494 STALK-EYED CRUSTACEA 



almost obsolete finger embedded in a thick brush of 

 ciliated hairs. 



The ridge on the dorsal surface of the segments of the 

 abdomen is produced into a posterior tooth on the third 

 and following segments. The telson is dorsally flat or 

 grooved, and does not extend beyond the length of the 

 inner plate of the swimming organ. 



The gills are attached to the six posterior seg- 

 ments of the body wall, to the membrane between the 

 body and the first joint of all the limbs except the first 

 maxillipede and the last pair of legs, and to the first 

 joint of the first maxillipede. The two maxillipedes 

 and the first three pairs of legs carry each a branchial 

 plate. 



Range. — West Indies, South America, Tristan da 

 Cunha, New Guinea, Celebes, Japan ; in deep water. 



Synopsis of the Species. 



A. The rostrum is not as long as the basal antennal 

 scale. — (A^. gibbosus.) 



B. The rostrum is longer than the basal antennal 

 scale. — (/V. e/egaiis.) 



I. Notostomus gibbosus. 



Notostomus gibbosus ... A. Milne Edwards. 



The rostrum, not as long as the basal antennal scale, 

 has a dorsal crest which occupies about half its length 

 and is situated on the basal portion ; the terminal portion 

 is slender, and toothed above and below. The ridges on 

 the carapace are more or less parallel. The dorsal keel on 

 the abdomen is well marked, and the posterior projections 

 are well developed. 



Range. — Grenada. 



