168 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
CHAPERIA TROPICA, sp. nov. (Plate 17. fig. 1.) 
The area occupies about half the front of the zocecium and the opesial 
aperture is straight below. At the proximal end of the zocecium there is a 
large raised process, dividing at the end laterally in a cervicorn manner, 
and on the front of this process there is a triangular ayicularium. The 
ovicell is broad, subimmersed. 
This seems to belong to the C. minax group, and has some relationship 
with C. umbonata, but differs in having the aviculariam on the front. It 
seems nearest allied to C. cylindracea, var. protecta*, Waters, from the 
Antarctic, but in that case the process has lateral branches. 
Loc. Gimsah Bay, Red Sea, collected by Hartmeyer. Growing on stone. 
MicroporELtia Maxusit (Audowin). 
See Miss Jelly’s Catalogue and add :— 
Reploporina hexagona, dOrb. Pal. Franc. vol. v. p. 444. See Waters, Ann. Mag. Nat. 
Hist. ser. 7, vol. xv. (1905) p. 8. 
Although M/. Malus, Aud., is so widely distributed I have only come upon 
one piece in these collections. 
Loe. Cosmopolitan. Um el Jerman, Gulf of Suez, on Retepora jermanensis 
nov. 
Fossil. In the Tertiaries of Europe, Australia, and Patagonia. 
SCHIZOPORELLA NIVEA, Busk. (Plate 17. figs. 2-4.) 
Schizoporella nivea, Busk, Zool. Chall, Exp. vol. x. pt. xxx. p. 163, pl. 17. fig. 1 (1884) ; 
Philipps, “ Report on the Polyzoa from the Loyalty Islands, &c.,” Willey’s Zool. Results, 
pt. iv. p. 440 (1899) ; Thornely, ‘‘ Manaar,” p. 114 (1905); Rec. Indian Mus. vol. i. pt. 3, 
no. 13, p. 189 (1907). 
The Red Sea specimens have two very small circular avicularia at the 
distal corners, and at one of the proximal corners a broad spathulate 
avicularium. It has not been thought that the presence of this spathulate 
avicularium necessitates making a new variety, though at one time it was 
decided to call it var. millanensis. 
The operculum has the muscular attachments close to the border, and there 
are faint lines across it. The Red Sea and Manaar specimens have the 
opercula about one-third smaller than those collected by the ‘ Challenger.’ 
There is a specimen from Zanzibar, in many respects like the present, 
though there is a rostrum below the aperture, and the operculum is longer 
with a narrow poster. SS. nivea in many respects is like S. linearis, var. 
quincuncialis, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. vii. p. 158, pl. ix. 
fig. 3. 
* Résultats du Voy. du 8.Y. ‘Belgica,’ Bryozoa, p. 34, pl. 2. fig. 3. 
