OE THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 293 



is many-jointed and furnished with plumose setae. Apart from this it would be 

 difficult to separate this form from Hodgson's Merhippolyte australis, which Calman 

 has identified with Bate's Nauticaris marionis. 



The teeth continued from the carapace along the upper margin of the rostrum 

 are given by Milne-Edwards as six or seven, with one or two below. Our specimen 

 has eight above and one below. The stylocerite of the first antennas reaches beyond 

 the main body of the first joint. The scale of the second antennae extends beyond 

 the rostrum. The three-jointed palp of the mandibles is furnished on all the joints 

 with numerous setiform spines, the first joint much wider and longer than the second, 

 the second much wider but little longer than the third. In the first maxillipeds the 

 last three joints of the endopod are very different from those of N. brucei, the first 

 of them broad, fringed on the inner margin with eleven long setae ; the second longer, 

 narrower, curved, somewhat similarly fringed ; the third very short and narrow, 

 tapering, straight, tipped with a short seta. In the third maxillipeds the exopod 

 is about 2 '5 mm. long, while the last joint of the endopod measures about 8 mm. 

 On one of the second peraeopods fourteen components of the wrist are found. In the 

 spine armature of the seventh joint in the simple legs there are slight differences 

 between this species and N. brucei, but the specimens being so different in size, no 

 importance can be attached to these. Similarly, it may be doubted whether slight 

 variations in the armature of the telson have any specific value, but the larger apical 

 pair of spines are relatively much longer in the smaller of the two forms. The cara- 

 pace of the present species measures 14 mm. from apex of rostrum to the middle of 

 the concave hind margin ; the scale of the second antennae is fully 6 mm. long. 



Locality. — Port Stanley, Falkland Islands ; Station 118. 



Family Pasiph.eid^. 



1852. Pasiphasidx, Dana, U.S. Expl. Exp., vol. xiii. pp. 532, 536. 



1884. Pasiphaidee, S. I. Smith, U.S. Fish. Comm.for 1882, p. 381. 



1888. Pasiphxidee, Bate, Rep. Voy. " Challenger" vol. xxiv. pp. 481, 857. 



1890. ,, Ortmann, Zool. Jahrb., vol. v. p. 463. 



1893. Pasiphaidse, Wood-Mason and Alcock, Ann. Nat. Hist., ser. 6, vol. xi. p. 161. 



1893. Pasiph&idx, Stebbing, Hist. Crust., Inteinat. Sci. Ser., vol. lxxiv. p. 251. 



1895. Pasipheeiidse, Faxon, Mem. Mus. Comp. Zool., vol. xviii. p. 173. 



1901. Pasiphxidse, Alcock, Gatal. Indian Deep-Sea Macrura, pp. 55, 57. 



1902. „ Rathbun, Pr. U.S. Mus., vol. xxiv. p. 904. 

 1904. „ Rathbun, Hariiman-Eocp., "Decapods," p. 19. 



1906. „ Rathbun, U.S. Fish. Comm.for 1903, part iii. p. 927. 



1907. ,, Coutiere, Bull. Inst. Oceanogr. Monaco, No. 104, pp. 1, 12 (larval forms). 

 1910. ,, Kemp, Fisheries, Ireland, 1908, pp. 35, 36. 



The genera of this family may be briefly distinguished as follows : — ■ 



(Mandibles without palp, 2. 

 Mandibles with palp, 3. 

 TRANS. ROY. SOC. EDIN., VOL. L. PART II. (NO. 9). 41 



