The abdomen, which is 3-times as long as the carapace, agrees with Fig. 4 of the 

 "Ilhistrations", the lower margin of the 2"^ pleura appears slightly concave in both specimens. 

 Telson (Fig. 766) in both specimens a trifle longer than the 6''' somite, abruptly contracted just in 

 front of the middle; the upper surface is slightly concave from the posterior extremity almost to 

 the anterior, the infero-lateral margins of the anterior widened part are slightly sinuate and the 

 lateral parts of the telson are also concave, the concavity reaching from the middle of the widened 

 part to the posterior extremity. The telson which is slightly curved longitudinally, appears a 

 little shorter than the uropods when these are directed straight backward and when the terminal 

 spines of the telson are not included; when these spines are included, it appears in the female 

 just as long as the uropods, in the male not yet. The tip (Fig. y6c) of the telson, which is rounded 

 though with a small acute spine in the middle, is namely armed with four slender spines of equal 

 length, that are 0,8 mm. long, nearly one-sixth the length of the telson; one observes more- 

 over on the lateral margins of the upper surface three pairs of very small spinules, the anterior 

 ])air just in front of the contraction, the 2"'' a little farther from the anterior pair than from 

 the tijj, the 3''' pair, finally, on the posterior extremities of these margins, so that the tip is, 

 properly speaking, armed at either side with three spines, two of which are very long, the third 

 very small. The telson oi Prion, pectinata Faxon is much shorter with regard to the uropods, 

 broader in proportion to its length and contracted behind the middle, the telson of the third 

 species. Prion. Dojleifti, finally, has not been described. 



In the male the antennular peduncle, measured from the orbital margin, appears nearly 

 as long as the carapace, rostrum included and measured in the middle line, though not longer; 

 in llie female it measures only three-fourths the length of the carapace. The 1*' joint is more 

 than 3-times as long as the 2"'' and 3"^ taken together, the 2"'' slightly longer than the 3'''' ; 

 the outer flagellum is in the male nearly as long as the peduncle, though not shorter and 

 thicker than in the female, in which more than half the len^^th is broken off ; the much thinner, 

 inner flagellum measures in the male about two-thirds the outer. .Stylocerite acute, reaching as 

 far forward as the spiniform antero-lateral angle of the carapace. 



The antennal peduncle e.xtends in the male to the distal extremity of the 2^'^ antennular 

 article, in the female to the middle of 3'''^ ; the long and narrow scale reaches in the male just 

 beyond the far end of the 1*' antennular article, in the female to that of 2"'^ and measures in 

 the male two-thirds the length of the carapace, while in the female it is little more than halt 

 that length. 



The external maxillipeds reach in the male to the middle of 3"^'' antennular article, but 

 in the female by half their terminal joint beyond the antennular peduncle; exopodite small, 

 hardly reaching to the middle of the antepenultimate joint. 



The 1*' pair of legs, the dactylus excluded, extend in the male (Fig. "j^d) to the far 

 end of i"^ antennular article, in the female almost to that of 2"'', appearing in both as long as 

 the antennal scale. The stout 2"'' legs (Fig. 76^) reach in both specimens to the middle of the 

 propodus of the i^' pair and to the middle of the antennal scale, the slender t,^^ legs (Fig. 76/) 

 are as long as the external maxillipeds both in the male and the female, the strong legs of 

 the 4"' pair (Fig. 76^) reach to the tip of the propodus of the i^', the legs, finally, of the 5"* 



