BRYOZOA FROM ZANZIBAR. 507 



Nat. Hist. ser. 6, vol. v. p. 17 (1890) ; Proc. Roy. Dublin Soc. n. s. 

 vol. vi. p. 612 (1890) : Calvet, Exped. Scient. du Travailleur et du 

 Talisman, vol. viii. p. 416 (1907). 



Trypostega venvsta Levinsen, "Studies on Bryozoa," Vid. Medd. 

 f. d. Naturh. Foren. i Kj<^benhavn, p. 23 (1902) ; Morph. & Syst. 

 Studies ou Chil. Bry. p. 281, pi. xix. figs. 1 a~\d, pi. xxii. 

 figs. 13 a-\'6d (1909) ; Norman, " Polyzoa from Madeira," Journ. 

 Linn. Soc, Zool. vol. xxx. p. 299 (L909). 



Gemellipora glabi^a, form striaivla Smitt, ' Floridan Bryozoa,' 

 pt. ii. p. 37, pi. xi. p. 207 (1873) ; Thornely, " Mar. Poly. Indian 

 Ocean," Trans. Linn. Soc, Zool. vol. xv. p. 149 (1912). 



Gemellipora striatula MacG. Prod, Zool. Yict. dec. xiv. p. 150, 

 pi. 138. fig. 10 (1887). 



Lepralia striatula MacG. Tr. Roy. Soc Yict. p. 134, pi. iii. fig. 17 

 (1882). 



Schizoporella striatida Waters, Q. Journ. Geol. Soc. vol. xli. 

 p. 301 (1885) ; Philipps, " Poly. Loyalty Isles, &c.," Willey's Zool. 

 Results, pt. iv. p. 440 (1899). 



Mollia t'uhercidata d'Orb. Paleont. Franc, p. 388 ; see Waters, 

 Ann. Mag. Nat. Hist. ser. 7, vol. xv. p. 6. 



Lepralia inornata Gabb & Horn belongs to this group. 

 . I should have hesitated, at present, to put this in a new genus 

 merely on account of the small chamber above the zocecium, 

 which no doubt must be considered as a vestigial avicularium, 

 but as a genus may be required it will now cause less confusion 

 to use Levinsen's name. Lepralia tu7-gescens Reuss, " Foss. Bry. 

 Oest.-Ung. Miocans," Denlc. K. Akad. der Wissensch. Wien, 

 math.-naturwiss. Class., vol. xxxiii. p. 36, pi. viii. fig. 7, has an 

 avicularium, whicli, judging from the figure, corresponds to 

 the small chamber above the zooecium in T. venusta, and also 

 the avicularium of Chorizopora hrongnia^'ti Aud. is often 

 similarly situated. 



Sections of the specimen from Wasin show that there are no 

 bands of muscles in the chamber above the zooecium, but there 

 are protoplasmic bands to the frontal disk, starting from two 

 rosette-plates at the proximal end of the small chamber, and 

 near the distal end there is a small group of cells at each side, 

 which must probably be considered as glands. There are a few 

 irregular large chambers almost as large as the ordinary zocecia 

 closed in the same way as these small supra-zooecial chambers. 



There are but few ovarian cells in the ovarium, usually two, 

 sometimes three or four, and one may be seen developed to a 

 considerable size. The embryos develop fully in the ovicell. 

 No suboral glands have been found. 



Log. British ; Guernsey ; Calvados ; Florida ; Madeira [Nor- 

 man); Azores; Cape Verde Islands (C); Lifu, Loyalty Isl. (PA.); 

 China Seas (Tizard Bank), 27 fath.; Torres Straits (^'.); Amirante, 

 22-85 fath., Saya de Malha, 29-125 fath. {Thornehj); Mauritius. 

 Wasin, Brit. East Africa, 10 fath. (500), collected by Crossland. 



Fossil. River Murray Cliffi^, South Australia. 



