526 MR. A. W. WATERS ON 



Loc. Tongatabu (Polynesia), 18 fath, {Chall.)\ Samboangan, 

 10 fath. (Chall.); Port Phillip Heads, Victoria (MacG.); San Pedro 

 Shoal, 25 fath.; Daros Island, Amirante Group (in my collection, 

 sent to me under another name). Wasin, Brit. East Africa, 10 

 fath. (507), 20 fath. (520), collected by Crossland. 



Fossil. Victoria, Tertiaries (MacG.). 



Eetepora denticulata Busk. (PI. LXXII. fig. 8.) 



Retepora denticidata Busk, Zool. Chall. Exp. vol. x. p. 109, 

 pl. xxvi. fig. 1 (1884); Philipps, "Rep. on Polyzoa," Willey's 

 Zool. Results, p. iv. p. 449, pl. xliii. fig. 13 (1899); Calvet, " Bry. 

 d'Amboine,'-" Rev. Suisse de Zool. vol. xiv. p. 620, pl. xxi. 

 figs. 2-9 (1906); Thornely, "Mar. Poly, of the Indian Ocean," 

 Trans. Linn. Soc, Zool. vol. xv. p. 147 (1912). 



The lamina of the ovicell is not quite so long as that figured 

 by Oalvet, nor has it the orifice mentioned by him. Only a 

 few ovicells have been found. The trabeculse are not barren. 

 There are large bifid avicularia on many of the zooecia near to 

 the distal end, which are probably only the small labial avicularia 

 modified ; also there are small semicircular or oval avicularia in 

 the older zocecia, near the middle of the front surface, but in the 

 younger zooecia they are wanting. Similar avicularia also occur 

 in the ' Challenger ' specimens. 



There are about 11 tentacles. 



Internally, at the proximal end on each side of the zocecium, 

 there is a chitinous thickening (fig. 8) for the attachment of the 

 muscles which withdraw the polypide, and between these two 

 sets of retractors there is a thick funicular bundle passing to 

 the next older zooecium. The interior wall of the zooecium is 

 lined with very large square cells, and very similar cells line the 

 zooecial and vibracular chambers and the tube-pores of some 

 Cupuhtrice, recent and fossil. 



Reteporella dendroides Ortmann is similar in many respects. 



Loc. Sandwich Is., 20-40 fath. (Calvet); Lifu, Loyalty Is. 

 (P/i.); Amboina (Calvet); Amirante, 15-35 faths., Seychelles, 34 

 fath. (Th.). Wasin, Brit. East Africa, 10 fath. (501), collected by 

 Crossland. 



Retepora jerjianensis Waters. 



Waters, " Mar. Biol, of the Sudanese Red Sea," Journ. Linn. 

 Soc, Zool, vol. xxxi. p. 176, pl. xviii. figs. 11-16. 



Loc. Red Sea (Waters). Prison Island, Zanzibar Channel (513), 

 the shore, collected by Crossland. 



Retepora tubulata Busk, var. 



Retejwra tubidata, type. Busk, Zool. Chall. Rep. vol. x. pt. xxx. 

 p. 121, pl. xxviii. fig. 2 (i884) ; Thornely, " Ceylon Pearl-Oyster 

 Fisheries," vol. iv. p. 125 (1905); Records of Indian Museum, 

 vol. i. p. 193 (1907). 



