CRUSTACEA MALACOSTRACA. IV. 



horrida or C. verrucosa by the tubercles on the carapace being less numerous and especially much lower; 

 from C. verrucosa it is also sharply separated by the shape of the merus in third maxillipeds. 

 Occurrence. Taken by the "Ingolf" at two stations. 



Davis Strait: Stat. 32: Lat. 66°35' N., Long. 56°38' W., 318 fath., temp. 3.9°; n specimens. 

 South of Jan Mayen: Stat. 116: Lat. 70°05' N., Long. 8°26' W., 371 fath., temp. —0.4°; 2 spec- 

 imens. 

 2,y. Gampylaspis horrida G. O. Sars. 

 (PI. III. fig. 7 a). 



1870. Campvlaspis horrida G. O. Sars, Forh. Vidensk. Selsk. Christiania for 1869, p. 162. 



1894. Norman, Ann. Mag. Nat. Hist. ser. 6, Vol. XIII, p. 278, PI. XII, figs. 6 — 7. 



!i 9 oo. G. O. Sars, Account, III, p. 89, PI. LXII. 



1913. Stebbing, Das Tierreich, 39. Lief. p. 196. 



The species is characterized by the rather produced pseudorostrum and especially by the high, 

 conical tubercles on the carapace. It agrees on the whole with Sars' figures, but some remarks must be made. 

 The carapace of the female has always posteriorly between the submarginal and the subdorsal keels a short 

 keel with two to five tubercles visible from the side, while the right figure of Sars shows only a single tubercle. 



- In the two posterior pairs of maxillipeds I found some differences from Sars' figures. Second maxillipeds 

 agree excepting in two points, viz. that the carpus has an oblong tooth on the distal inner angle, and propodus 

 a rather large, oblong one on the inner side near the end. Third maxillipeds differ in having the ischium 

 shorter and without distinct teeth, but the latter point is certainly on insignificant variation; a more impor- 

 tant difference is found in the shape of the merus (fig. 7 a) which is conspicuously more narrow than figured 

 by Sars, with its inner margin somewhat concave. — The uropods show very considerable variation as to 

 length, thickness and serration of the peduncles, breadth of the endopod and its number of spines. 

 Sars says that their peduncle is "coarsely serrated on both edges" and the endopod "armed with 

 only 4 spinules" ; according to his figure 3 on the inner margin, 1 long terminal spine, while the small 

 outer terminal spine is not counted; in his figure of the adult female the peduncle is scarcely as long as the 

 two posterior abdominal segments combined, while his fig."urs" shows the saw-teeth on the inner margin 

 to be rather high and distinctly higher than those on the outer margin. In a few specimens with vestiges 

 of marsupial lamella? the peduncle is even a little shorter than the two posterior segments together, robust, 

 with the serration on both margins as in Sars' figure, while the endopod is somewhat broad, as drawn by 

 Sars, with 3 or 4 spines on the inner margin and the 2 terminal spines. In two females with the marsupium 

 fully developed the peduncles are proportionately more slender and considerably longer, even in one female 

 somewhat longer than the two posterior segments combined, and the serration on both margins is conspic- 

 uously more feeble, on the outer margin nearly indistinct, the endopod more narrow, with 3 spines on the inner 

 margin. Some females with the marsupium rudimentary are intermediate between those described, though 

 generally more similar to the adults, but the number of spines on the inner margin of the endopod varies 



from 3 to 5. The peculiarities described show that length and serration of the peduncles, slenderness and 

 spinulation of the endopods ought to be applied with caution as specific characters in this genus. 



