152 AMERICAN JOURNAL 



The species described are : — ■ 



Lingula elegantula. Orthisina diversa, 

 Strophomena semiovalis. s y n - 0. VerneuilH, Billings. 



" reticulata. Plectambonites glabra, 



" nrmmtn S y n * Leptmna sericea, Billings. 



til O LlU/Cll. 7~1 7 « 7 *i 



u . . .. . P iectambonites area, 



Anticostiensis, g LeptcBna transversalis, Bil- 



Syn. 8. alter nata, Billings. lings. 



Strophomena alterniradiata. Plectambonites tenera. 



Brachyprion, N. Gr. Leptsena quadrilatera, 



ventricosum, Syn. Strophomena depressa, Bil- 



Syn. Stroph. Philomela, Billings ? lings. 



Brachyprion geniculatum. Platystrophia regularis. 



Orthis media, Atrypa impressa, 



Syn. 0. elegantula, Billings. Syn. A. reticularis, Billings. 



Orthis wquivalva, Atrypa flavella. 



Syn. 0. hybrida, Billings. Athyris turgida. 



Orthis rhynconelliformis. Spirifer tenuistriatus. 

 " alata. 



Annals of the Lyceum of Natural History of New York. VIII. 

 Nos. 6 and 7. November, 1865. 



Catalogue of the Mollusca of Little Gull Island, Suffolk 

 County, New York. BY Sanderson smith. 



The other papers contained in the present issue of the An- 

 nals we have already noticed as separate publications. 



Researches upon the Hydrobiinse and Allied Forms. By Dr. 



Wm. Stimpson, 8vo., 58 pp. Smithsonian Institution, Washington, 

 D. C, August, 1865. 



Under the above title the author has collected a mass of 

 important information regarding the structural characters and 

 affinities of the various species of minute fresh water shells, 

 which have been hitherto best known under the names of 

 Amnicola, Bithinia, Hydrobia, etc. He proposes to unite these, 

 as Messrs. H. and A. Adams have done, to the family Ris- 

 soidse, as he cannot find sufficient distinctive characters to 

 justify the separation of the fresh water species as a family, 

 Amnicolidee, as proposed originally by us,* and subsequently 

 adopted and denned by Prof. Theo. Gill.f 



Dr. Stimpson, after eliminating certain errors of Prof. Gill's 

 diagnosis as regards the American species, concludes that 

 there is no character left which would serve to distinguish the 

 Amnicolse and their allies as a distinct family from Rissoidse, 



* Proc. Acad. Nat. Sciences, Sept., 1862. 

 f Proc. Acad. Nat. Sciences, 1864, p. 35. 



