1897.] FBOM THE S.W. PACIFIC OCBATS^. 947 



down in the calice, by one of the directive septa. Corallum 

 usually heavy, the coeueiichyma between the cells and the stereo- 

 plasm' within being well developed and very dense in the older 

 parts of the colony. 



Funafuti ; 7 and 8 fathoms. 



The colour of the living colony is green. The corallum of the 

 lower stems of the colony is much stained with a dark red- brown 

 pigment on the exterior. The form described by Klunzinger as 

 P. favosa seems to me to belong to an entirely distinct species. 

 I have described the species from three large fragments, apparently 

 from the same colony, obtained from 7 fathoms. A clump 9 cms. 

 in diameter by 8 cms. in height was obtained from 8 fathoms ; 

 it differs in having the septa rather thinner, the secondary less 

 distinct. The base of the colony has round shallow cahces about 

 ■9 mm. in diameter. 



13. PociLLOPOEA ASPERA, Verrill. 



Pocillojpora asjpera, Verrill, Proc. Essex Inst. vol. vi. 1868, p. 93, 



Two small specimens correspond closely to Verrill's description 

 of this species. The largest is about 7 cms. long, and is part of 

 a considerable clump. The older branches are strongly compressed 

 and have the summits somewhat bare, while the younger branches 

 have their apices conspicuously verrucose. The verrucse vary from 

 2-5 mms. in length by 1-3 mms. in breadth at the base, and arise 

 obliquely, but are little appressed to the branches. The calices 

 of the verrucse are oval in shape, 1-1-3 mms. in long diameter; 

 their primaiy and secondary septa are distinct, the directive septa 

 more prominent and extending to a small, distinct, spinulous 

 columella. The calices of the ends of the branches are angular in 

 shape, about 1-1 mms. in diameter, with very thin walls, and are 

 very deep ; their septa and columella are not developed. In 

 places at the sides of the branches the calices are very small, not 

 more than -8 mm. in diameter, round in shape and shallow, with 

 distinct septa and columella ; the coenenchyma is well developed 

 between these, and covered with low granular spines. The 

 corallites of the base of the colony resemble the latter, but the 

 ccEuenchyma is better developed, and there are a few larger, round 

 calices 1-3 mms. in diameter. The corallum of the base of the 

 colony is stained a dark brown-red colour. The living colony is 

 dark green. 



Funafuti ; 5 and 30 fathoms. 



Var. i>hSM (Verrill). 



Pocillopora dance, Verrill, Bull. Mus. Comp. Zool. p. 59 (1864). 



Pocilhpora dance, Verrill, Proc. Essex Inst. vol. vi. 1868, p. 93. 



Two specimens correspond very closely to Verrill's description, 

 but there is a third, which seems absolutely intermediate between 

 this " species " and P. aspera, so that 1 have consiituted it a 

 variety. The septa and columella can be traced in many of the 



