24 



Long, maris et foeminfe 12—15 millim. 



Branchipus lacunce, Guerin, Iconog. Regn. Anim. Crustaces, 39. 

 t. 33. f. 4, 4 a. 



Hah. In stagnis prope " Fontainebleau ; " M. Guerin. 



This species, which is briefly described by M. Guerin in the ' Icono- 

 graphie du Regne Animal,' is found in little pools of water near Fon- 

 tainebleau. It is transparent, but is smaller than the preceding spe- 

 cies, and is distinguished from it by the shape of the inferior anteimse 

 or cephalic horns in the male. These organs are of two joints ; the 

 basal one large, and armed on its internal edge with several stout 

 teeth or lobes ; the second much smaller, cylindrical, bent suddenly 

 back upon the first, and sinuated, or as it were slightly toothed at 

 the apex. The long ribbon-like appendage which springs from the 

 base of the first joint appears to have only two very short processes 

 attached to it, instead of the four long finger-like bodies, and the 

 fan-shaped body is not represented at all ; but this part of the head 

 is not sufficiently described by M, Guerin to enable me to satisfac- 

 torily ascertain its exact structure. 



3. Chirocephaltjs claviger, Fischer. Antennis inferioribus 

 maris validis, articulo basali magno, terminaJi parvo, ad basin 

 dentato, ad apicem clavato ; antennis superioribus quadri-arti- 

 culatis ; fronts rotundato. 



Long. 8-10 lin. 



Branchipus claviger, Seb. Fischer, Middendorflf's Sibirische Reise, 

 ii. Wirbellose, 149. t. 7. f. 1-1 1 (1851). 



Hab. In fluvio Taimyr, in Siberia ; Middendorff. 



This species, which is about 8 or 10 lines long, was discovered by 

 M. Middendorff in a pool of water by the river Taimyr in Siberia. 

 The inferior antennae of the male are strong organs ; the basal joint 

 being stout and fleshy and the terminal narrow, provided with about 

 a dozen small teeth at its base, and ending in a club-shaped extre- 

 mity. The digitiform appendages are more numerous apparently 

 than in C. diaphanus. They arise from the extremity of the long 

 riband-like appendage, instead of from its base, and each of them 

 has several teeth on the sides and apex. In the female these an- 

 tennae are small, narrow and sharp-pointed. The superior antennae 

 are divided into four articulations. 



4. Chirocephalus birostratus, Fischer. Antennis inferio- 

 ribus maris validis, articulo basali magno, tertninali mediocri, 

 prope basin processu elongato armato, ad apicem uncinato. 



Long. 10-12 lin. 



Branchipus birostratus, Seb. Fischer, Middendorff's Sibirische 

 Reise, ii. t. 7. f. 12-16 (1851). 



Hab. Prope urbem " Charkow " in Russia ; Fischer. 



This species is about 10 or 12 lines long, and was found by 

 Fischer in the neighbourhood of the town of Charkow, in Russia. 

 The inferior antennae of the male are strong organs, the basal joint 

 stout and fleshy, the terminal of moderate size, having, springing 



