STALK-EYED CRUSTACEA 107 



4. Lambrus (Pisolambrus) nitidus. 



Lambrus nitidus .... Miers. 

 Pisolainbnis nitidus ... A. Milne Edwards. 



The carapace is wider than long, little raised, but 

 rounded above ; the branchial regions are prominent and 

 distinctly separated from the hepatic regions. The test 

 magnified is finely punctuated, but to the naked eye 

 it is smooth and shining. There are neither granulations 

 nor tubercles. The front, more advanced than the eyes, 

 forms a trilobed and slightly depressed lamina in the 

 middle line. The antero-lateral border, very bowed and 

 slightly laminate, is obscurely divided by fissures into 

 very faintly marked teeth ; it is continued directly with 

 the postero-lateral border, which is also fused with the 

 posterior border. The external maxillipedes have on 

 their third joint a line of tubercles which limits on the 

 inside the efferent canals of the branchial chambers. 



The first pair of legs is very thin and long ; the 

 fourth joint, smooth in its whole extent, has its edges 

 finely toothed like a saw ; the fifth joint is small, and 

 has three longitudinal lines of granulations. The hand 

 is smooth on its faces, but has its superior border cut 

 into ten or twelve slightly projecting saw-like teeth, at 

 the base of which is a small group of granulations. The 

 first, which surmounts the movable finger, is in the form 

 of a spine. The external border has about twelve much 

 smaller teeth, at the base of each is a small group of 

 granulations forming a line parallel with the border. 

 The inferior border is finely serrated. The walking legs 

 are very thin ; the extremity of the first pair does not 

 reach the articulation of the arm with the forearm. 

 The sternal plastron and the abdomen are smooth. 

 Range. — Barbados, St. Vincent, Santa Cruz. 



