1 4-2 Analijsis of Periodical Works 



turam juxta simpliciter sulcatis ; sutura alveata ; base granona. 

 From Amboyna. 



Sowerbi/s Genera of Shells. No. 7. 



No letter-press accompanies this nmiiber; the plates of 

 which refer to the genera Chama. Isocardia Lam. (the tj'pe 

 of which is the Linnaean Chama Cor.) Iridina Lam., Solemya 

 Lam., Limnea and Physa. 



From the two latter plates it appears Mr. G. B. Sowerby pro- 

 poses to unite the genera Limnea and Physa. This however 

 will not be consistent with the structure of their respective 

 animals, which are widely different; and we would rather see a 

 greater adherence to the original definitions of Cuvier and La- 

 marck in an elementary work of this nature. 



Mineral Conchology by Mr. J. Sofwerby. No. GS. 



We are glad to see this interesting and valuable work con- 

 tinued with so much spirit. In this number Mr. Sowerby 

 apparently very accurately figures three species of the modern 

 genus Canccllaria, and gives their English (why not Latin ?) 

 specific distinctions, and a generic character. This latter ap- 

 pears to us not so concise or clear as might be wished ; and 

 we would rather have seen a transcript of Cuvier or Lamarck's 

 definition, particularly as the genus was instituted by the latter. 

 The species consist of C quadrata, eindsa, [Biiccinum emdsum 

 of Brandon,) and Iccvitiscida. All from Barton and Hordwell 

 cliffs in Hampshire. 



PL 362. Corbtda nitida and cuspida, from the Isle of White, 

 and C. complanata, from the crag at Roydon. Three species 

 apjjarently undescribed; likewise Mya grcgaria, an unequivalve 

 shell, which, if ascertained to be fluviatile, must, as Mr. S. ob- 

 serves, be removed from this genus. 



PI. 363. Mya arenaria, apparently the same as the recent 

 species. 



PI. 364-. Os/rea car i7iaf a, v/ith six well drawn and interest- 

 ing figures of this curious fossil shell. 



The Monthly Botanical Works are as follows : 

 Tlie Botatiical Register. This has the very great advantage of 

 being enriched by the contributions of our illustrious botanist 

 Robert Brown, Esq., and possesses a decided excellence in the 

 ample dissections given of the generic characters, and the co- 

 pious descriptions of the species. The 90th number contains 

 PI. Gil. Caladium odonim, a genus separated from Arum by 

 Mr. Brown. PI. 642. Brachysema undulatum. The second 

 species of this genus, yet known, recently brought from New 

 South Wales, characterized as follows : B. foliis ellipticis uu- 



ihilatis 



