156 



2o8. C. Stat. 282. Anchorage between Nusa Besi and the N. E. point of Timor, 27 — 54Metres; 



sand, coral and Lithothamnion. 1 colony. 

 202. B. Stat. 282. do, do; reef. 2 colonies. 



268.B. Stat. 303 and 60. Haingsisi, Samau Island, O — 36 Metres; Lithothamnion. 1 colony. 

 239. B. Stat. 310. 8° 30' S., II9°7'.5E., 73 Metres; sand with a few pieces of dead coral. 



1 very young colony, growing on a peristome of Entalophora proboscidea (on Entalophora- 



slide, 239. A. 1 ). 

 (?sp.) 251. M. Stat. 315. Anchorage E. of Sailus Besar, Paternoster Islands, o — 36 Metres; coral and 



Lithothamnion. 1 colony. 



Also (Mus. Zool., Cambridge) : — 



Torres Straits, 192, A. C. HADDON Coll., Reg. Feb. 24, 1898. 1 colony. 



Ceylon, determined by Miss Thornelv as L. novae-zelandiae, Miss L. R. Thornely, Reg. 



Apr. 25, 1906, 72. 1 colony. 

 Japan, Okinose, off Tokyo, 40 fathoms, A. OWSTON Coll., 5. AN., Reg. June 23, 1902. Many 



colonies. 

 Japan, Tosa, Shikoku Island, T. MlTZOBUCHl, Reg. Sept. 19, 1901. 4 colonies. 

 New Zealand, determined by Mr T. HlNCKS as L. novae-zealandiae ; HlNCKS Coll., Reg. 



May 13, 1899. Several colonies. 



Zoarium reaching a diameter of 8.5 mm. in large specimens, but usually smaller. Zooecia 

 in well marked radial rows, the more median zooecia commonly with much elongated peristomes. 

 The rays are usually composed of a single series of zooecia, but may be biserial at their 

 median ends or more rarely throughout their length. Ovicells with a cavity which is continuous 

 from the first ; sending prolongations into the intervals between the series of zooecia ; with a 

 porous roof, covered by large cancelli. üoeciostome a short simple tube, with a nearly circular 

 ooeciopore. Cancelli large, sometimes partially occluded by a cryptocyst-like lamina, and with 

 numerous pin-like spines radiating into their cavity. 



The zoarium varies in form, being sometimes plano-convex, with its marginal lamina 

 completely adherent to the substratum ; or saucer-shaped, with a free marginal lamina. lts 

 central region may be depressed (in colonies without ovicells), or this may be the thickest 

 part. In some cases the colony forms a short cylinder, the free end of which is occupied 

 mostly by a cancellated region, while the zooecial rays descend the sides of the cylinder. The 

 number of rays may be at least 40, but new rays are added between the older ones, from 

 time to time as the growth of the colony proceeds. 



The specimens referred to the present species vary greatly in their appearance; as for 

 instance in the prominence of the peristomes, in the form of the ovicells and in the size of 

 the openings of the cancelli. The particular form assumed appears to depend largely on the 

 age of the colony and on the presence or absence of ovicells. I have previously shown l ) 

 that in L, verrucaria the ovicell is usually developed at an extremely early stage in the growth 

 of the colony, and indeed in many cases from the oldest zooecium but one; that its further 

 growth is associated with the breaking down of the calcareous septa between the „alveoli" or 

 cancelli which occur at the bases of the peristomes; and (p. 132) that secondary ovicells may 

 develop in old colonies. In the species at present under consideration I have no evidence 



ij Harmer, S. I.. 1896, "üev. Lichenopora 1 ' ', Quart. J. Mier. Sci., XXXIX, pp. 98 et seq. 



156 



