MARINE ISOPQDA OF NEW ENGLAND, ETC. 393 



not suddenly so and tapers but little posteriorly; the telson is flat- 

 tened, and regularly rounded behind. The " abdominal epimera" are 

 acute, the second smaller and more slender than the first, but their ex- 

 tension backward varies with the state of contraction of the pleon. The 

 uropods (pi. X, fig. Co a) surpass the telson, and have the inner angle of 

 the basal segment sharply produced. The rami are flattened; the ex- 

 ternal one twice the length of the basal segment, narrowly ovate or lan- 

 ceolate, sometimes slightly curved, and smpassing the telson by half its 

 length. The inner ramus is narrowly oval, obliquely truncate behind 

 and about three-fouiths as long as the outer. 



The length of the sijecimen figured, which was the one first described, 

 is 15""™, breadth 1""^, but specimens measuring 25'"™ in length have 

 siuce been collected; color brown or greenish, with two narrow dorsal 

 bands of lighter color, most evident at the extremities. 



The original specimen was obtained on the dorsal fin of Ceratacanthiut 



aurantia^us at Wood's Holl!, Vineyard Sound, in 1871, and two more 



specimens of larger size have since been obtained, also from Vineyard 



Sound!, Mass. 



^gathoa Dana. 



Mgathoa Dana, Am. Jour. Sci., II, vol. xiv, p. 304, 1852. 



Body elongate oval ; pleon not suddenly narrower than the thorax ; 

 head large, subtriangular ; eyes large ; legs nearly alike throughout, 

 with strong curved dactyli ; epimera of moderate size or small ; pleon 

 long and large, composed of six distinct segments ; pleopods not cili- 

 ated ; uropods more or less distinctly ciliated, rami subequal. 



This genus is represented in our fauna by a species parasitic in the 

 mouth of a squid. The large, granulated eyes remind one of ^ga, and 

 the ciliated uropods also indicate the approximation of this genus to the 

 preceding family. The ciliation is, however, nearly rudimentary in our 

 species, and is present, at least in the young, of other members of the 

 Cymothoiclce. 



iEgathoa loliginea Harger. 



jEgathoa loliginea Harger, Am. Jour. Sci., Ill, vol. xv, p. 376, 1878; Proc. U. S. 

 Nat. Mu8., 1879, vol. ii, p. IGl, 1879. 



Plate X, Fig. 66. 



The legs all armed with strong curved claws, the large conspicuous 

 eyes and the slightly ciliated uropods serve to distinguish the present 

 species from the other ]^opoda of our coast. 



Body elongate oval in outline, nearly four times as long as broad, 

 slightly dilated near the posterior end. Head broadly rounded in front, 

 subequally, but not deeply, trilobed behind. Eyes large, with evident 

 facets, lateral, semi-hexagonal, visible from below, covering nearly half 

 the area of the head above, projecting posteriorly beyond the middle 



