MARINE ISOPODA OF NEW ENGLAND, ETC. 

 Specimens examined. 



319 



* Asellus gronlandicvt Packard, MSS. 



Janira Leach. 



Janira Leach, Edinb. Encyc., vol. vii, p. "434" (Amer.ed., p. 273), "1813-14". 

 Asellodes Stimpson, Mar. Inv. Grand Manan, p. 41, 1853. 



Body loosely articulated as in Asellus; antennulse slender, with a 

 multiarticulate flagellum j antennae elongated, with a spine, or scale, on 

 the second segment and with a long multiarticulate flagellum; mandibles 

 palpigerous ; lateral margins of the thoracic segments not completely 

 covering the bases of the legs ; first pair of legs prehensile ; the carpus 

 thickened, and the propodus slender and capable of complete flexion on 

 the carpus ; dactylus short and armed with two small ungues, as in the 

 succeeding pairs of legs ; uropods well developed, biramous. 



This genus is represented on our coast by two species, one of which 

 was originally described by Stimpson under the name Asellodes alia. It 

 does not, however, seem to present any generic differences from Janira 

 maculosa Leach, the type of the present genus. Stimpson's generic 

 description appears to have been drawn from the male, as he says : " Ex- 

 ternal pair of natatory feet having each two laminas, like the others, but 

 broader and hardened, so as to perform the office of an operculum." 

 The two inner of these laminae are, however, united along the median 

 line nearly to the tip, as will be seen below. 



Our species of this genus may be further characterized as follows : The 

 body is elongate oval in general outline, between two and three times as 

 long as broad. The eyes are distinct. The head is produced medially 

 into a distinct rostrum, and the antero-lateral angles are also produced, 

 but in the typical species (J. maculosa Leach) the head is rounded ante- 



