FROM THE LOYALTY ISLES, NEW GTJINEA AND NEW BRITAIN. 449 



46. Retepora denticulata, Busk. PI. XLIIL, fig. 13. Busk, Challenger RejDort, 

 XXX. 109. 



The dorsal avicularia seem to be more numerous than on the Challenger specimens. 

 They occur laterally on the dorsal surface and on the trabeculae connecting the branches. 

 The beak is bluntly j^ointed and is bent up at the end ; the mandible is triangular 

 with a broad base ; the pointed apex is bent down. The ooecia in many respects 

 resemble those of Retepora apicidata (Busk, Challenger Report, XXX. 108). They are 

 globular, smooth and sub-cucullate. There is a median grooved keel on each side of 

 which there is a slight longitudinal depression. The upper lip of the opening is trifid. 



47. Crisia acideata, Hassall. Hincks, Brit. Mar. Pol. p. 421. Hassall, Ann. 

 Mag. Nat. Hist. (.5) vii. 368. Harmer, Q.J. M.S. 18.91, p. 132. 



There is one small colony growing on a sea-weed. In the absence of an ovicell, 

 it may provisionally be referred to this species. 



48. Crisia denticulata, Lamk. Hincks, Brit. Mar. Pol., p. 422. 



There are several colonies growing on a large crab. No ovicells are present on 

 the specimens. 



•50. Idmonea interjuncta, MacGillivray. MacGill. Trans. Roy. Soc. Vict. 1885, p. 137. 

 Common. 



.51. Idmonea radians, Lamarck. Busk, Brit. Mus. Cat. iii. 11. 

 Very common. 



.52. Idmonea australis, MacGillivray. McCoy, Prodr. Zool. Vict. T. PI. 68, p. 30. 

 Several rather young colonies. 



53. Entalophora delicatida, Busk. 



Pustulopora delicatula. Busk, Brit. Mus. Cat. iii. 20. 

 Several small colonies. 



54. Hornera spinigera, Kirkpatrick. Kirkpatr., Ann. Mag. Nat. Hist. 6, i. 1888, 83. 

 One large fine colony. 



59. Lichenopora californica, D'Orb. 



Discoporella californica. Busk. Brit. Mus. Cat. ill. p. 32. 

 One small colony growing on a Nautilus shell. 



60. Lichenopora truncata, n. sp. PI. XLIII., figs. 14 and 14 a. 



Zoarium convex, flattened on the top ; shaped like a truncated cone, bordered by 

 a thin lamina ; central flattened area occupied by cancelli. Zooecia ai-ranged in long 

 uniserial rows of almost equal length, there being about fifteen zooecia in a mw in 

 the type specimen. Zooecia not raised above the surface. Orifice circular, the peri- 

 stome being produced on the upper side; margin of the peristome entire or slightly 



