REPORT ON FORAMIXIFERA AND OSTRACODA 39 



Measurements. — Length, "67 mm. ; height, "41 mm. ; thickness of carapace, 

 •52 mm. 



Observations. — The general outline of this species is suggestive of C. abyssorum, 

 G. S. Brady.* There are, however, marked specific differences in the present form 

 which prevent any reference to that species. The greater relative length ; the evenly 

 sloping surface of the alar prolongation ; the relatively longer posterior extremity ; 

 and the absence of any superficial foveolation, all combine to render it distinct. 



Type specimen, a right valve. 



Genus — Cytherideis, Rupert Jones, 1856 

 Cytherideis Icevata, G. S. Brady (Plate IV, Fig. 5) 



Cytherideis Icevata, G. S. Brady, 1880, Rep. Cliall., Zool., vol. i, Pt. II, p. 146, 

 PI. V, Figs. 5a-U; PI. XXXV, Figs. Qa-6d. 



We have in the present series two typical valves of this delicate-shelled species. 

 On both examples there are peculiar elongate and contorted markings, seen through 

 the translucent shell, and probably due to remains of visceral attachments within 

 the valves. 



This species was dredged by the Challenger off Heard Island, Southern Ocean, 

 from mud, at 75 fathoms. Dr. Brady remarks that the specimens were " very few " 

 and seem to be all empty shells." 



* Rep. Chall., Zool., vol. i, Pt. Ill, 1880, p. 138, PL XXXIV, Figs. 3a-d. 



