200 DR. G. S. BEADY ON THE [Feb. 1, 



Anterior antennas short (PI. XX. fig. 11), the last four joints 

 bearing short and rather rigid setae : all the joints, except the first, 

 nearly equal in length. Posterior antennae four-jointed, stout, 

 sparingly setiferous, the penultimate joint bearing a very rudi- 

 mentary brush of about three short setae (PI. XIX. fig. 15). First 

 pair of feet with small bristles at the extremities of each joint 

 and at the apex along curved claw ; second pair with three long 

 subequal setae arising from the small terminal joint and a smaller 

 one from the penultimate joint (PI. XX. fig. 12). Abdomen 

 terminating in two stout nipple- shaped projections of the genital 

 lobe (fig. 13) which, however, are not so sharp nor so long as in 

 C. siliquosa. Caudal rami bearing two not very long curved 

 claws and near the middle of the posterior margin a single short 

 hair. 



I have met with three or four examples of this species in 

 examining afresh a gathering made at Belsay, Northumberland, so 

 long ago as 1866. The small lake from which the specimens came 

 has, however, been drained and, I believe, built over. Candona 

 caudata has not as yet been noticed in any other British locality ; 

 and Kaufmann is wrong in suggesting that the species referred 

 to C. acuminata by Brady and Norman is identical with this 

 species, which is, however, very nearly allied to Candona elongata. 

 — so nearly that I was disposed at one time to unite the two 

 forms under one specific name. The characters upon which I 

 rely to distinguish them are as follows : — the shell in C. caudata 

 (as seen by transmitted light) is without any definite structural 

 character, but bears a few distant circular papillae, in C. elongata 

 it is coarse and vaguely areolated : seen externally the shell of 

 C. caudata has always a produced postero- ventral angle, which is 

 not seen in C. elongata. The anterior antennae in C. caudata are 

 not so stout nor are they so much dilated at the base as in the 

 other species, and the joints of the last pair of feet are longer ; 

 lastly the caudal rami are more slender and the marginal seta is 

 situated near the middle of the ramus. It is possible that the 

 specimen figured by Brady and Norman as perhaps the young- 

 male of C, elongata may belong to C. caudata. 



Candona siliquosa, nom, n. (Plate XXI, figs. 9-14; Plate 

 XXII, figs. 9, 10.) 



1889. Candona acuminata Brady &, Norman, (2) Part i. p. 104, 

 pi. ix. figs. 9, 10, pi, x. figs. 5, 6. 

 (Not C. acuminata Fischer & G. W. Miiller.) 



The species referred by Brady and Norman to C. acuminata 

 Fischer differs very considerably from the true acuminata, not 

 only in the form of the shell but in certain points of internal 

 anatomy. I am indebted to Dr. G. W. Miiller for specimens of 

 that species which put the matter beyond doubt. Our British 

 spesimens are very similar in general aspect as well as in internal 

 structure to C. caudata Kaufmann, but they do not show the 

 characteristic backward production of the shell, and the posterior 



