PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 493 



ON HOME NEW OR lilTTIiE KlVOWfV DKCAPOU CRV$«TA€EA. FBOHI 

 RECENT FI8M C'OrainiSiSION DREDOINOS OFF THE EAST COAST 

 OF THE VNITEIO STATES. 



By SIDJVEY I. SiniTH. 



Anamathia* Agassizii. 



Amathia Agassizii Smith, Bull. Mus. Comp. Zool., x, p. 1, pi. 2, figs. 2, 3,1882; 

 Proe. Nat. Mus., vi, p. 3, 1883 ; Report U. S. Fish Com., x, for 1882, p. 346, 

 1884. 



This species will probably prove to be synonymous with A. crassa 

 A, Milne-Edwards, the description of which I had not seen when my 

 species was published. 



A male taken this season is almost as large as the large female taken 

 last year. Soon after preservation in alcohol the red color ui)on the 

 peraeopods was very bright, and there was considerable red on the 

 carapax also. 



The name Amathia given to this genus by Roux in 1828 had been 

 used in 1812 by Lamouroux for a genus of Bryozoa. Eoux's genus in- 

 cludes the following species : 



Anamathia Rissoana (Roux). Mediterranean. 



Anamathia hy sir ix {^iim\}.). Straits of Florida. 



Anamathia Tanneri (Smith). Off Delaware Bay and Martha's Vine- 

 yard. 



Anamathia crassa (A. M.-Edw.). Straits of Florida. 



Anamathia Agassizii (Smith). Off Carolinas and Martha's Vineyard. 



Anamathia modesta (Stimp.). Straits of Florida. 



Munidopsis Whiteaves. 



A careful examination of the structural characters of the type species 

 of this genus with A. Milne-Ed wards's Galacantharostrnta, my G.Bairdii, 

 and the two species here described, induces me to refer them all to a 

 single genus. The oral appendages are almost exactly alike in all the 

 species, except unessential differences in the armament of the second 

 gnathopods. The number and arrangement of the branchiae are the 

 same in all and like that in the typical species of Munida^ though the 

 number of epipods varies. In Munidopsis curvirostra and Bairdii there 

 are only two epipods on each side as in the typical species of Munida, 

 one at the base of the maxilliped and the other at the base of the sec- 

 ond gnathopod; in Munidopsis crassa and similis there is an additional 

 pair at the base of the first peraeopod; while in Munidopsis rostrata 

 there are additional ones at the bases of each of the first three pairs of 

 peraeopods. The eyes in Munidopsis Bairdii, crassa^ and similis are 

 much alike and considerably different from those of the other species, 



* Nom. nov., vice Amathia Roux, praeoc. 



