50 REPORT ON FORAMINIFERA AND OSTRACODA 



Cythere parallelogramma, G. S. Brady 



(For references see previous Report) 



This species is here abundant, whilst in the raised beach deposit south-east of 

 Mount Larsen it was a rare form. 



Cythere normani, G. S. Brady (Plate VI, Fig. 2) 



Cythere normani, G. S. Brady, 1865, Trans. Zool. Soc. Lond., vol. v, p. 379, 

 PI. LXI, Figs. 5a-5d. Idem, 1880, Rep. Chall, Zool., vol. i, Pt. Ill, p. 101, PI. XVII, 

 Figs. Za-U, and (?) PL XXVI, Figs. 4«-46. 



Dr. Stewardson Brady found this species in the Challenger collection between 

 Kerguelen Island and Heard Island, Southern Ocean, at 150 fathoms ; and some 

 stouter examples, which he doubtfully referred to the same species, off the west coast 

 of South America, at 1825 fathoms. The latter examples have some light thrown 

 upon them through the present series. I am led to think that the South American 

 specimens belong to the same form; they are of heavier build, with a well-marked 

 subcentral knob on the surface of each valve. In the latter feature this species 

 approaches C. parallelogramma, from which it differs, however, in being stouter and 

 anteriorly broader. The species is a very variable one, judging by Brady's original 

 figures of the Abrohlos Bank specimens. 



The present examples are of finer texture, the reticulated surface being compara- 

 tively delicate, and the anterior and posterior spinulose border more densely armed 

 with fine prickles. The subcentral boss is present in all the specimens, and the sub- 

 marginal ridge of the ventral border is sharp and thin. 



Cythere polytrema, G. S. Brady (Plate VI, Fig. 3) 



Cythere polytrema, G. S. Brady, Trans. Zool. Soc. Lond., 1878, vol. x, p. 393, 

 PI. LXVI, Figs. la-Id. Idem, 1880, Rep. Chall. , Zool., vol. i, Pt. Ill, p. 87, PL XXI, 

 Figs. 5a-5h. 



This species is represented in the present series by a fair number of valves. They 

 are in a fine state of preservation, and the spines at either extremities are exceptionally 

 long and slender. It has been previously recorded as a fossil from the Antwerp Crag 

 (Lower Pliocene) of Belgium; and in recent soundings by the Challenger at 50-150 

 fathoms off Prince Edward Island, Southern Ocean. 



Genus — Loxoconcha, G. O. Sars, 1865 

 Loxoconcha mawsoni, sp. n. (Plate VI, Figs. 4a, 4b) 



Description. — Carapace oblong, tumid. Valve seen from the side, peach-stone 

 shaped, but unusually produced anteriorly. Dorsal margin roundly and evenly 

 curved ; ventral strongly convex in middle, sinuously excavated near the anterior, 

 and obliquely rounded at the posterior extremity, where it meets the blunt posterior 

 process. Edge view of carapace subovate, slightly compressed towards the extremities, 

 especially anteriorly ; greatest thickness just below the median line. Surface polished, 

 and relieved by a distant, vertical, linear series of elongate shallow pits. 



Measurements. — Length, -76 mm. ; width, - 45 mm. ; thickness of carapace, -34 mm. 



Affinities.- — The nearest related form to this distinct species is Loxoconcha honolu- 

 liensis, G. S. Brady,* a coral reef form from Honolulu. In shape the latter is broader 



* Rep. Chall., Zool., vol. i, Pt. Ill, 18S0, p. 117, PI. XXVIII, Figs. 6rt-6/. 



