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YOYAGE OF H.M.S. CHALLENGEE. 



ZOOLOGY. 



KEPORT on Cephalodiscus dodecalophus, M'Intosh, a new type of the 

 POLYZOA, procured on the Voyage of H.M.S. Challenger during the 

 Years 1873-76. By William C. M'Intosh, M.D., LL.D., F.R.S., 

 . &c., Professor of Natural History in the University of St. Andrews. 



Class POLYZOA, J. V. Thompson. 



Section Aspidophora, G. J. AUman. 



Genus Cephalodiscus, M'Intosh. 



Cephalodiscus dodecalophus, M'Intosh. 



Cephalodiscus dodecalophus, M'Intosh, Ann. and Mag. Nat. Hist., ser. 5, voL x., 1882, p. 337, 



et seq. 



Among the collections made by the Challenger Expedition in the Strait of Magellan, 

 there was a structure which, from its external appearance, was in the first instance placed 

 among the Compound Ascidians. When it was found not to belong to this grouji 

 Mr. John Murray forwarded the specimen to various authorities for examination, and 

 my attention was drawn to the anomalous organism in the hope that it might be found 

 to have afiinities with the Annelida. An examination of this remarkable type proved 

 that amongst its other affinities it was an ally of Rhahdopleura, a new type of the 

 Polyzoa which had been ably described and figured by Professor Allman in 1869' from 



' QuaH. Joum. Micr. Sci., vol. ix., N.S., 1869, pp. 57-63, pi. viiL 



(ZOOL. CHALL. EXP. — PAHT . — 18S7 ) 1 



