36 



STALK-EYED CRUSTACEA. 



^THUSINA Smith. 

 Ann. Rep. U. S. Eish Comm. for 1S82, p. 349, 1884 lElhusinal- 



n 



^thusina gracilipes (Mierb). 



Ethusa {Ethusina) gracilipes MxEiis, Rep. Challenger Erachyura, pp. 332, 333, Plate XXIX., 1886 



Station 3361. 1471 fathoms. 1 fcm. 



y 



a 



66 



3374. 1823 



3380. 



899 



yu 



a 



a 



a 



3398. 1573 

 3400. 1322 



3407. 



3413. 



885. 

 1360 



U 



a 



u 



iC 



(C 



u 



3 maleS; 2 fern. 



1 male. 



2 males. 



1 male^ 2 fern. 



1 fern. 



2 maleS; 1 fem^ 



In most of these specimens the spine at the antero-external angle of the 

 carapace is long, as in the figure of the typical form of Micrs's species, but it 

 is bent outward at a sharper angle, as in Miers's var. rohisicu The outer 

 sphie of the front is longer in proportion to the inner spine, and the carapace 

 is rather narrower. The legs are shorter (as in var. robuda)^ while the chela 

 is midway in form between the typical gracilipes and var. rohiista. 



The "Challenger" specimens were obtained near the Philippines in 700 

 fathorasj in the Arafiira Sea in 800 fathoms, and in the Banda Sea in 1425 



I 



fathoms. 



Ethusina challengeri (Miers)? 



* 



^.Ethusa {Eihusina) clmllcngen Miees, Rep. Challenger Brachyura, p. 331, Plate XXVIII. Tig. 2, 188G.' 



^Station 3414. 2232 fathoms. 1 fem. 



T refer this specimen with some doubt to JE. chalkngeri The fingers of the 



cheloG are longer than in that species, the internal distal angle of the ischium 



of tlie external maxillipeds is more salient, and the merus more pear-shaped ; 



the front, too, is narrower, the median sinus deeper, and the internal orbital 



angle less prominent. 



I believe that the depth from which this specimen was brought is the 

 greatest at which any Brachyuran has ever been taken. jE, ahyssieola Smith 

 was dredged by the "Albatross" off the east coast of the United States in 

 2221 fathoms. Miers's specimen of jE. challengcri was obtained from 1875 

 fathoms, in Japanese seas. 



* On pp. 329, 332, Micrs refers to this species by the name of JE, sinucUifrons. 



