158 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



which extends backward nearly to the posterior border of the carapace. Antero- 

 lateral margins of the carapace angulated below the orbit. Telson much 

 shorter than the appendages of the sixth abdominal somite, broad, with a pair 

 of dorsal longitudinal ribs, abruptly contracted a short way beyond the mid- 

 dle; tip truncate, setiferous. 



The eyes are absent ; their peduncles are transformed into a pair of closely 

 apposed trihedral processes, with acute and somewhat divergent tips. The 

 first segment of the antennule is very long, reaching nearly to the end of the 

 antennal scale; the second and third segments are, on the other hand, very 

 short, the third bearing two flagella, the outer of which is very much shorter 

 than the inner. The antennal scale is long and narrow, its outer margin 

 lightly concave. 



Length, 28 umi. 



Station 201. OflF Martinique. 565 fathoms. 1 9 . 



The rostrum is proportionally smaller than in P. ommfltosteres Wood-Mason,^ 

 while the dorsal teeth of the carapace are larger, more numerous, and extend 

 farther back on the cephalothorax ; the telson is shorter ; the antennal scale is 

 longer than the proximal segment of the antennule. According to Wood- 

 Mason, there is no trace of eyes or eye-stalks in P. ommatosteres. In P. pecti- 

 nata there are distinct rudiments of the eye-stalks, as above described. 

 P. ommatosteres comes from the Andaman Sea, 405 fathoms, and the Bay of 

 Bengal, 200-350 fathoms. 



Glyphocrangon aculeata A. M. Edw. 



Glyphocrangon spinicauda A. M. Edw. 



1 Ann. Mag. Nat. Hist., 6th ser., Vol. VIIL p. .362, 1891 ; Journ. Asiatic Soc. 

 Benizal, Vol LXIII. p. 152, 1894; 111. Zo51. R. I. M. S. "Investigator," Crust., PI. 

 IX. Fig. 4, 1895. 



