92 VERRILL, SYNOPSIS OF 



son,* which renders it probable that this specimen was 

 from that locality. I am not aware that P. hrevicornis has 

 been attributed to those Islands by any other author, and 

 hence infer that the species does not really occur there, 

 since it was not in the extensive series of Pocilliporae col- 

 lected by Messrs. H. Mann and W. T. Brigham, nor the 

 large collection made by Mr. A. Garret at the same place 

 for the Museum of Comparative Zoology. 



PociLLiPOEA BREVicoRNis Lamarck. 



Pocillopora hrevicornis {pars) Dana, Zooph., p. 526, PL 49, fig. 8 ; 

 Edw. and Haime, Vol. 3, p. 304. 



Two specimens from Ceylon, collected by Rev. G. A. 

 Ap thorp, are in the Museum of Yale College. These are 

 the original Ceylon specimens described by Dana. They 

 agree well with the later description by Edwards and 

 Haime, and appear, therefore, to represent the typical 

 form of this species. They are also quite distinct from 

 the specimen referred to the last species, with which they 

 were probably not directly compared by Prof. Dana, 

 since that specimen was not sent here until long after his 

 work was published. 



This species differs from P. ccespitosa in its branches, 

 which are much more equal and regular in length and 

 size, and rise more nearly parallel, leaving more uniform 

 spaces between, and are also longer and less subdivided, 

 the branchlets taking the form of ascending, elongated, 

 sometimes proliferous verrucse, which are often oppressed 

 on the sides, but are shorter and crowded on the summits 

 of the branches. The cells are larger and much more 

 crowded on the sides of the branches, seldom becoming 

 circular. The septa are rudimentary, and the columella 

 usually wanting, the cells on the sides of the branches 

 being usually shallow, with a nearly flat bottom. 



*For an account of this singular parasite, see the American Jour- 

 nal of Science, Vol. 44, p. 126, 1867. I have noticed a similar parasite 

 on P. elongata Dana, from Ceylon, near the top of one of its very 

 thick branches, but never among the thick-branched Pocillipores of 

 the Hawaiian Islands. 



