r rrrm 



162 



STALK-EYED CRUSTACEA. 



connected with the eye^ on the doreal surface of the ocular peduncle. In 

 the two specimens from the ^'Albatross" collection of 1891, this ocellus does 

 not exist. At the corresponding point the integument of the peduncle 

 invades the eye to a slight degree, forming a notch in the otherwise entire 

 outline of the eye, but no part of the cornea is thereby cut off from the 

 main eye. 



Acanthephyra approxima Bate ? 



Hep. Challenger Macrura, p. 755, Plate CXXVI. Eig. 8, 1888. 



r 



Station 3384. 458 fathoms. 2 specimens. 



" 1 specimen. 



" 6 specimens. 



3388. 1168 



3403. 



384 



■I 



Bate's description of A, approxima was based on a unique specimen ob- 

 tained in Sarmiento Channel, Patagonia (400 fathoms). The rostrum of 

 this specimen is broken off just in front of the seventh dorsal tooth, which 

 lies directly over the posterior tooth of the lower margin. The four posterior 

 teeth of the upper margin are more closely set together than the three 

 anterior ones. In the specimens from the " Albatross " collection the rostrum 

 is a little shorter than the carapace, and is armed with from eight to ten 

 teeth above, four to seven below ; the posterior teeth of the upper margin 

 are not so closely set as in Bate's type specimen, so that the posterior tooth 

 of the lower margin underlies the fifth or the sixth superior tooth, or else 

 the interval between these teeth. The integument is thin and membranous 

 a character not specified by Bate in his description of A. approxima. The 

 posterior angles of the pleura of the fifth abdominal segment are rather 

 sharper than indicated in Bate's figure, and the eye is narrower. The telson 

 is furnished with a few pairs of very minute dorsal spines, which tend to 

 become obsolete in many specimens. 



3 



E 

 ^ 



i 

 \ 



Acanthephyra cristata Fax. 



Plate XLIIl, Fig. l,r,l\ 



Bull. Mus. Comp. ZooL, XXIV. 200, 1893. 



The rostrum, measured from the tip to the hind border of the orbit, is 

 three quarters the length of the rest of the carapace, measured from the 

 hind wall of the orbit to the hind border of the carapace in the median 

 dorsal line ; its upper margin rises into a prominent crest, w^hich continues 

 backward over the anterior part of the gastric region, and sinks into a blunt 



Tf 



