1854.] 175 



form of its leaves from a regular elliptic form to ovate-lanceolate. The di- 

 mensions of the leaves from Colonel's Island are ll inches long and 2J wide. 

 Those from other localities are, 



Of the elliptic form, transverse diameter, 7 inches, 

 " conjugate, 4 inches. 



" ovato-lanceolate 7i long, 3J- wide. 

 Regular gradations may be found between these various forms. The opinion 

 expressed by Elliot that M. pyramidata is a variety of M. auriculata is there- 

 fore erroneous. Major Le Conte also stated, that he had been personally in- 

 formed by Mr. Bart ram that his M. pyramidata had lanceolate leaves. 



October 31 st. 



Mr. Ord. President, in the Chair. 



The Committees to which were referred papers by Mr. Dana, read 

 October 3d; by Dr. Heermann, read Oct. 10th; by Major Le Conte, 

 read Oct. 17th ; by Dr. Leidy, read Oct. 17th ; by Dr. Hallowell, read 

 Oct. 17th; severally reported in favor of publication in the Proceedings. 



Catalogue and descriptions of Crustacea collected in California by Dr. John. 



L. Le Conte. 



By James D. Dana. 



1. Anomoura. 



Hippa talpoides, Say. 



Clibanarius ^equalis, D., Rep. Crust. Exp. Exp., p. 464, pi. 29, f. 4. 



This Californian Clibanarius is identical with the Madeira and Cape Verde 

 C. eBquabilis, a species which is probably identical with one at the island of 

 Tahiti, in the Pacific. See Rep. Crust, loc. cit. 



2. Macroura. 



Callianassa Californtensis, D. Pes grandis superficie laevis ; manu ad 

 basin latiore, digito mobili non breviore quam manus dimidium, subuncinato, 

 gparsim hirsuto ; carpo superficie laterali nudo, marginibus ciliato, paulo oblongo, 

 parc<i breviore quam manus, brachio crassiusculo, carpum longitudine fere 

 aequante, infra juxta basin lobum subovatum denticulatumque gerente, articulo 

 precedente infra denticulato. Manus parva angusta, carpo parce brevior. 

 Long. 2i". 



3. Isopoda. 



Idot^a Oregonensis, D., Rep. Crust. Exp. Exp. p. 704, pi. 46, f. 6. 

 This species is named I.hirtipes in the author's report, and in the plate re- 

 ferred to ; the name is changed to /. Oregon en sis in the explanation of the plates 

 accompanying the latter, on account of its having been previously used. 



Idot^ea -media, D. I. Oregonensi affinis, paulo angustior. Corpus laeve, latere 

 paulo arcuatum. Abdomen sesqui longius quam latum, lateribus fere parallelis, 

 apice arcuato-truncato ad medium apiculato. Antennae externae tertia cor- 

 poris non longiores, flagello ferme 10-12-articulato, vix breviore quam basis, 

 fere nudo. Pedes fere nudi. Long. 10'". 



The abdomen is three-jointed, with an additional suture either side of the last 

 segment, as in the I. Oregonensis. 



Stenosoma (Idot;ea) gracillimum, D. Corpus angustissimum filiforme, seg- 

 ments thoracis plerumque subquadratis, capite quadrato. Abdomen lineare, 

 apice truncatum, 3-articulatum, segmento 3-tio utrinque sutura notato. Pedes 



