352 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



in their natural positions, aud in their true relative proportions. In Adams's plate the fourth 

 joint of the fourth thoracic leg has 10-17 rings, the fifth joint 8 rings. In the Nassau form the 

 carpus has 10-12, the propodns 5-7 rings. I-u details like this, where the right and left sides of 

 the same individual are often unlike, it would be surprising to find agreement. Von Martens's 

 short notice of the Cuban occurrence does not give us much additional knowledge, but there is no 

 doubt that the alcoholic specimens examined by him belong to the same species as that described 

 in this paper. He says : " Ich weiss keiuen erheblicheu Unterschied zwischen dieseu cubanischen 

 Exeinplaren und den iudischeu anzugebeu, welch letztere ich bei Amboina gesammelt habe. * 

 * Nur erscheiuen die iudischen im Lebeii bunt roth gezeichuet, in Spiritus blass orange und 

 mehr hartschiilig, endlich scheiut Carpus mid Hand des dritteu Fusspaars bei ihuen minder vier- 

 seitig, doch ist dieser letztere Unterschied gering und tiiesseiid." He then adds that he would 

 not be surprised if it should turn out that the West Indian form was specifically different from the 

 East Indian. 



So far then as we can judge from the figures and meager descriptions in our possession, the 

 Asiatic Stenopus hispidus can not be regarded as specifically distinct from the American form. 

 Perhaps a point of difference worthy of remark is the length of the body from rostrum to end of 

 telson, which is given as 2i and 3 inches by Adams and Dana respectively. None of the Nassau 

 specimens which I have measured were more than If inches long. The data upon this point are not 

 conclusive, and, in view of our knowledge of local variations in this respect, can not be regarded 

 as of much importance. It is hoped that the descriptions and measurements which are here given 

 will afford a basis for future comparisons with the Pacific Stenopus hispidus. 



List of species. 

 So far as I can learn, only five species of the genus Steuopus (Latreille) have been described, viz: 



(1) Stenopus liisi>iilns (Lair.): 



Distribution : () Indian Ocean, Borneo, and Philippines (Adams). 



(6) Pauuiotu Islands aud Balabac Passage, north of Borneo (Dana). 



(c) Amboyna, Cuba (Von Martens). 



(d) Abaco aud New Providence, Bahama Islands. 



(c) "Red Sea, Indian Ocean, Indian Archipelago, New Guinea" (do Man). 



(2) Stenopus spiaonni (Hisso) : 



Mediterranean (Heller), teste Von Martens and de Man. 



(3) Stenopus ensiferus (Dana): 



Fiji Islands. 



(4) Stenopus aemUeemt ( Ton ilartens) : 



(Out) specimen in the Berlin Zoological Museum, purporting to have come from the West Indies. Length 12""". 

 Von Martens.) 



(5) Stenopus teniiirostrit (de Man) : 



Amboyua: Length 24 ulm . (More closely allied to Stenopus spiuosus of the Mediterauean than to Stenopus 

 hispidus, and is the representative of the former in the Indian Oceau ; de Man.) 



STENOPUS LITERATURE. 



(1) Olivier: Encyclopedic Me'thodiqtie, Hist. Nat. Insectes, t. viii, p. 666, 1811. 



(2) Latreille: Encyclopedic Methudique, Hist. Nat. Crustacea, Arachnidses, et Insectes, t. 10, Paris, 1682. 

 (:!) Milne Edwards, H. : Hist. Nat. des Crustaces, t. 2, p. 40K, 1837. 



(4) AlUne Edwards, H. : Le Rcgne Auiuial, Cnvier ; Les Crustacea, with Atlas, by Milne Edwards, p. 137. 



(5) Adams and White: The Zoology of the Voyage of H. M. S. Samaraug, 1843-6, p. 61, London, 1850. 



(6) Dana, J. D. : U. S. Exploring Exped. U. S. N., 1838-1842, vol. xiii, pt. 1, Crustacea, p. 607. 



(7) Miirtcny, E. v. : Uober Cubanische Crustaceeu ; nach den Sanmihmgen Dr. J. Guudlach. Archiv. f. Naturgesch., 

 3S. Jahrg., Bd. 2, 187-2, p. 143. 



(8) Heller: Crustacean des siidlichon Etiropa, S. 299. (I have seen only references to this paper.) 



(9) De Man, J. G.: Bericht liber dieim iudischeu Archipel von Dr. J. Brock gesamnielteu Decapoden und Stomato- 

 podeu. Separat-Ausgabe aus deui Archiv. f. Naturgesch., 53. Jahrg., pp. 21ii-l>00, 17. Taf., Berlin, 1888. 



