438 



MR. G. S. BRADY'S MONOGRAPH OF 



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

 almost at a right angle. " Distal portion of the male copulative organs narrow, lingui- 

 form, and projecting downwards." 

 Length 5-5- in. 



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

 mud) (G. S. B.) ; Poole Bay {Prof. T. Rupert Jones) ; Berwick Bay (Dr. Baird) ; Arran, Loch Carron, 

 Guernsey, Herm, and Falmouth {Rev. A. M. Norman) ; Macduff [Mr. D. Robertson) ; Girdler Sand, 

 [Mr. E. C. 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 

 X. depressa. 



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



Xestoleberis depressa, G. O. Sars, loc. cit. p. 68. 



? Cytherina impressa, Reuss, 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, Lemberg? 



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 ; 

 ventral 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. "Antennse shorter than in the jireceding 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 

 than in the preceding species, and broadly lanceolate." 



Length ^ in. ;\ 



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

 Islands {Mr. Jeffreys's dredgings) ; Scarpa Flow, Orkney {Mr. E. C. Davison) ; 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 l)eautiful and most widely distributed of our marine Ostracoda. 

 It is mainly 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 



