PROCEEDINGS OF THE NATIONAL MUSEUM. 



359 



Measurements of Callinectes larvatus. 



The localities from which specimens have been examined are as follows: 



Florida: Long Key (No. 14890, U. S. N, M.); near Indian Kej- (No. 14032, 

 U. S. N. M.) ; Big Pine Key (No. 14892, U. S. N. M.) ; Key West, various col- 

 lectors; Tortugas (Nos. 2097, 2142, U. S. N. M.). 



Bahamas; New Providence, str. Albatross (No. 17948, U. S. N. M.). 



San Domingo; W. M. Gabb (No. 4172, U. S. N. M.j. 



Jamaica: Cozumel; Old Providence; Sabanilla, United States of Colombia; 

 Curayaoj str. Albatross. 



St. Thomas; A. H. Eiise (No. 2446, U. S. N. M.). 



Brazil: Rio Grande do Norte, Thayer Expedition (Mus. Comp. Zool.) ; Rio Ver- 

 melho, Bahia, R. Rathbun, Hartt Explorations, 1875-77 (carapace of young 

 specimen). 



Porto (irande, St. Vincent, Cape Verde Islands; United States Eclipse Expedi- 

 tion, 1889, one young female without clielipeds. 



Africa, United States Eclipse Expedition, 1889: Baya River, Elmina, Ashantee 

 (No. 14878, U. S. N. M.) ; St. Paul de Loando (No. 14877, U. S. N. M,). 



Kecorded from Vera Cruz, Mexico, by A. Milne-Edwards. 



Ne2)tunus margiiiafu.'i, A. Milne-Edwards, as Professor Smith has 

 pointed out, was probably based on an immature female of a Callinectes. 

 It is from "Cote du Gabon," West Africa. 



CALLINECTES TUMIDUS, Ordway. 



(Plates XVIII; XXIV, fig. 6; XXV, fig. .5; XXVI, fig. ,5; XXVII, fig. 5.) 



Callinectes tumidiis, Ordway, Boston Journ. Nat. Hist., VII, p. 574, 1863. 

 Callinectes fHwidHS, A. Milnk-Edwards, Crust. R^g. Mex., p. 226, 1879 (variety of 

 Callinectes diacanth us). 



Carapace very convex; depressions deep; length of intramedial area 

 no more than half its anterior width. Frontal teeth (Plate XXIY, fig. 6) 

 four, triangular, tips rounded, the two median large and prominent, but 

 not so far advanced as the lateral. Submedian tooth short, exceeding the 

 front but little. Suborbital lobe rounded. Antero-lateral margin very 

 arcuate. Lateral teeth broad, the first six very convex on their pos- 

 terior margins and obtuse, the next two acute. Of the eight teeth, the 

 fifth is the largest; the sixth and seventh are next in size. Lateral 

 spine less than twice the length of the preceding tooth. Penultimate 

 segment of male abdomen (Plate XXV, fig. 5) similar in shape to that of 

 ('. ornatus^ but much shorter. Aj^pendages (Plate XXVI, fig. 5) reach- 

 ing to about the middle of the penultimate segment, the tips incurved. 

 In the abdomen of the female (Plate XXVII, fig. 5) the ])enultimate seg- 

 ment is sliorter than the fifth, and its margins are veiy arcuate. The 

 spine at the distal end of the inerus and the carpal spine are almost 



