REPORT ON THE AMPHIPODA. 1377 



and thickly ciliated near the base ; in the second pair the outer ramus is slightly the 

 shorter ; in the third pair the peduncles are rather longer, the inner ramus not shorter 

 but rather narrower, than in the second pair ; the outer ramus is broken. 



Tehon very small, not longer than broad, apically narrowed, the apex rounded, with 

 a thin edge. 



Length about three-tenths of an inch, measuring from the front of the head to the 

 back of the second pleon-segment and thence to the extremity of the uropods. 



Locality. — The specimen was labelled "July 1875, lat. 35° N., Japan to Honolulu, 

 surface." One specimen. 



Remarks. — The specific name refers to the delicacy of the general texture and 

 structure of the animal, which is in contrast with the strong chela? of the second 

 gnathopods and tenacious looking claws of the peraeopods. From the Mediterranean 

 species to which Claus gives the name of Phronimopsis spinifer at page 6 of Der 

 Organismus der Phronimiden, but the name of " Phronimopsis Zoea" at page 82 in the 

 explanation of the plates, the present species is distinguished by the absence of the 

 spine-process on the peduncle of the upper antenna? which Claus finds in both sexes of 

 his species ; it is also very different from the type-species in the shape of the peraeon 

 and the relative size of the pleon, as well as in the absence of pigment-markings, while 

 in many other respects it shows a remarkable resemblance to its European congener; 

 from Phronimopsis sarsi, Bovallius, inhabiting " tropical parts of the Atlantic," it is 

 distinguished, in having a pergeon which can scarcely be described as " normal," in having 

 the first segment of the perseon partially coalesced with the second, and in having the 

 telson rather triangular than semicircular, a fourth of the length of the peduncles of the 

 third uropods, instead of " shorter than a sixth." 



Genus Hyperia, Latreille, 1823. 



1823. Hyperia, Desmarest (from Latreille), Diet. d. Sci. Nat, Art. Malacostrac6s, t. 28. 

 1825. ,, Desmarest (from Latreille), Consid. gen. sur la classe des Crustaces, p. 258. 



1825. Hyperie, Latreille, Fam. nat. du Regne Animal, p. 289. 



1825. Hyperia, Guerin, Encycl. Meth., Art. TJroptere, t. x. 

 1829. „ Latreille, Le Regne Animal, t. iv. p. 117. 



1829. Hiella, Straus-Durckheim, Mem. du Mus. d'Hist. Nat., t. xviii. 



1830. Hyperia, Milne-Edwards, Ann. d. Sei. Nat., t. sx. p. 387 (extr., pp. 34, 36). 



1830. Lestrigonus, Milne-Edwards, Ann. d. Sci. Nat., t. xx. p. 392 (extr., pp. 34, 41). 



1831. Hyperia, Latreille, Cours d'Entomologie, p. 400. 



1836. „ Guerin-Meneville, Iconographie du Regue Animal, t. ii., iii., pi. xxv. 



figs. 5, 6. 



1837. „ Burmeister, Handbuch der Naturgesctiielite. 



1837. Lestrigonus, Burmeister, Handbuch der Naturgeschichte. 



1838. Hyperia, Milne-Edwards, Hist. nat. des Anim. sans vertebres, t. v. 



(ZOOL. CHALL. EXP. — PART LXVII. — 1888.) Xxx 173 



