MOLLUSCA CONCHIFERA. 229 



dcpressa, tenul, fragili, alba, liiante, subaequilatera, postice subangulata, 

 subinsequivalvi ; cai'dine augusto iinidentato ; nympbis iucrassatis, proi'uiidis. 

 P atria ? In the third part of Philippi, a plate contains T. (Suleii) conslricta, 

 Brug. (Psammabia cayennensis, Lam.) ; and, besides this, four species as new: 

 T. sericena, truncata, and hippopoidea, Jouas, from Cldua, and T. pelludda, 

 Phil., without any assigned locality. 



Douax Powisiana, Eecluz (Hev. Zool. p. 261), locality unknown. I), sal- 

 carius, Menke (1. c.) Five new species are described by Hauley (Proc. 

 Zool. Soc. p. 5) : I), semisulcata, ptinctalo-striata, carinatu,, dentifera, and 

 pulchella : the last from the West Indies ; the native localities of the others 

 unknown. 



Hinds describes 22 new species of Corbula, collected partly in the voyage 

 of Captain Belcher, and partly by Gaining; most of them from the Philip- 

 pines, some from the west coast of America. 



Mactra decussata, Menke (1. c.), from the west coast of New Holland. 



Mesodesma lata, Deshayes (Gueriu, Mag. pi. &0), testa ovato trigona, 

 depressa, solida, Isevigata, transversim, substriata, suba'quilatera ; latere 

 postico breviore, antico latiore ; marginibus iutegris ; apice miniine ; 

 cardiixe augusto ; foveola ligameutali profunda. Patria ? M. triquetrum 

 andplanuni, Hauley. (Proc. p. 101.) 



Recluz defines, in the 'Rev. Zool.' p. 1G6, a new genus, Poroma, between 

 Erycuta and Amplddesma, with the following characters : " Animal fere 

 ignotum, pallio postice bilobo : siphonibus duobus, disjunctis ; pecle piano, 

 acuto. Testa ovata, sen subrotuuda, regularis, trausversalis, requivalvis, 

 iuaequilatera, clausa ; apices miimti, antice recurvati. Lunula areaque nulla3. 

 Cardo deutibus cardinalibus duobus in utraque valvula, apicali minima autc 

 auctam, autica majori apicalem approximata, traiisversali, coucava, ad margiuem 

 superam inflexa, et in valvula dextra inserta, fossula interposita, elougata 

 oblique valde trausversali, sub deute laterali decurreutc, ligamentum mag- 

 num, cartilagiueum, uuicum ferente ; dente laterali uuica, postica, remota, 

 in valvula sinistra, triaugidaria, in dextra inserta. Lnprcssioues muscidares 

 ovales. asqualcs. Sinus palliaris nidlus." It embraces 3 species, P. Adan- 

 sonica (Le poron, Adans), from Senegal, P. Pettiiana> from Peru, P. rubra 

 (Cardium rubrum, Montagu, Kellia rubra, Turt.), from the English coast. 



Recluz (Rev. Zool. p. 292 and 359) divides the genus Amphldesma (after 

 deduction of the species with simple ligament) into two genera. The first 

 of these, of which Ainphidesmft rarie/jata, Lam., and A. reticulata, Sow. 

 (Lucina ret., Lam.), are the types, retains the name of Amphidesma ; the 

 other, which includes Ampli. Boj/sii, prismatica, tennis, nucleola, and puiyju- 

 rascens, Lam., Eryclna Renieri, Brown, and Aiiipli, scymentum, Costa, receives 

 the name of Syndosmya. It presents a new species, S. ocitanica. All these 

 species are European, and very small. Mantle with wide opening, being 



