Description of Genera itnd SiMcies. 15 



setigerous tip of the basal scale of the antenna so as to render the recognition of such 

 an organ impossible, even though it were present. 



The antenna; are usually preserved in such a way that the basal joints are concealed. 

 The opening of the green gland has, therefore, not been observed. The basal scale is 

 long (5 mm.) and extends beyond the peduncle of the antennules, and is constructed 

 like that of an ordinary caridean. Its outer thickened border ends in a spine, and the 

 terminal lobe which is attached by a transverse suture is radially corrugated and set 

 with a fine fringe of setaj. The inner edtre is also thin and corrugated and frinsied with 

 setEe. The peduncle of the Hagellum is composed of three joints, and the last is usually 

 bent off at about one-third of the length of the basal scale. The lash is massive and long, 

 over two-thirds the length of the body. In the specimen M. 8-i''', from which fig. 1 is 

 taken, the length of the body is o2 nnn.; that of the lash measured along its curve is 25 

 mm. 



The epistome or anterior lip (figs. 3, 7'^) is three-lobed and galeate. 



The mandible is made up of the usual body or palp. The body is large, but owing 

 to the specimens being usually crushed, the details of the molar portions and cutting 

 edges are obscured, although they are shown in figs. 1, 3, and 7\ The palp (figs. 1, 3) 

 is pediform, and (Consists of three joints, and is often well preserved owing to 

 its position. 



The hypostome or posterior lip (figs. 3, 7a) is moderately large and bilobed. 



The maxilla3 consist of the usual two pairs. The first pair are probably constructed 

 as in GnatJiophausia, for an organ with a similarly ciliated palp is found loo.se in specimen 

 M. 4807"^ (fig. 7*). The opposite corresponding one is also displaced and lies a little in 

 advance and on the other side. These have evidently been Ijroken away and displaced, 

 as all the organs in advance of the second maxilla." manifestly are. If these displaced 

 organs represent the first maxillae, then they are much more strongly set with blunt 

 bristles or teeth along the outer edges of the masticating loljes than those of Gnatho- 

 ■phausia. The second pair of maxilla; are nmch as they are in Gnathophansia. The 

 two- or three-jointed palp is even more ])ediform than in that genus. Traces of the 

 peculiar reniform ciliated exognathite also occur in this wonderful specimen 

 M. 4807''' (fig. 7-^). Taken in consideration with the emarginated recess already 

 mentioned as occurring in tlie anterior ])art of the carapace, as six )wn in specimen M. 4821*^ 

 (fig. 5), a strong link in the chain of evidence is added to coiniect up these ancient f<irms 

 with the recent Lophogastridie. The peculiar luminous organ wliicli accompanies this 

 set of appendages u\'(Tniithophii)ma has not been observed. 



The endopodite of the maxillipede is of the same general tumid form as in Gnatlto- 



