406 



3. Partial isca abyssi, Boeck. 



(PI. 143, fig. 1). 

 Pardalisca abyssi, Boeck, Crust, aiiiphip. bor. & ai'ctica, ]>. 72. 



Body, as to its general appearance, very like that in the type species, 

 though perhaps, even a little more slender. Last segment of metasome and 

 the first 2 of urosome armed in exactly the same manner as in that species. 

 Cephalon about the length of the first 2 segments of mesosome combined, 

 rostral projection very small, anterior edges passing into the inferior by a 

 rather strong but even curve. Coxal plate.s as in the 2 preceding species. 

 Last pair of epimeral plates of metasome but little produced at the lateral 

 corners, and nearh- rectangular. Eyes very large, occup^-ing the entire height 

 of the front part of the cephalon, and distinctly sigmoid in form, lower part 

 considerably expanded, pigment light red. Superior antennae in female scarcelj'' 

 exceeding in length Vs of the body, pedirncle about as in P. cuspidata, flagellum 

 3 times as long as the latter, accessory appendage half the length of the 

 peduncle and 5-articulate, 1st artici;lation not very much larger than the 

 others. Inferior antennae exceeding the superior by nearly Va of their length. 

 Antennae in male modified in the usual manner, accessory appendage of the 

 superior ones composed of the same number of articulations as in female, but 

 having the 1st one very large and laminar. Maxillipeds differing a little from 

 those in the type species, having the masticatory lobes comparatively smaller 

 and the palp more slender, with the 2nd joint very narrow. Gnathopoda 

 resembling in shape those in the 2 preceding species, with this diflPerence, 

 however, that the dactylus, instead of being lamellar, is simple unguiform, 

 and armed along the concave edge with a row of small spini^les. Pereiopoda 

 nearly as in P. ruspidata, the dactylus of the 3 posterior pairs being, as in 

 that species, rather short and broad. Last pair of uropoda having the outer 

 ramus somewhat larger than the inner, both prominently foliaceous in cha- 

 racter, and edged interiorly with ciliated setae. Telson scarcely twice as long 

 as it is broad at the base, evenly tapering distally, and provided on each 

 side with 4 marginal spinules, cleft very deep and narrow at the bottom, 

 terminal lobes bidentate at the tip, and bearing each a single apical spinule. 

 Body semipellucid, with a slight orange tinge on the back; ova in the 

 marsiipial pouch rose-coloured. Length of adult female reaching 23 mm. 



Ilfmarlis. — The present species, established by Boeck, is easily 

 distingui.shable from the 2 preceding ones by the rather ditferent .shape of 

 the dactjdus of the gnathopoda, and by the very large eyes. It also grows 

 to a much larger size than any of the otlier species. 



