142 PERCY SLADEN TRUST EXPEDITION 



front wall of the zooecium is occupied by the aperture, which is wide and open. Avicularia 

 are situated a little way up the margin of the aperture on long, stout peduncles, they have 

 a powerful long, curved beak with a sharp tooth midway on the lower edge. This and 

 the position of the ocecium make a marked difference in this species from B. rohusta, 

 MacGillivray*, which it somewhat resembles. 

 Amirante, 34 fath. ; Providence, 50 fath. 



20. Bugula neritina, var. tenuata, nov. (Plate 8, fig. 2). 



This variety has the same shape of zooecium as the last, with pointed outer angle, no 

 spines, and has the ooecium turned sideways. The colonies are about 2 inches in height 

 where they are broken off, they are thin and straggling, of a yellowish grey colour. Zooecia 

 are almost uniserial in their arrangement, the aperture occupies about f of the front 

 wall, the sides of the zooecium are curved inwards, narrowing the aperture. Avicularia 

 are borne on long, slender peduncles and are situated below the aperture ; they are 

 globular with short parrot-like beaks. 



Cargados, 28 fath. 



21. Bugxda neritina, var. ramosa, nov. (PL 8, fig. 3). 



This variety is of a red colour. Branches are given off at right angles from the sides 

 of zooecia, rounded and narrowed towards their bases and with a joint near there. Zooecia 

 are uniserial on the upper portion of the colony, turning alternately to either side, the 

 lower portion attached and lying against the back of the zooecium below, the upper portion 

 free, its front wall entirely occupied by the aperture, which is covered by a reddish 

 membrane. The sides of the zooecium curve inwards considerably, and a few perforations 

 are to be seen along their margins. Avicularia are rarely to be seen, they are small, on 

 fairly long peduncles, and situated below the aperture as in the last species. The ooecium 

 has a pitted surface. 



There are merely fragments of this species growing among Canda retiformis. It 

 resembles B. uniserialis, Hinckst, but is much larger, red, and branches differently. 



Amirante, 23 fath. 



22. Bcania intermedia (Hincks). 



Diachoris intermedia, Busk, Ann. Mag. Nat. Hist., ser. 5, viii, 1881, p. 133. 

 Indian Ocean. 



23. Membranipora norm,aniana (d'Orb.). Waters, Journ. Linn. Soc. London, ZooL, 

 xxvi, p. 670. 



There are numerous representatives of this species encasing stems of Hydroids and 

 other objects. 



Providence, 50 — 78 fath. ; Amirante, 32 fath. 



24. Memhranipora radicifera, Hincks, var. intermedia, Kirkpatrick, Proc. Roy. 

 Dub. Soc, vi, p. 615. 



Salomon, 75 fath. 

 * MacG., Prod. Zool. Vict. Dec. viii, p. 29. t Ann. Mag. Nat. Hist., ser. 5, xiii, 1884, p. 367. 



