1516 THE VOYAGE OF H.M.S. CHALLENGER. 



reaching beyond the inner ramus of the first pair ; peduncles of the third pair short, the 

 rami similar to those of the second pair, reaching considerably beyond them, the outer 

 very little shorter than the inner. 



Telson about as long as the breadth at the base, with slightly curved sides and 

 well-rounded apex, about half the length of the rami of the third uropods, much shorter 

 than the preceding composite segment. 



Length, about one-fifth of an inch. 



Locality.— Station 251, July 10, 1875 ; North Pacific; lat. 37° 37' N, long. 163° 26' W. ; 

 surface temperature, 65°. One specimen, male, not adult. 



Remarks. — The specific name refers to the ocean in which the species was found. 

 From Eupronoe minuta, Claus, it is distinguished especially by the more produced third 

 joint of the fourth perseopods, but also by the simple, not twisted, first joint of the first 

 gnathopods, and the more slender first joint of the fifth perseopods. 



Eupronoe minuta, Claus. 



1879. Eupronoe minuta, Claus, Die Gattungeu und Arten der Platysceliden, p. 28. 



1887. „ „ Bovallius, Systematical List of Amph. Hyper., Bihang till K. Svensk. 



Vetensk.Akad. Handl., Bd. 11, No. 16, p. 41. 

 1887. „ „ Claus, Die Platysceliden, p. 53, Taf. xiv. figs. 7-12. 



The fourth segment of the pleon shorter than the following composite segment. 



Eyes light-coloured in the specimens preserved in spirits. 



Upper Antennse. — The first joint of the peduncle broader than long, as broad as the 

 first joint of the flagellum. 



Lower Antennse. — Third (first free) joint of the peduncle swollen at the base, then 

 narrow, and the distal half again widened, the concave margin ciliated ; the fourth joint 

 longer than the third, and the fifth than the fourth ; the first joint of the flagellum a 

 little curved, about half as long as the last joint of the peduncle, the second joint very 

 slender, about a seventh of the length of the preceding joint. 



First Gnathopods. — The first joint more strongly twisted than in Claus' figure, the 

 portion below the twist much longer than broad ; the remainder of the limb nearly as in 

 Eupronoe pacijica. 



The Second Gnathopods and First and Second Perseopods nearly as in Eupronoe 

 pacijica. 



Third Perseopods with the first joint more elongate than in the species just 

 named, and the front margin concave at the centre instead of convex. 



Fourth Perseopods. — The first joint with slightly sinuous front margin, but without 

 a lobe at the base, the distal margin of the front part not oblique, reaching below the 



