RECENT BRITISH OSTRACODA. 



119 



Hab. In depths of from 2 to 60 fathoms. Orkney {Mr. C. IV. Peach); Hebrides and the Minrh, 

 45-60 fathoms {Mr. J. G.Jeffreys); Tobermory at roots of Laminaria, Shetland, Isle of Skye 

 and Lamlash Bay, and Dogger bank {Rev. A. M. Norman) ; Aberdeenshire CO >t {Mr. Dawson) 

 Oban, Cumbrae, Ormeshead, Bute, and Campbeltown {Mr. D. Robertson) ; Northumberland ( tst 

 {G. S.B.) ; in shell-sand from Roundstone {Dr. Akock) ; off Lewis (N.B.), 59| fathoms {Admiralty 

 dredgings) *. 



33. Cythere (?) acehosa, n. sp. (Plate XXXI. figs. 55-58.) 



Carapace, as seen from the side, reniform, highest in the middle, greatest height equal 

 to half the length. Anterior extremity flattened, subtruncate, obtusely angular at its 

 junction with the dorsal margin; posterior rounded. Superior margin arched, highest in 

 the middle; inferior deeply concave, nearly parallel with the dorsal margin. The an- 

 terior, posterior, and postero-ventral portions of the margin are excessively compressed 

 and laminar. Outline, as seen from above, oblonsr, hexagonal; extremities suddenl) 



a» "~-"*'C5 



tapered, sharply acuminate, sides parallel; width equal to one-fourth of the length 

 Surface smooth ; colour yellowish, opaque. Animal unknown. 

 Length -fa in. 



Hab. Plymouth {Rev. A. M. Norman). 



This remarkable species ought very probably to form the type of a distinct genu 

 but as I have had no opportunity of examining the animal, it seems best pro tempore t- 

 place it in its present position. The only specimen extant is in the collection of th 

 Rev. A. M. Norman, and was obtained by the late Mr. Barlee from nets of trawlers 

 Plymouth. • 



Genus 2. Limnicythebe, Brady t 



Animal 



Shell irregularly tubercnlate or spinous, rather thin, and horny in texture, 

 like that of Cgthere, except that the antenna are armed with short sete instead ol 



spines. Upper antenna five-jointed, slender, the last joint much elongated the 

 penultimate excessivelv short. Postabdomen terminating in two rather stout seta. 



Inhabits fresb water 



more minnte 



Of this genus I have not yet seen the males ; but the structure of the upper entente, 

 together wlh the external characters of the carapace and the fre.hu ater hab, a seen, 

 to require that it should be placed in a distinct S enus. I thmk , very pr obabb ha 



examination than I have yet been able to make may reveal also other d* 



ferences than those here specified. 



,™ ^ vytv fios 15-18, Plate XXXVIII. 



1. Limnictthere inopinata (Baird). (Plate XXIX. hgs. 10, 



fig. 9, and Plate XXXIX. fig. 1.) 



Oytnere inopilmta , Baird, Brit. Entom. p. 1* ■* ~ *£ * ^ ^ ^ 



Valves, as seen from the side, reniform, rrregul, **£%*£[„ ,, th( , narlw ,. r 



latest height equal to more than half the ^P?", encirc i ing flange. Posterior 

 than the posterior, rounded, and produced into a flattened 



See Appendix. 



t Intellectual Observer, vol. xii. p 



. 121. 



3 h 2 



