110 Transactions. 



this species from the •• Penguin " soundings round Funafuti 

 at 1,489. 1,995, and 2,715 fathoms. He also obtained this 

 species from soundings in the Arabian Sea. near the Laccadive 

 Islands (s.s. "Investigator"). 



Not uncommon, but rather small, in the dredging off 

 Great Barrier Island. 



Genus Xestoleberis, G. O. Sars. 



Xestoleberis margaritea, G. S. Brady sp. 

 Cytheridea margaritea. G. S. Brady, Trans. Zool. Soc, 1865, 



vol. v, p. 370, pi. lviii, figs. 6 a-d. 

 Xestoleberis margaritea, G. S. Brady, 1880, Rep. Chall., Zool., 



pt. iii, p. 127, pi. xxx, tigs. 2 a-g . Chapman, 1902, Journ. 



Linn. Soc. Lond. (Zool.), vol. xxviii, p. 429. Idem, 1902, 



Proc. Zool. Soc. Lond., p. 231. 



Dr. Brady found this species in the "Challenger" 

 dredgings at one locality only — namely, off Booby Island, 

 Torres Strait, 6-8 fathoms. The same author also records 

 it from the Mediterranean and the Mauritius. The writer 

 found it in the shallow-water sands of the outer beach and 

 lagoon of Funafuti, where it was fairly common, and in the 

 lagoon sands of Cocos Island. 



One perfect carapace found off Great Barrier Island. 



Xestoleberis africana, G. S. Brady. 



Xestoleberis africana, G. S. Brady. 1880, Rep. Chail., Zool., 

 pt. iii, p. 126, pi. xxx, figs. 4 a-c. 



This is a very rare and restricted form. It was originally 

 recorded from Simon's Bay, South Africa, 15 to 20 fathoms. 



One left valve found in our dredging from Great Barrier 

 Island. 



Genus Cytherideis, Jones. 



Cytherideis hedleyi, sp. nov. 



Plate III, figs. 8 a-c. 



Description. — Carapace elongated, compressed. Seen from 

 the side, arcuate and sdiquose ; depressed in front ; greatest 

 height about the middle ; posterior extremity slightly produced 

 at the ventral angle; back evenly arched, ventral edge sinuous. 

 fMue view elongate-ovate, rounded at the back, compressed in 

 front; greatest thickness about the middle of the lower third. 

 Surface of carapace ornamented with closely set polygonal 

 areolae or pittings, arranged in more or less regular concentric 

 lines. A linear series of muscle-spots situated in a lateral 

 depression of the carapace just below the median area. 

 Length, 06 mm.; height, 0-225 mm. ; greatest thickness of 

 carapace, about 0-66 mm. 



