RECENT BRITISH OSTRACODA. 



375 



other British Cypris, and I cannot identify it with any of the numerous species described 

 by continental authors. 



21. Cypris Joanna, Baird. 



Cypris Joanna, Baird^ Trans. Berw. Nat. Club^ i. p. 99j t. iii. fig. 8^ 1835, and Brit. Entom. p. 155, t. xviii. 

 fig. 5. 



" Shell rounded, ovate, narrower anteriorly than posteriorly, of a brown colour, with 

 an orange mark across the back of the shell and the lower margin. Shell beset all round 

 with rigid hairs, and covered with minute black points or dots. Approaches the C. pilosa 

 of Miiller, but is smaller, and is otherwise distinguished from it by the orange mark 

 across the back, and by not being glabrous, but marked all over with black, roughish- 

 looking points. It is a little longer than C. ni'muta. Sab. Pool of water on one of the 

 Lammermuir Hills, near Abbey St. Bathans, Berwickshire; August 1835." — Dr. Baird. 



I have never found this species, nor seen specimens of it. Can it be a moorland form 

 of C. Icevis ? 



Genus 2. Cypridopsis, Brady*. 



Like Cypris^ except that the postabdominal rami are rudimentary, consisting of two 

 slender setiform prolongations (Plate XXXVI. figs. 9, 10), thickened below and rising 

 together from a common base. The second feet are terminated by a short hooked claw, 

 and two moderately long setse. 



The three species belonging to Cypridopsis have not much in external appearance to 

 separate them from section c of the preceding genus ; but the structure of the abdo- 

 minal rami is of itself a character of sufficient importance to form a generic distinction. 

 The characters of the second feet are the same as found in section a of the genus Cypris. 

 The males have not yet been met with. 



1. Cyprldopsis vidua (MiiUer). (Plate XXIV. figs. 27-30, 46.) 



Cypris vidua, MiiUer, Entomostraca, p. 55, tab. iv. figs. 7-9 ; Baird, Brit. Entom. p. 152, t. xix. figs. 10, 11 ; 

 Lilljeborg, De Crust, ex ord. trib. p. Ill, tab. x. figs. 10-12. 



sella, Baii'd, Brit. Entom. p. 158, t. xix. figs. 5, 5a. 



Monoculus vidua, Jurine, Hist, des Monocles, p. 175, pi. xix. tigs. 5, 6. 



Shell ovoid, very tumid: greatest height in the middle, equal to two-thirds of the 

 length ; extremities rounded, the anterior much the broadest. Dorsal margin arched 

 and highest in the middle; ventral margin very slightly sinuated. Seen from above, 

 the carapace is ovate, exceedingly tumid, narrowed in front, and broadly rounded 

 behind, widest a little behind the middle; length about one-third longer than the 

 breadth. The end view is very broad in proportion to its height, the diameter from 

 side to side being nearly one-fifth more than that from base to apex. The setse of the 

 lower antennae reach much beyond the apices of the claws. The short articulate 

 appendage of the third joint bears at its extremity a very distinct subovoid hyaline vesicle 

 (fig. 46). The limbs are uniformly very robust. The shell is smooth and mostly marked 

 with small impressed puncta : colour dull white, with three black bands running trans- 

 versely from the dorsal margin to the middle of each valve. The anterior band is the 



* Intellectual Observer, vol. xii. p. 117. 



