135 

 81. Grlyphocrangon (Plastocrangon) caeca, Wood-Mason. 



Glyph ocrangon aeca, Wood-Mason, Ann. Mag. Nat. Hist,. Nov. 1891, p. 358. 

 Illustrations of the Zoology ok the Investigator, Crustacea, Plate VII. Piu. 1. 



The rostrum, the free portion of which is about three-fifths the length of 

 the rest of the carapace measured in the middle line, is traversed dorsally by a 

 fine median ridge, on either side of which, anteriorly, is a row of pits, most 

 distinctly impressed in the male. The two usual teeth are present on either 

 border, the posterior being rather blunt. The transverse groove that separates 

 the rostrum from the gastric region is faint. Orbital spine very small. 



Of the crests of the carapace, all of which except the anterior half of the 

 3rd or " dorso-lateral " crest are present, the " dorsal " and " subdorsal " are 

 represented by rows of tubercles, and all the others are smooth. The anterior 

 half of the 4th or "lateral " crest ends in a huge vertically-compressed wing- 

 like spine, lying outside the branchiostegal spine and projecting far beyond 

 the anterior border of the carapace : behind and above this spine is a smooth 

 oval hepatic swelling. The surface between the crests of the carapace is smooth 

 except for a double row of granules lying between the " dorsal " crests in their 

 anterior or gastric portion, and for a few granules defining certain parts of the 

 cervical groove. 



The abdomen is carinated in the same general way as in Q. investigatoris, 

 but the carinse are all less sharply cut, those of the 2nd, 3rd and anterior half 

 of 4th terga are obsolescent, and that of the 6th tergum is not divided into 

 two parts by a notch. Except for some oblique crests on the 5th and 6th terga, 

 and for some small low tubercles lying in a longitudinal series on either side of 

 the median carina, the abdominal terga are smooth. 



The eyes are small, their major diameter being contained from 4 to 5 times 

 in the length of the free portion of the rostrum, and they may be unequal : in 

 spirit they are the same colour as the rest of the integument. 



The antennular peduncle does not reach the tip of the antenna! scale : the 

 flagella are much longer than the peduncle, especially in the male, in which sex 

 also the outer flagellum is foliaceously expanded in its proximal half. 



The antennal scale is broadly oval, its breadth being more than two-thirds 

 its length, and its dorsal surface is finely hispid. 



The external maxillipeds are slightly stouter than the 1st pair of legs and 

 reach to the middle of the antennal scale. 



The 1st pair of legs, with the dactylus extended, hardly reach the end of 

 the penultimate joint of the external maxillipeds. The 2nd pair of legs are 

 shorter than those behind them, and almost reach the tip of the antennal scale : 

 they are distinctly longer in the male than in the female. 



