648 On some Entomostiaca from Lake Michigan [August, 



ced to the right as a large, elongate, triangular process, somewhat hooked 

 tuced, but rounded and ex- 

 d at the tip, which is roughened before and behind. 



side of the fourth segment arises a stout process bearing, at its apex 



f.-hened behind, where it is opposed to the concave side of the 

 mus of the furca. From the same side of the fifth segment, a short flattened 



of a spatulate or paddle-like form, extends forward alx>ve or beyond ihe 

 d process just mentioned. 

 ! antennae are 25-jointeJ, and reach to the second segment of the abdomen. 



are especially prominent sensory hairs on the first and third joints, borne at 



1, the short, median joints common in this appendage being only obscurely in- 

 d. The mandible has but seven teeth, the first simple and acute, separated 



Jifid, the seventh entire and acute. The usual plumose bristle is replaced by a 



;le large and long terminal seta, strongly and sharply toothed externally and 

 >se within, and four long plumose setse attached to the inner margin. 



arge, broader than long, with the inner inferior angle produced downwards as 

 I, stout, curved process or arm as long as the two remaining joints. The sec- 

 ant is trapezoidal, shortest within. The thiid joint is about half as wide at 

 is the first, is straight without, with a sharp, small tooth at its distal third, and 

 U tip. On the inner margin this joint is at f,r,t dilate.! a little, and then deeply 



also obtained rarely by Mr. B. W. Thomas, from 

 Genus LlMNOCAlAr 



ndibles which 

 ngeTTvMen- 



