128 A Synopsis of the Recent British Ostracoda. 



branch of the lower antenna in the male elongated; in the 

 female scarcely longer than the succeeding joints ; secondary 

 branch in the male (Fig. 13) robust, subchelate, terminal joint 

 slender, curved upwards ; in the female simple, triarticulate, 

 last joint setiform. Antepenultimate joint of the mandibular 

 foot shorter than the following joint, bearing three long sub- 

 equal curved setse, two of which are plumose; last joint very- 

 short, armed with a curved claw and several setae. First 

 maxilla, consisting of a broad subquadrate or crescentic 

 lamina, densely clothed on its distal side with long bristles ; 

 second pair swollen at the base, suddenly narrowed toward the 

 apex, interruptedly setose; third narrow, uniformly setose. 

 Oviferous foot terminating in two equal dentate lips (Fig. 14), 

 and bearing about six pairs of spinous setae. Shell elongated, 

 fusiform, or subcylindrical, smooth ; beak rounded, and not at 

 all produced ; notch narrow. Animal swimming freely. 



C. Ma-rice (Baird), teres (Norman). — Mr. Robertson takes 

 these species in the Frith of Clyde (though never very 

 abundantly) by means of the tow-net, during the night. It 

 would seem, indeed, that these animals do not come to the 

 surface except after sunset. This observation suggests that 

 possibly in fresh-water lakes something might be done by 

 naturalists during the "• wee sma' hours ayont the twal." 



Beadycinetus, G. 0. Sars. — Terminal setae of the upper 

 antenna short and subequal. Secondary branch of the lower 

 antenna in the female (Fig. 15) small and biarticulate, the last 

 joint obtuse, and bearing at the apex a flexuous seta ; in the 

 male larger, three-jointed, the last joint long and membrana- 

 ceous, terminating in two short setge. Mandibular feet (Fig. 

 16) armed with a bifurcate process, in front of which are three 

 toothed spines. Second pair of jaws having a strong mandi- 

 buliform appendage, composed of two robust tooth-like pro- 

 cesses. Eyes small, and of pale colour. Animal mostly 

 crawling slowly amongst mud. Shell much thicker and stronger 

 than in the preceding genera, produced in front into a large 

 beak, with a deep subjacent notch. 



B.Brenda (Baird), Mac Andrei (Baird). 



Family — Conchoeciadje. 



Conchoecia, G. 0. Sars. — This is the only genus of the 

 family, and is sufficiently described previously (pp. 115, 116). 



One specimen only has been seen in Britain, and is pro- 

 bably referable to 0. obtusata, G. O. Sars. It was found by 

 the Rev. A. M. Norman, in sand dredged off Shetland. 



