Indian Deep-sea Dredging. 191 



Family Glyphocrangonidae. 



Glyphocrangon, A. Milne-Edwards. 



The described species may, with the undescribed ones in 

 our collection, be artificially arranged in three groups as 

 follows : — 



(1) Species with the anterior moiety of the fourth or lateral 

 crest * produced and expanded at its anterior end into a single 

 huge vertically-compressed spine, which extends far beyond 

 the level of the supraorbital margin of the carapace, and with 

 the ridges and other elevations of the dorsal integument 

 generally more or less sharp and roughly tuberculose. — G. 

 aculeatum, A. M.-Edw., Spence Bate (=6r. Agassizii, S. I. 

 Smith), G. regalis, Spence Bate, and the following species, 

 which, though not belonging to last season's collection, we 

 think may be appropriately described here. 



10. \_Glypliocrangon investigator is , sp. n., Wood-Mason. 



Allied to G. aculeata and G. regalis, but distinguishable 

 at a glance from the former by the posterior moiety of the 

 third carapacial crest not being produced anteriorly into a 

 spine and from both by its much more tuberculose cephalo- 

 thorax and abdomen. From the latter, to which it is the 

 more nearly allied, it further differs in having the posterior 

 moiety of the third and fourth crests dentate and the lateral 

 margins and carinas of the telson sharply tuberculate for 

 rather more than the basal third of their length. From G. 

 spinicauda, A. M.-Edw., which, from Spence Bate's remark, 

 would appear also to belong to this group, it differs in having 

 the anterior moiety of the fourth crest undivided. 



" The ground-colour " of this striking form " is old ivory- 

 white with orange-white markings on tips of spines, &c. ; 

 the eyes are magenta." (G. M. Giles.) 



Twenty-four specimens, of which three are adult (two of 

 them ovigerous) females, were obtained at a single haul in 

 lat. 19° 35' N., long. 92° 24' E., in 272 fathoms. 



Length of rostrum 14*5 millim., of carapace from orbital to 

 posterior margin 25 millim., of abdomen 51 millim. ; total 



* To facilitate the following descriptions the carapacial crests, of which 

 there are seven pairs, may be named " dorsal," " subdorsal,'' " sublateral," 

 "lateral," " submarginal," "antemarginal," and " marginal," or may be 

 simply numbered 1 to 7 in the order of their succession from the mid- 

 dorsal line downwards on each side. The specific characters are taken 

 from the four uppermost. 



