512 MR. A. W. WATERS ON 



each of the new series commences with six. H. cmstraliensis has 

 19-21 tentacles. Unfortunately none of the specimens now 

 examined have ovicells. The Hasioellia group is well represented 

 in the North Italian Tertiaries, and although some appear to be 

 almost identical with living species, it seems better to keep them 

 distinct, as all the structures cannot be compared. 



There is over the surface an outer membrane, and then under 

 this there are membranes of the two walls of the shell showing 

 when decalcified the position of the pore-tubes. Some specimens 

 from Wasin have a pink colour. 



The operculum of the species and of the H. coronata H. or 

 H. gracilis, whichever we may have to call it, is identical, having 

 the opercular attachment very high up and elongate (see my 

 figure in Ann. Mag. Nat. Hist. ser. 5, vol. xx. pi. vi.). The 

 operculum of H. aicriculata B. has the muscular attachments much 

 lower down and not so near the edge ; further, the ovicell which is 

 but slightly raised, has a semicircular area, and the surface of 

 the zooecium has not pores all over. It seems exceedingly doubt- 

 ful whether R. auricidata should remain in Uasv)ellia, bat I have 

 never had sufficient material in my hands for a complete 

 examination. H. grandipora Waters is HasiveUia, and I now 

 think must stand as a species. 



Log. Holborn Island, Queensland (Ilastv.) ; near Torres Straits 

 (Chall.); Thursday Island, Torres Straits {Meissner) ; Formosa 

 Channel {Levinse7i). Wasin, Brit. East Africa, 10 fath. (500, 

 501, 507, 520), collected by Crossland. 



TUBUCELLARIA CERE0IDE3, Var. CHUAKENSIS Waters. 



Tubucellaria cereoides var. chuakensis Waters, ' Tubucellaria," 

 Journ. Linn. Soc, Zool. vol. xxx. p. 130, pi. xv. figs. 10-13, 18, 

 19, pi. xvi. figs. 20-25 (1907); Thornely, "Mar. Poly. Indian 

 Ocean," Trans. Linn. Soc, Zool. vol. xv. p. 146 (1910). 



Tubiocellaria fusiformis Busk {non d'Oi"b.), Zool, Chall. Exp. 

 vol. X. p. 100 (1884). 



Loc. Torres Straits (Busl'); Grahamstown, S. Africa; Provi- 

 dence, 50-78 faths. Chuaka, Zanzibar, 3 fath. (512, 524); 

 Wasin, Brit, E, Africa, 10 fath. (501); Chaki-Chaki, Pemba 

 Island (517), low water, collected by Ci'ossland, 



Tubucellaria fusiformis d'Orbigny. 

 Waters, loc. cit. p, 131, pi. xv. figs. 1, 2, 3, 14, 

 Loc. Malacca, Amirante Is., Chuaka, Zanzibar, 3 fath. (528) ; 

 Wasin, Brit. East Africa, 10 fath. (520), collected by Crossland. 



Tubucellaria zanzibaribnsis 'V^''aters. 



Waters, Zoc. cit. p. 131, pi. xv. figs. 4-7 ; Thornely, " Mar. Poly. 

 Indian Ocean," Trans. Linn. Soc, Zool. vol. xv. p. 146 (1912). 

 Loc. Saya de Malha, 145-150 faths.; Farquahar Reef; 



