4 



MR. G. S. BRADY'S MONOGRAPH OF 



much longer than the following two. Terminal claws very short, stout, and bent 



_,v,* „~~~ ...~ D 



linost at a right angle. "Distal portion of the male copulat 



projecting downwards 



Length 



Hub. Littoral. Dunstanborough (in tide-pools), Arranmore (in tide-pools), Roundstone Bay (1 fathom in 

 mud) (G. 8. />.) ; Poole ISay {Prof. T. Rupert Jones) ; Berwick Bay (Dr. Baird) ; Arran, Loch Carron, 

 Guernsey, Ilerm, and Falmouth (Rev. A. M. Norman) ; Macduff (Mr. D. Robertson) ; Girdler Sand, 

 (Mr. E. ('. Davison). 



This seems to be a strictly littoral species, and, though closely allied to the following, 



Is undoubtedly quite distinct. The principal points of difference are noticed under 

 IT. depress a. 



2. Xestoleberis depressa, G. O. Sars. (Plate XXVII. figs. 27-33.) 



XestoUberi* depressa, G. O. Sars, loc. cit. p. 68. 



? Cijthtrina impressa, Keuss, Foram. u. Entom. d. Kreidemergels v. Lemberg (Haidinger's Abhandl. 



vol. iv. 1850), p. 48, tab. vi. fig. 5. 



British type. Distribution : Recent—Norway, Great Britain, Ireland. Fossil— Glacial, Scotland and 

 Ireland; cretaceous, Lembcrg? 



Carapace of the female very tumid, breadth much greater than the height; as seen 

 from the side, subtriangular, greatest height somewhat behind the middle, equal to more 

 than half the length. Anterior margin narrow, rounded; posterior obtusely rounded 

 subtruncate; dorsal margin arched, sloping steeply in front, more rounded behind; 

 rentral slightly sinuated in front of the middle. Outline, as seen from above, tumid, 

 broadly rounded behind, widest at the posterior third, thence tapering to the acuminate 

 anterior extremity; greatest width equal to two-thirds of the length. End view subtri- 

 angular, angles well rounded, base nearly flat, height much less than the width. .Shell 

 of the male, as seen from the side, more elongated and triangular ; seen from above, ovate, 

 widest in the middle. Shell pellucid or opaque pearly white, often tinged at the anterior 

 extremity with reddish orange, very smooth and polished, iridescent, studded with small, 

 distant, setose papillae. The contact margins on the ventral surface marked with trans- 

 verse hair-like lines. "Antennae shorter than in the preceding species, second joint 

 of the upper pair shorter than the three following; terminal claws of the lower pair 

 long. Second joint of the last pair of feet about equal in length to the two following, 

 terminal claw very long and curved. Distal portion of the male copulative organs larger 



the preceding species, and broadly lanceolate." 



I ,en gt h A in 



»"" 4 4 



Mincl 



llab. In depths of 2-60 fathoms, and very rarely in tidal pools. Shetland, the 



Islands (Mr. Jeffreys's dredgings) ■ Scarpa Flow, Orkney (Mr. E. C. Davison) j Aberdeenshire coast 

 (Mr. Dawson) • Cumbrae, Peterhead, and Oban (Mr. D. Robertson) ; Devonshire coast, 60 fathoms 

 Mr. C. Spence Bate)-, Arran, Tobermorey, Loch Fyne, Stornoway (Rev. A. M. Norman) ; Northum- 

 berland and Durham coasts, 25-46 fathoms ; Galway, Roundstone, and Birterbuy Bays (G. S. B.). 



This is one of the most beautiful and most widely distributed of our marine Ostracoda. 



is mamly distinguished from the preceding species by the excessively tumid and 



depressed form of carapace in the female, by the absence of any black spot in front of 



