448 REPORT ON THE POLYZOA COLLECTED BY DR WILLEY 



38. Rhynchozoon bispinosum, Johnston. Hincks, Brit. Mar. Pol. p. 38.5. 

 The mucro is small and no spines are visible even on the marginal cells. 



39. Rhynchozoon crenulatum, Waters. Rhynchopora crenulata, Waters, Ann. Mag. 

 Nat. Hist., 5, xx. 1887, 195. 



There is only one colony of this species. 



40. Escharoides spinigera, n. sp. PI. XLIIL, fig. 12. 



One small encrusting colony. 



Zooecia ovate, surface smooth and polished. Primary orifice sub-orbicular with 

 an entire margin ; above the orifice eight spines ; the secondary orifice with a sinus 

 on one side of the lower margin ; on the inner side of the peristome directed 

 towards the sinus a minute avicularium with a bluntly pointed mandible ; on some 

 zooecia, placed by the side of the orifice, an avicularium with a spatulate mandible 

 directed upwards. 



Ooecia ? 



Measurements : zooecium from "29 to '37 mm. in width x '30 to '43 mm. in length, 

 operculum "06 mm. x "08 mm. 



The avicularium on the inner side of the peristome is visible in only a few cells. 



41. Gellepora simplex, MacGilli\Tay. McCoy. Prodr. Zool. Vict. p. 241, pi. 165. 

 A common species in Lifu. 



44. Cellepora longirostris, MacGillivray. Pi. XLIII., figs. 15, 15 a. MacGilL, Trans. 

 Roy. Soc. Vict. 1884, p. 113. 



The collection contains two fragments which appear to belong to this species. 

 Both are encrusting, but from the centre of one there projects a short process which 

 suggests that the specimen may be simply the encrusting base of an erect colony — 

 the erect habit being characteristic of Cellepora longirostris. The young zooecial 

 stages described by MacGillivray are clearly seen on the margin of the specimens. 

 The orifice has a rounded sinus, and on one side is the small avicularium which is 

 later concealed by the growth of the peristome. The opposite edges of the latter 

 arch over the sinus and form a rounded opening which is subsequently filled in. 

 Finally there grows up from the sub-oral part of the peristome an enormously developed 

 rostrum, the free apical part of which is, as a rule, coarsely serrated. The rostrum 

 has a thick base, and generally bears on its outer face an elongated avicularium 

 directed downwards. The unusual size of the rostrum is a striking characteristic of 

 the Lifu specimens. The ovicell is globular, and is almost concealed by the peristome. 

 The front is sculptured in a radiate manner. 



45. Retepora phoenicea, Busk. Busk, Brit. Mus. Cat. ii. 94. Busk, Challenger 

 Report, XXX. 124. 



This species is plentiful in. Lifu. 



