MAEINE ISOPODA OF NEW ENGLAND, ETC. 325 



Munna Kroyer. 

 Munna Kroyer, Naturhist. Tidssk., B. ii, p. 615, 1839. 



Form of the female dilated oval, of the male elongated sublinear ; head 

 very broad (about twice as broad as long), in length equal to one-fourth 

 or one-fifth the length of the animal ; eyes occupying the postero-lateral 

 angles of the head, prominent, as if pedunculated but not movable ; an- 

 tennulae inserted above the antennas and partly covering their bases, 

 short, a little longer than the head, with a four-jointed peduncle and a 

 few-jointed nagellum; antennae elongated, equaling or surpassing the 

 length of the body, with a multiarticulate nagellum ; mandibles with a 

 three-jointed palpus ; maxillipeds with a five-jointed palpus ; legs all 

 armed with two terminal ungues ; first pair shorter and more robust than 

 the others, with a prehensile hand formed of the propodus and the dac- 

 tylus ; the remaining pairs ambulatory, increasing gradually in length, so 

 that the last pair equal or surpass the body in length. The segments 

 of the pleon are united into a single vaulted segment, and its inferior 

 surface is covered, in the females, by a single opercular plate, while in the 

 males the operculum is composed of three parts, as in the preceding 

 genera. 



The generic description as given above is in part taken from Kroyer, 

 the author of the genus. The specimens hitherto obtained do not ap- 

 pear to be separable from his species M. Fabricii, to which I have there- 

 fore referred them, although differing somewhat from each other. The 

 material has unfortunately been, most of it, in poor condition, many of 

 the specimens having been dried and much broken. 



Munna Fabricii Kroyer. 



Munna Fabricii Kroyer, Nat. Hist. Tidssk., II, B. ii, p. 380, 1847 ; Voy. en Scand., 



Crust,, pi. xxxi, figs. 1 a-q. "1849". 

 Reinhardt, Gronlands Krebsdyr., p. 35, 1857. 

 M. Sars, Christ, Vid. Selsk. Forh., 1858, p. 154, 1859. 

 Liitken, Greenland Crust., p. 150, 1875. 

 Harger, Proc. U. S. Nat. Mus., 1879, vol. ii, p. 159, 1879. 

 Munna, species, Verrill, Am. Jour. Sci., III, vol. vii, p. 133, 1874 ; Proc. Am. Assoc., 



1873, p. 371, 1874. 



? Munna Bceckii G. O. Sars, Arch. Math. Nat., B. ii, p. 353 [253], 1877. (M. Bosckii 

 Kroyer 1 ) 



PLATE III, FIG. 14. 



This species may be at once distinguished from anything else known 

 on our coast by the prominent, as if pedunculated, but immovable, eyes, 

 on the posterior lateral angles of the large head, together with the elon- 

 gated and slender ambulatory legs in seven pairs, the first pair only 

 being somewhat shorter. 



The first specimens obtained in a recognizable condition were small 

 and differed somewhat from later specimens, especially in size and pro- 

 portions ; the differences, however, do not appear to be necessarily other 

 than what might be due to age and size, and are such as are described 



