RECENT BRITISH OSTRACODA. 



441 



sinuated ; the valves are produced laterally, so as to form, at the infero-posteal angle, a 

 sort of projecting ala. Outlme, as seen from above, compressed hastate, greatest breadth 

 in the middle, and equal to rather more than one-third of the length ; anterior extremity 

 obtusely pointed, posterior rectangular, mucronate. End view ovate. Surface coarsely 

 punctate ; areola as in the preceding species, with the same hair-like lines radiating from 

 its borders. Colour pale or deep golden yellow. 

 Length in. 



Hab. Birtci'buy Bay, 10 fathoms, in mud, and in shell-sand from South Wales (G. S. B.) ; Lerwick, 

 Shetland, Peterhead [Mr. D. Robertson) ; the Minch [Mr. J. G. Jeffreys) ; Plymouth, and in rock- 

 pools, Arran, N.B. [Rev. A. M. Norman). 



Well characterized by its excessively compressed dorsal outline, the posterior angula- 

 tion, and the coarse purjctation of the shell, also by the very prominent beak of the 

 supero-posteal angle. I have had no opportunity of examining the animal of this species ; 

 nor have I seen any distinction in the carapaces, such as is usually characteristic of the 

 sexes. 



3. Cttheruiia striata, G. O. Sars. (Plate XXXII. figs. 26-29, 62, 64, 65.) 

 Cytherura striata, G. O. Sars, loc. cit. p. 74. 



British type. Distribution : Recent — Norway, Great Britain, Ireland. Fossil — Glacial, Norway, Scot- 

 land, Ireland. 



Carapace of the female, seen laterally, elongate sub quadrangular, about equal in 

 height throughout ; greatest height equal to less than half the length, evenly rounded in 

 front, produced behind into a large obtusely rounded median process ; superior margin 

 nearly straight in the middle, inferior gently sinuated, and ending behind in an obtuse 

 angle. Outline, as seen from above, oblong, sides nearly parallels width equal to less 

 than half the length, pointed in front ; posterior extremity almost rectangular, acuminate 

 in the middle. End view ovate, very tumid below. The tnale very narrow and elongate, 

 almost thrice as long as high, very tumid behind. The shell is very distinctly longitu- 

 dinally striated, with circular pittings in the grooves (fig. 62) ; areola obsolete ; colour 

 yelloMdsh. 



Length -^^^ in. 



Hab. Northumberland coast, 46 fathoms, Birterbuy Bay, 10 fathoms, and in shell- sand from South Wales 

 [G. S. B.) ; Lerwick and Cumbrae [Mr. D. Robertson) ; the Minch [Mr. J. G. Jeffreys) ; Plymoutli, 

 Portland, Isle of Skye, and Shetland [Rev. Mr. Barlee) ; Girdler Sand and River Eibble [Mr. E. 

 C. Davison) ; Stornoway, and in rock-pools, Herm [Rev. A. M. Norman). 



4. Cytherura lineata, n. sp. (Plate XXXII. figs. 30-34, 67.) 



Carapace of the female, as seen from the side, subovate, length equal to rather more 

 than twice the height, evenly rounded in front, produced into a short obtuse median 

 prominence behind. Dorsal margin gently arched, ventral nearly straight, terminating 

 behind in a minute tooth. Outline, as seen from above, ovate, widest in the middle, 

 about twice as long as broad, obtusely pointed in front, mucronate behind. End view 

 ovate, tumid. The male is rather more elongated and compressed, but in other respects 



VOL. XXVI. 3 o 



