CURRENT LITERATURE. 33 



oldest inhabitants of tliese islands are Paliidesirina vcittrosa and sta^riaHs, with 

 which may be associated Eitliyiiia fcntaciilata and VaJvata fiscinalis, all of 

 whicli probably had their origin in the Aralo-Caspian basin. The Lusitanian 

 is also regarded as one of the oldest in these islands, no evidence of boreal 

 species being found until the later Red Crag of Butley. The Southern Group 

 is composed of species with various sources of origin. Finally, such forms as 

 Hygroinia fiisca, Acaiitliiniila laineJlaia, Vitrea excmuita, V. aUiaria, and Azcca 

 tridciis, may be endemic ; all as yet being unknown in a fossil state on the 

 Continent. 



A bibliography and table of the distribution complete this very welcome 

 memoir, 



Dall, W. H. and Simpson, C T.— The Mollusca of Porto Rico. U. S. Fish 

 Commis. Bull for 1900, 1901, pp. 351 — 524, pis. 53 — 58. 



This valuable and interesting work treats of, in a very full manner, the 

 mollusca of the island of Porto Rico, and forms the most complete account yet 

 published. The total number of species recorded is 653, of which 42 are new. 

 The land-snail fauna is not especially striking. The solitary Circiiian'a concolor, 

 if it be a genuine Circinaria, is a remarkable case of geographical distribution. 

 'Equally remarkable is the Claiisilia hicanaliciilata, found only in Porto Rico, 

 and the only representative ot this genus known from the ^^'est Indian region. 

 Very fine and large species of Plciirodontc, a single species of StoastoDia, four 

 species of Gaeotis, and nine species of Planorbis, are also present. 



Numerous changes in nomenclature have been made, but the law of 

 priority has not in all cases been adhered to. 



A brief description of the different genera and species, with references to 

 the original descriptions and figures, greatly adds to the value of this work. 

 While several species hitherto unfigured, have now been figured from the 

 authors' types. 



Dall, W. H.— Mollusks from the vicinity of Pernambuco. Proc. Wash. Acad. 

 Sci., 1901, vol. iii., pp. 139 — 147. 



Dr. Dall here enumerates 91 species obtained during Dr. J. C. Branner's 

 expedition to Brazil. Deducting from them four species coniined to land or 

 fresh water, there remain 87, of which 13 alone are peculiar to the eastern coast 

 of South America south of the West Indies, and 74 are common Antillean shells. 

 Two new species are described, viz. Miiliuia biaiincri and Drill la iirctieyi. 



Andreae, A. — Untermiociine Landschneckenmergel bei Oppeln in Schlesien. 

 Mitth. a. d. Roem.-Mus., Hildesheim, 1902, nr. 16, pp. i — 8, figs, i — 5. 



The new species described and figured are : Daiidehardia pniccitrsor, 

 A rchaezoniics subaiignlosiis (Benz.) var. cotiica, n.v., H d ix (Galadocli il lis ) silcsiaca, 

 and Cyclostonia scliraiiimeni. Claiisilia (Triptychia) siievica, Sandberger, and 

 Craspedoponia lepfopoiiioides (Reuss.) are also recorded. 



Dall, W. H. — Synopsis of the Liiciiiacca and of the .American species. Proc. 

 U.S. Nat. Mus., 1901, vol. xxiii., pp. 779 — 833, pis. xxxix — xlii. 



Continuing his valuable series of synopses Dr. Dall here treats of the 

 Lticinacea, a group of families, apparently of very ancient lineage if the Silurian 

 type referred to it is really allied. The systematic arrangement of the group, 

 appears to be exceptionally confused. Many of the commonest species the 



