34 Frederick Chapman : 



CYTHiiHK DASYDEHMA, G. S. Brady. (Plate VI., Fig. 10). 



Ci/t/iere dasyderma, G. S. Brady. 1880, Rep. Chall. Zuol., 



vol. i., \>t. iii., p. 105, pi. xvii., figs, io-f ; pi. xviii.. 



figs. ia-f. 



Ohservations. — The living species diffei-s from our fossil examples 



in having the intersections of the angular excavations beset with 



short, blunt spines. In the fossils the angular pittings are strongly 



developed, and it may be surmised that the spines, if any existed, 



were fine and have been abraded. 



C. dasyderina has been recorded by its first describer from 20 

 widely separated localities, all of which sh(jw deposits of a more 

 or less deep sea nature. 



Occurrence. — Bore 11. 552-554 feet; 554-556 feet (Janjukian). 



Cythere dkmissa, G. S. Brady. (Plate VI., Fig. 11). 



Cythere deniissa, G. S. Brady, 1868, Ann. Mag. Nat. Hist., 



ser. 4, vol. ii.. p. 180, pi. xii.. figs. 1, 2. Idem. 1880, 



Rep. Chall. Zool., vol. i.. pt. iii., p. 66, pi. xii., figs. 



, \a-j. Id., 1890, Trans. Roy. Soc, Edin., vol. ixxv., 



pt. ii., No. 14, p. 497. 



Ohservations. — ^The fossil specimens exhibit the merest trace of 



the posterior spines of the border sometimes seen in the living 



examples. Recent specimens were dredgd from Port Jackson at 2 



to 10 fathoms; and from Noumea, New Caledonia, 2 to 6 fathoms. 



In the South Sea Islands it occurred between tide-marks. 



Occurrence.— Bove 10, 160-186 feet; 225-230 feet (Kalimuan). 



Cythere bictyon, G. S. Brady. (Plate VII., Figs. 12, 13). 



Cythere diet yon. G. 8. Brady, 1880, Rep. Chall. Zool., vol. 



i., pt. iii., p. 99, pi. xxiv., figs. la-y. Egger, 1901, 



Abhandl. d. k. bayer. Ak. Wiss.. vol. xxi., abth. ii., 



p. 442, pi. vi., figs. 41-43. 



Ohservations. — -It will be seen on reference to the splendid series 



of figures given by Dr. Brady that this species is very variable, 



owing to the passage of the aculeated surface in the younger stages 



into the strongly ribbed and excavated ornament of the older 



stages. In the senile condition it somewhat resembles C . normani, 



but the latter has a more olilifiuely truncated antero-dorsal angle. 



