125 



and the coxa and basis of the 2nd maxillae, are much reduced. The exopoditee 

 of all the max illi pods end in slender flagella. The terminal joint of the 2nd 

 maxillipeds articulates as usual along the distal part of the inner border of 

 the propodito as if it were a complemental piece of that segment. 



The external maxillipeds are pediform and stout : their dactylus is thickly 

 beset with movable spines : two processes of their coxopodite together form a 

 sort of collar, which firmly catches a process of the neighbouring margin of the 

 carapace. 



No exopodites are present on any of the thoracic legs. 



The 1st pair of thoracic legs, which are stouter and shorter than the others, 

 arc sub-chelate and have the antero-internal angle of the ischium acutely pro- 

 duced : the short claw-like dactylus folds against the setose dorsal border of the 

 propodite, but there is no spine there to serve as a fixed finger : the propodite is 

 much broader at base than at tip. 



The 2nd pair of legs are minutely chelate and have a flexible multi-articu- 

 late carpus. 



The last three pairs of legs, which are similar in size and stoutness, are a 

 little stouter than the 2nd pair. 



All the abdominal appendages are biramous, and their endopodites (except 

 in the first pair of the female) have a styliform internal appendix at base : in the 

 second pair of the male there are two such lobes. 



Eggs few and large. 



The GlyphocrangomdiB of these seas fall into two groups as follows : 



I. Tlic eyes are large and deeply pigmented (purple in spirit) : there 



are 1 1 branchiae on .either side ... ... ... GLYPHOCRANGON. 



II. The eyes are small and unpiamentHd (pale yellow in spirit) : there 



are only 9 branchiae on either side ... ... ... PLASTOCRANOON. 



GLYPHOCRANGON, A. Milne Edwards. 



'..>crnnjr<m, A. Milne Edwards, Ann. Sci. Nat.. Zool., (6) XI. 18<<1, p. 3 : S. I. Smith, in Ho|H>rt I'. S. 

 b'ish. Comm. for ISMi. p mil: Spenco Bate, Challenger Crustacea Macrura, p. 503. 

 Rhacocaris, S. I. Smith, Bull. Mas. Comp. Zool. X. 1SS2-83, p. 41. 



Cervical and gastro-hepatic grooves broad and deep. Besides a fine supra- 

 marginal crest, running from the anterolateral or branchiostegal spine to the 

 posterior border, and besides three incomplete longitudinal ridges on the infero- 

 lateral aspect of the carapace, the carapace has, on either side, 4 prominent 

 longitudinal ridges. The 1st or uppermost of these the " dorsal " crest runs 

 from the posterior border of the carapace, to the base of the rostrum, and is 

 usually serrated: the 2nd, or " subdorsal " crest, which also is usually in whole 



