AMERICAN NATURAL HISTORY. 



49 



GiRARD (Charles). Essay ori the classification of Nemertes and 

 Planaria ; preceded by some general considerations on the 

 primary divisions of the animal kingdom. — Amer. Journ. 

 of Sc. XL 1851, 41. — edit, emendat. in Proc. Amer. Assoc. 

 Adv. Sc. IV. 1851, 258. i 236 



Gould (A A.). Descriptions of a number of California shells col- 

 lected by Maj . William Rich and Lieut. Thomas P. Green, 

 U. S. N.— Proc. Bost. Soc. Nat. Hist. IV. 1851, 87. (237 

 Nov. sp. 



Amphide&ria flavescens. Lutraria undulata. 



Anodon ciconia. ventricosa. 

 Arthemis saccata. Mactra mendica. 



Avicula sterna. nasuta. 

 Cardium luteolabrum. Mytilus glomeratus. 



Donax obesus. Petricola bulbosa. 



Lima tetrica. . Pholus ovidea. 



Lithodonius falcatus. Strigella fucata. 



Lucina orbella. Tellina miniata. 



Kurtz (J. D.) and Stimpson (W.). Descriptions of several new 

 species of shells from the Southern coast. — Proc. Bost. 

 Soc. Nat. Hist. IV. 1851, 114. . 1 (238 



Nov. sp. Chemnitzia spirata. Mangelia rubella. 



Eulima conoidea. Rissoa pupoidea. 



oleacea. Pleurotoma cerinum. 



Leidy (Joseph). On some American fresh water Polyzoa.— Proc. 



Acad. Nat. Sc. Philad. V. 1851, 320. (239 

 Nov. sp. 



Pectinatella (n. g.) magnifica. Pahidicella elongata. 



(crisalla magnifica.) Urnatella (n. g.) gracilis. 



Plumatella nitida. 



Morelet (Arthur) . Testacea novissima insulse Cubanse et Americac . 



centralis. Pars 1.1850. Pars II. 1851. Paris. 8vo. (240 

 Nov. sp. 



Acliatina cylindrella. Ancylus radiatilis. 



linifera. Anodon bambousearum, 



Ampullaria cubensis. lurulentus. 

 Ancylus excentricus. Bulimus cucullus. 



