Quai terly Journal of Conchology. 195 



Correspondence, pp. 308 — 310. A letter from Mr. Wollaston 

 is published, giving an account of the fauna of St. Helena. Mol- 

 lusca are very few, especially in the higher regions, but Mr. Wol- 

 laston believes that he has added 5 new species to the list — the 

 common European Helix pidchella, a small Patula ^xo\)'^\^ pusilla, 

 a small Hyalinia, undetermined, a reddish Limncea, and finally a 

 magnificent new BiiUmus, of which most of the specimens were 

 dead, but one or two were living. M. Crosse conjectures that this 

 may be the B. auris-vulpina, known as subfossil from St. Helena 

 since the time of Chemnitz, but never before found alive. 



Journal de Conchyliologie, October, IS/G. 



Crosse & Fischer. — Mollusques fluviatiles recueillies au 

 Cambodge par le Mission scientifique fran^aise de 1873 (Fluviatile 

 moUusca collected in Cambodia by the French scientific expedition 

 -of 1873), pp. 313—342. 



This expedition was rather archaeological than zoological, 

 nevertheless naturalists were attached to it — MM. Jullien andRatte 

 — and made collections in a part of the basin of the Mekong hith- 

 erto unexplored. A list of 43 species is given. Palndina Ffaiien- 

 feldi, Desh., is altered to P. Rattei, on account of P. Frauenfeldi, 

 Morelet, having priority. Paludina Cambodjensis, Mabille & Le 

 Mesle, and P. Chalanguensis,Y)esh., are probably the same ; the 

 former name would have priority. The new genus Pachydrobia is 

 proposed for Pachychiltcs parvus, Lea, from Siam, and a new spe" 

 cies, P. paradoxa, Cr. & F., (PI. x, fig. 3) from sandbanks in the 

 Mekong. Unio (Arconaia) Delaportei, ( PL x, fig. i, and PI. xi, 

 fig. 5) and Pseudodon Harmandi (PI. x, fig. 2) are described as 

 new ; the former is a most remarkable species, having one side of 

 the valves prolonged into a beak. Pseudodon (Monocondylea) tu- 

 jnidus, Desh., is renamed P. Moreleti, on account of an older 



