp.), Ariolimax, 
5 sp., Hempliillia, 1 sp., these have no mucous pore ; the remainder, which 
have, are Anadenus , 3 sp., Prophysaon , lsp., Cryptostracon , 1 sp. 
Avion is divided into two groups (Monatriidce and Diatriidce) according 
as the lower portion of the genital passage remains the sole part common 
to the two sets of organs or forms in addition a second dilatation (egg- 
sac). Thus : 
Monatriidce. 
A. minimus. 
A. subfuscus. 
A. brunneus. 
A, bourguignati. 
This subdivision is further borne out by the coloration of the various 
species, and by what is known of their distribution. Simroth (336). 
Avion minimus , sp. n., Central Germany, near Leipzig, id. t. c. p. 237, 
pi. xi. figs. 14 & 15. A. brunneus united with A. subfuscus ; id. t. c. 
p. 280. A. atev var. veticulata, var. n., Ireland, Roebuck, J. of Conch, iv. 
p. 375 ; var, bicolor, Cornwall, Belt, Zool. (3) ix. p. 389. A. pol- 
lonerce , sp. n., Piedmont, Pini, (289) p. 381, pi. xii. A. ( Lochea) stabilei , 
A. ( Carinella ) subcarinatus , spp. nn., Piedmont, Pollonera, (299) p. 700. 
A. souevbieui, sp. n., S. France, Fagot, (11 8 a) p. 14. 
Bulimus nasutus , sp. n., Brazil, v. Martens, (256) p. 191. B. grandis , 
sp. n., Brazil, id. (254) p. 148. B. ilgi , B. chefneuxi, B. soleilleti, spp. nn., 
Shoa, Bourguignat, (39) pp. 11-14, fig. 5. B. girardi , B. reymondii , 
spp. nn., Tanganyika, id. (41 a) pp. 12 & 13. B. ( Placostylus ) cleryi. Petit, 
dimensions and sculpture, San Christoval, Solomon Islauds ; E. A. Smith, 
(343) p. 595. B. acutus , British distribution of ; Naturalist, x. pp. 112, 
181, & 366. 
Cochlostyla. Yon Mollendorff (263) points out that of 240 species 
enumerated by Semper & Pfeiffer, only 87 are placed by both in the 
same subdivision; a list of species, with their classification according to 
both authors, is given. 
Curvella , g. n. Shell thin, conical, without umbilicus, shining, 
whorls 5-6, outer margin prominent in the middle, retreating below ; 
columellar margin slightly emarginate; C. sulcata , C. inovnata, spp. nn., 
Assinie, Chaper, (72) pp. 48 & 49, pi. i. figs. 10 & 11. C. striata and C. 
inornata , Chaper, identical with Bulimus ( Hapalus) khasianus and B, 
(S.) munipurensis, Godwin-Austen ; Jousseaume, (207) p. xxii. 
Endodonta cretacea , sp. n., Soc ety Is., Garrett (136). 
Eudioptus aguirrei, sp. n., Argentine Republic, Doering, (104) p. 112, 
pi. ii. fig. 2. 
Glessula bretignerei , sp. n., Assinie, Chaper, (72) p. 46, pi. i. fig. 6. 
Hapalus jcusseaumi, sp. n., Perak, de Morgan, (270; p. 372, pi. v. fig. 2. 
DiATEIIDcE. 
A. empiricorum. 
A. hortensis. 
A. timidus. 
