174 Frederick- (Jhapman : 



yirmmuli/ia venom. F. and M. sp.. ("haprnan. 1895. Pioc. 

 Zool. Soc. Lond., p. 47. 



OhHcr vat ions. — This interesting species occurs twice in these 

 hores. It was accepted as a nummulite by Dr. H. B. Brady in 

 his work on the "Challenger" foraminifera (loc. supra cit.), but 

 he did not seem quite convinced that it belonged to that genus, for 

 he says,i " On the whole I am inclined to agree in this latter 

 ■determination " [as a nummulite by Carpenter] " notwithstanding 

 the fact that in any large collection of specimens there ai-e invari- 

 ably a certain number in which the segments of the final convolu- 

 tion spread out radially, so as to impart an Operculi7ia-\\ke aspect 

 to the shell." 



In my own cabinet there is a series of tests of this form from the 

 East Indian Archipelago, which shows extreme modification, ending 

 with the typical Operculina . 



Operculina venosa is found on parts of the Australian coast at 

 the present day, in the neighbourhood of the Great Barrier Reef. 



Distribution.— Bore 1, 215-244 feet. Bore 11, 566-568 feet. 



SPONGIAE. 

 CALCISPONCxIAE. 



SprcuLES, indet. 

 The spicules of calcareous sponges enumerated in the lists of 

 fossils from the borings are all of the tri-radiate type, and confoi-m 

 to figures 4, 5 and 6 of plate iii. in Dr. Hinde's description of 

 Plectroninia halli in their outline, but are more than twice the 

 size. 2 No precise identification is, liowever, attempted here. 



ANTHOZOA. 

 HEXACORALLA. 

 Fam. TUHBINOLIIDAE. 

 HoLCOTROCHUS CRENULATUS, Dennaut. (Plate XVTI., Fig. 10.) 

 JIolcotrocliHS cretiidatiis, Dennant, 1904, Trans. R. Soc. 

 S. Austr., vol. xxviii., p. 'i, pi. ii., figs. ia-c. 

 Observations. — This neat little coral is not easily confused witli 

 the only other known form of the genus, //. scriptus, for the latter 

 <liffers in its more broadly-ovate transverse section, and in the 

 horozontal scribing of the costae; whilst the surface of the thecal 

 wall in //. crenulatus is granulate. 



1. Loc. supra cit., p. 742. 



2. Quart. Jouni. Geol. Soc. vol. hi. 1!) in, pp. .50-69, pita, iii.-v. 



