338 Mr. A. E. Verrill on new American 



dage, its edges strongly serrate, especially in front, capable of 

 folding up like a fan when not in use. The claspers have a 

 much swollen basal joint, a strongly serrate tooth on the inside 

 of the base of the second joint, which beyond this is slender 

 and regularly curved. Egg-pouch long-oval, large and thick ; 

 caudal appendages large ; male organs and branchi^ peculiar. 

 G. diaphanusy Prdv., inhabits freshwater pools in France, 

 Switzerland, and England. It is well described and figured 

 in Baird's ' British Entomostraca,' p. 39, tab. 3 & 4. 



Branchijyus vernalis^ Verrill, sp. nov. 



Form rather stout, large ; the full-grown females are 23 

 millim. ('Ol inch) long, the abdomen being 14 millims. ; and 

 Q)'5 millims. wide across the branchial organs in their natural 

 position ; breadth of head across the eyes 4 millims. A large 

 male is 22 millims. ("87 inch) long, the body 12 millims. ; 

 the breadth of head across eyes 5 millims. ; the entire length 

 of claspers 8 millims. The claspers are very large and strong, 

 the basal joint much swollen, with a soft integument, capable 

 of retracting the basal portion of the second joint into itself by 

 involution of its outer edge ; the second joint is elongated, 

 broad and stout at base, with an angle on the outside, 

 from which it rapidly narrows by strongly concave outlines 

 on each edge, but most on the outside ; at the constricted 

 portion, not far from the base, it bears a large, strong, very 

 prominent, crooked, bluntly pointed tooth, which is directed 

 inward and backward, not serrate on its outer side ; beyond 

 the tooth the rest of the joint is long and rather slender, curved 

 outward and forward at base, having just beyond the tooth on 

 the inside a distinct but very obtuse rounded angle, from 

 which the outline slightly curves inward to near the tip, which 

 is a little dilated and recurved. The basal portion, including 

 the tooth, is retracted into the first joint in some specimens. 

 On the front of the head, between the basal joints of the 

 claspers, are two flat, short, lanceolate, ligulate, fleshy pro- 

 cesses, with finely serrate edges, usually coiled down, but, 

 when extended, scarcely more than half as long as the basal 

 joint of the claspers. Antennse small and very slender, taper- 

 ing, reaching a little beyond the eyes. Caudal appendages 

 long, rather narrow, slightly SAvollen at base, gradually taper^ 

 ing to the acute tips, and bearing along the sides, except at 

 base, very numerous long plumose setse. Egg-pouches short, 

 broad-oval, nearly as wide as long, slightly three-lobed pos- 

 teriorly, the central lobe largest, sides extended and largely 

 adherent to the sides of the abdomen ; length 4 millims., width 



