280 J. F Whiteaves—Heteroporafrom Juan de Fuca. 



perforated by numerous openings. These structures have been 

 held to be the homologues of the tabulae and septa of the tabu- 

 late corals, and of the mural pores of the Favositidse. Lindstrom, 

 in 1876, maintained that the Paleozoic fossils known to geolo- 

 gists as Ghcetetes, Stenopora and Monticulipora have almost 

 exactly the same kind of internal structure as Ileteropora, and 

 consequently that the former genera should be removed from 

 the class Anthozoa, to which the true corals are supposed to 

 belong, and placed with the Polyzoa,— a conclusion which had 

 been arrived at ten years before by Dr. Rominger. 



Many species of Heteropora have been described from the 

 Mesozoic and Tertiary rocks of Europe and the United State-, 

 but no living representative of the genus had been discovered 

 until 1879. " In that year Mr. Waters described and figured a 

 recent species from Japan under the name H. pellicula La, in the 

 Journal of the Royal Microscopical Society; and a little later 

 in the same year, in the Journal of the Linnssan Society, Mr. 



■':,- 



" oon from New Zealand, which he called H. Neoze- 

 Waters and Dr. H. A. Nicholson, however, have 

 both expressed the opinion that the II. Neozelanica of Busk is 

 identical with the previously described //. pelliculata. 



On the coast west of Sooke, Vancouver Island, in the Strait 

 of Juan de Fuca, Mr. James Richardson, late of the Geological 

 Survey of Canada, found a single specimen of a recent 

 polyzoon, in 1874, which, in the writer's judgment, cannot 

 lished by any tangible diameter t'rom the Japanese 

 and New Zealand species of Helen, r <n- n described by Messrs. 

 Waters and Busk. No thin sections of this specimen have 

 been made to show the minute structures of the interior, 

 but the whole of the outer surface has been carefully 

 examined under the microscope, and camera drawings of 

 some of the most striking appearances thus presented have 

 been made. The punctured, calcareous pellicle which Mr. 

 Waters represents as closing the mouths of the interstitial 

 Tr pelliculata, the character which suggested that 



t;: 



seen in pari 



The general shape of the polyzoary of the latter £ 

 ' 2al cl 



specific name, can be well 

 ;eneral shape 

 nicroseopical characters of other portions of the surtace agree 

 perfectly with Busk's figures of the corresponding parts of //. 

 Neozelanica. In one portion of the surface of the Fuca poly- 

 zoon it was noticed that the apertures of some of the larger 

 tubes project distinctly beyond the general level, a feature not 

 specially indicated in any of Messrs. Waters' or Busk's illus- 

 ti it hi- 1 it this -light vari tion from their types can scarcely 

 be held as indicative of a specific difference from them. 



