3 3 



triangular (fig. 2/1), but the outer angle is distinctly, the inner very broadly, rounded. Exopod 

 of third pair (fig. 2/1) not fully twice as long as the endopod; counting its joints from the 

 distal end the two first joints are short, simple, but the 3 distal seta? of the terminal joint 

 and the outer seta' of the other joint are proportionately short ; the six following joints 

 — counted from the distal end — each at the outer side with a protuberance increasing 

 in size and especially in breadth from the most proximal to the most distal of these joints 

 (fig. 2i)\ counting again from the distal end of the ramus fifth, sixth, seventh and eighth 

 in small specimens only fifth, sixth and sometimes seventh - joints each on the outer side 

 with a slender process directed outwards and somewhat forwards and terminating in a fine, 

 naked seta. 



Uropods (fig. 2 k) with the endopod somewhat broad and at least reaching the end of 

 telson ; exopod considerably shorter than the endopod, with the end angular and the outer 

 margin furnished from the end to rather near the base with a large number of spines, nearly 

 all short, only the three or four most distal increasing gradually somewhat in length. Telson 

 about two and a half times as long as broad (fig. 2 k), tapering gradually and very moderately 

 in breadth from the base to near the end; the lateral margins along about two-thirds of their 

 length with numerous spines somewhat unequal in length, and several among them moderately 

 long; the terminal incision so narrow at the bottom that the spines from the opposite sides 

 nearly reach each other ; the terminal pair of spines long. 



Length of the male 6 mm., of the female 4.5 mm.; the Kröyerian male type preserved 

 in the Copenhagen Museum measures 7.0 mm. in length. 



Remarks. A. truncata G. O. Sars = A. typica G. O. Sars (not Kröyer) differs 



from the real A. typica Kr. in a number of features. The frontal plate is a little longer with 

 the transverse, straight terminal margin; the eye-stalks seem to be shorter; the protruding part 

 of the fifth joint of the male gnathopods is more removed from the distal end of the joint ; 

 the sixth joint of the first pair of the thoracic legs in the male is quite different, being divided 

 into 3 subjoints with about 1 1 long, cylindrical setae distributed along the distal two-fifths of 

 the interior margin of the joint and on its end; the pseudobranchial plate of the male pleopods 

 has the outer angle sharp and setose; finally the exopod of third pleopods (not fourth pair, 

 as stated by Sars) is extremely different, resembling much more a normal ramus. 



Distribution. — Kröyer's two specimens of A. typica were taken in the tropical 

 Atlantic, lat. 14 N. The Copenhagen Museum possesses a good number of specimens of this 

 species taken in Cruz Bay, St. Jan, Danish West-Indies, together with a large number of other 

 Plankton-Crustacea by Mag. se. C. Löfting (Jan. 10, 1896). Furthermore it was taken by Dr. 

 Th. Mortensen North of St. Thomas, West-Indies (1 specimen) and at two localities in the 

 Gulf of Siam, viz. near Koh-si-Chang, 10 — 15 fathoms (1 specimen) and in the Bay of Rayong, 

 7 — 10 fathoms (1 specimen). — Statements in the literature on the capture of A. typica ought 

 to be regarded with doubt until the specimens mentioned have been re-examined; it may, 

 however, be added that the specimens mentioned by Ortmann in his paper "Schizopods of the 

 Hawaiian Islands" (Buil. U. S. Comm. Fish and Fisheries for 1903, p. 97 2 — 973). according 

 to his remarks on 'first pair of legs in the male, certainly belong to A. typica Kr. 



