Crangon and Galathea. 91 



long. I have, however, met two small specimens out of some hundreds exa- 

 ,mined, which, while agreeing more closely with this species than any other, 

 differ in having the beak perfectly smooth. There are other characters in the 

 squamulation of the hands in which they also differ. If a variety of squamifera, 

 it is certainly a rare one, as all the other specimens I have met agree with each 

 other in the characters given above. Tlie margins of the beak are produced 

 into eight teeth, four on each side, which are cylindrical and sharp, the posterior 

 pair the smallest. The rostrum surpasses the eyes by about the length of the 

 peduncle of the latter. 



The internal antennse, with the third joint short, dilated externally, and 

 strongly toothed anteriorly. 



External antennsB equal to the body from rostrum to telson ; basal articula- 

 tions short ; the filament very long. 



The first chelipeds exceed the cephalo-thorax and abdomen by one-fifth of 

 their own length, are moderately broad, generally somewhat flattened. Varie- 

 ties occur in which tliey are somewhat globose. The propodos finely serrate 

 on outer margin, and obsoletely so on inner, especially in young specimens; its 

 upper and under surfaces densely covered with squamiform tubercles, which 

 ai'e dentelated at the free edges, and ciliated. The dactylos and opposing pro- 

 cess of propodos are nearly parallel : varieties occur in which they are curved, 

 leaving a broad Interval between them, the tips alone touching. The meros is 

 squamulate, and armed with strong teeth along its inner edge. The carpus 

 is strongly toothed internally, a few spiniform teeth being scattered through 

 the squamiform tubercles on its upper surface. These limbs are remarkably 

 easy of replacement, the animal casting them at once if seized by them. I pos- 

 sess a specimen in which both the chelipeds had been cast, and are now re- 

 placed by a very short pair, still soft, and only half the length of the extei-nal 

 foot-jaws. I have constantly seen the animal in good healtli and condition, 

 though wanting these organs. The second and third pairs of chelipeds are 

 more or less serrate along their upper edge, and squamulate. The fourth pair 

 bears a row of stiff hairs along its upper margin ; its under margin is serrated. 

 The fifth pair of chelipeds is as long as the carapace, smooth, terminating in a 

 small blunt hand ; it is generally carried folded up. The only use I have seen 

 the animal make of these limbs is in combing out and arranging the fringes of 

 the branchi^. 



