

RECENT BRITISH OSTRACODA. 



423 



2. Cythemdea papillosa, Bosquet. (Plate XXVIII. figs. 1-6, and Plate XL. fig. 1.) 



Cytheridea papillosa, Bosquet, Entom. fossil, des ten. tertiair. de la France, p. 12, pi. ii. figs, ba, b, c, d. 

 Cythere Bradii, Norman, Brit. Assoc. Report, 1864, p. 192. 



debilis, Norman, Nat. Hist. Trans. Northumb. & Durh. vol. i. p. 15, pi. v. figs. 5-8, and note, p. 28. 



Cyprideis Bairdii, G. O. Sars, he. cit. p. 52. 



Scandinavian type. Distribution: Recent — Baffin's Bay, Norway, Great Britain. Fossil— Glacial 

 deposits and raised beaches, Scotland and Norway ; tertiary, France and Belgium. 



Valves of the female, as seen from the side, oblong, slightly higher in front than behind, 

 height equal to more than half the length; the postero-ventral termination somewhat 

 angular. Anterior margin obliquely rounded; posterior sloping steeply with a gentle 

 curve from above downwards, terminating below in an obtusely rounded angle. Superior 

 margin very slightly arched, inferior straight or indistinctly sinuated in front of the 

 middle. Outline, as seen from above, ovate, tumid, rounded at the extremities the 

 anterior of which is the narrowest; greatest width behind the middle, equal to half tbe 

 length; a slight longitudinal depression along the junction of the two valves behind the 

 middle. End view nearly circular. The shell of the male is much more elongated, and 



rly equal in height throughout, the height much less than half the h 



fei 



margin more decidedly sinuated. Surface of the shell smooth and shining, cream- 

 coloured, clouded with reddish brown on the dorsal aspect ; beset with distant circular 

 papilla*. Lucid spots arranged in a transverse row of four, with two others at a consider- 

 able distance in front. Terminal hinge-processes distinctly crenulated, the intervening 

 portion more slightly so (Plate XXVIII. figs. 5«, b). Terminal joint of the upper antenna 

 very short, not half the length of the preceding, armed with a long spine and two setae. 

 Spines of the third and fourth joints very robust, ensiform. Branchial appendage of the 

 mandibular palp bearing three seta?. First pair of feet very short, last two joints imper- 

 fectly separated ; terminal claw of the third foot much longer than the second joint and 

 finely ciliated on the margins. Eight foot of the first pair in the male very strong, sub- 

 cheliform, the last three joints coalescent, very thick and massive, and bearing on tin- 

 anterior mai-in a very stout, bearded linguiform process; terminal claw very strong and 

 bent almost at a right angle; "right foot of second pair very rudimentary, the terminal 

 portion composed of one very small ovate joint, bearing a short seta on the anterior 

 margin; » the left also different from that of the female, subprehensile, the last three 

 joints thickened ; terminal claw strong and doubly pectinate. Basal portion of the male 

 copulative organs subovate ; terminal portion bipartite, the anterior segment small and 

 obtusely triangular, the posterior larger and produced into an acuminate process. 



Length ^ - in., height J$ in. 



{Mr. J. G. Jeffreys) ; Bute, Loch Fyn 



Bab. In deep water, 10 to 50 fathoms. Hebrides, the Mnich Whumbe 



Cumbrae, and Ormeshead (Mr. D. Robertson); Aberdeenshire (Mr. Davson) , Norfhnmbc 



Durham 



E. C. Davison). 



estuary 



a*U~ seems to be a strictly aorthem specie, and on the <**££*£ 



of the north-east of England is one of the most abundant forms. In some ,Umm 



pecially in Loch Fyne, it occurs in great profusion 



and is associated with 



