Crangon and Galathea. 103 



Rostrum inoderate, quite smooth above, covered ivith scattered hairs, depressed 

 in the median line, terminating in a cylindrical tooth, winch is serrated on its edge 

 for its posterior half; borders of rostrum armed with two principal rounded teeth, 

 and two secondary and smaller; first pair ofchelipeds somewhat globose, moderately 

 broad, elongate, twisted ; sides of propodos parallel, toothed on outer margin, sur- 

 face sparingly tuberculated, hairy ; two succeeding joints strongly toothed on upper 

 surface; internal antennce surpassing rostrum ; ischium of external foot-jaw iiearly 

 double length of meros. 



The general form of this species is somewhat elongate, though less so than 

 dispersa, breadth at its broadest part being to the length as 2 : 7'5 ; the cara- 

 pace being not quite one-third longer than broad, and nearly of equal breadth 

 throughout. The carapace is rounded above and smooth, the transverse lines 

 ciliated at their borders, and produced into pointed teeth laterally ; it bears a 

 row of teeth behind the frontal region. The rostrum is concave, terminating 

 in a cylindrical pointed tooth, which is dilated and serrated at its base : the 

 serrations are not visible to the unassisted eye. Its margins are produced on 

 each side into four slightly flattened, curved teeth, the posterior two of which 

 are the smallest, and separated from the others by a short interspace. It sur- 

 passes the eyes by nearly their own length. The upper surface of the rostrum 

 and the frontal region are smooth, furnished only with a few scattered long 

 hairs. 



The internal antennse, when extended, surpass the ej'es. 



The external antennae are much shorter than the body, their third articula- 

 tion sparingly toothed. 



The first pair of chelipeds as long as entire body, moderately broad, the 

 propodos hairy, a row of strong, sharp-pointed teeth along its outer margin, 

 and a row of smaller ones internally, its surface covered with scattered mi- 

 nute squamiform tubercles, each set with long hairs, giving a hairy appearance 

 to the entire limb. The under surface is set with squamiform tubercles, bor- 

 dered with long hairs : the produced angle of the propodos bears a raised ridge 

 beneath its denticulated cutting edge. 



The dactylos is triangular, minutely dentelated at the outer border, and 

 bears a raised ridge above its cutting edge. Both it and the opposing process 



p2 



