Feb. 1, 1870.] 



HARDWICKE'S SCIENCE-GOSSIP. 



27 



Pallenepygmaa (fig. 35), as exhibiting some peculiar 

 points in a marked degree. Placing it in a shallow 

 cell, so as to keep its limbs extended, a power of 

 40 or 50 diameters, illuminated by the spot lens or 

 Wenham's paraboloid, will be sufficient to bring out 



thorax, the two terminal joints forming a powerful 

 sickle-shaped claw. Projecting upwards from the 

 posterior extremity of the thorax is what looks like 

 a little tail : this is the rudimentary abdomen. At 

 the anterior extremity of the thorax is seen .the 



Fig. 34. Larva of Achelia after first moult, x 200. 



Fig. 35. Pallenepygmaa, x 16. 



the most prominent points of its structure. The tho- 

 rax (figs. 37 and 38) is narrow, and'eomposed of four 

 segments, or probably five, the two anterior being 

 fused into one. Into each segment is articulated a 

 pair of long and stout legs, each composed of nine 

 or ten joints, and about four times the length of the 



head, which is about half its lengtb, somewhat 

 cylindrical in form, and terminated by a triradiate 

 mouth (fig. 41 a), which, according to Dr. Carpen- 

 ter, is provided with cilia. Viewed from beneath, the 

 head appears to be traversed throughout its length 

 by a sort of suture dividing it into two parallel 



C 2 



