RECENT BRITISH OSTRACODA. j." 



may be employed to puncture the epidermis of alg», and afterwards to al.si ract the 



of the plant; but in this case one fails to see any use for the exceptionally large poi 



J 



glands and urticating setae with which the members of this genus are arm.' d. A [together 

 it appears to me more conformable to what we know of the general habits of the 

 Crustacea, and more fully explanatory of the peculiarities of the Paradoxostomata, if ire 

 suppose their diet to consist of microscopic animalcula, rather than the jui( x» oi al-pe 

 or of animals much higher in organization than themselves. 



1. Paradoxostoma yariabile (Baird). (Plate XXXV. figs. 1-7,12-17, and Plate XL I. 



fig. 8.) 



Cythere variabilis, Baird, Trans. Berw. Nat. Club, i. 98, tab. iii. figs. 7 a, b (1835), and ii. 153; Hrit. 



Entom. p. 170, tab. xxi. figs. 10, 11. 

 Paradoxostoma variabiles G. O. Sars, loc. cit. p. 93. 

 ? Cythere flavida, Miiller, Entomostraca, p. 66, tab. vii. figs. 5, 6. 



British type. Distribution: Recent — Baffin's Bay, Britain, Norway. Fossil— Glacial and raised 

 beaches, Norway, Scotland, Ireland. 



Carapace of fhe female, seen from the side, elongate-ovate, much attenuated in front, 

 highest behind the middle; greatest height equal to not more than half the length. 

 Anterior margin narrowly, posterior very broadly and obtusely rounded, often slightly 

 angulated above ; superior margin well arched, sloping rather steeply in front ; inferior 

 straight or but slightly convex in front, much more convex behind. Outline, as seen 

 from above, compressed ovate, tapering gradually to each extremity; greatest width 



behind the middle, and equal to more than one-third of the length 



pointed 



The shell of the male is similar to that of the female. Valves pellucid, white, slightly 

 olivaceous or ochreous ; marked with arborescent black or violet ] latches, and often with 

 two more or less distinct dark transverse bands. Second and fourth joints of tin* upper 

 antennae nearly equal in length, longer than the third, and very much longer than tin 

 united lengths of the fifth and sixth. Terminal claws of the lower antenna) very short 

 and subequal ; flagellum robust, Particulate. First pair of jaws having only three 

 Particulate lobes, two of which are nearly equal in length, the other more than twice 

 as long. Last joint of the third pair of feet very long and narrow, densely ciliated on 

 the anterior margin. Basal segment of the male copulative organs exceedingly large 

 and rounded, distal segment very small and twisted, bipartite, the anterior portion 

 narrow and obtuse, the posterior expanded and acuminate. 

 Length A A in. 



uid Dover (Dr. Baird) ; plentifully in rock-pools on the Northumberland and Durham 

 shell-sand from Guernsey (G. S. B.) ; at roots of Laminaria, Tobermory ; Isle of 

 ,d He,™ (Re,. A. M. Norman) ; Falmouth (Rev. Mr. Barlee) ; dredged off Umbra, 



O u " 3 5 3 2 



in 



(Mr 



It seems to me very probable that (as has been suggested by Sars) Miiller s description 

 of Cythere flavida has been taken from the ochreous variety of this species ; but, con- 

 Bering the doubt which must attach to this supposition, and the fact that the name 



3 o 



VOL. XXVI. 



