THE 



VOYAGE OF H.M.S. CHALLENGED. 



ZOOLOGY. 



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

 PoLYZoA, procin-ed 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 Aspidophoea, G. J. AUmau. 



Genus Cephalodiscus, M'Intosh. 



CeioJialodiscus dodecaloj^hus, 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 group Mr. 

 John Murray forwarded the specimen to various authorities for examination, and sub- 

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

 be found to have affinities with the Annelida. An examination of this remarkaljle type 

 proved that amongst its other relations it was an ally of Rhabdoiileura, a new type of 

 the Polyzoa which had been ably described and figured by Professor AUman in 18G9' 



' Qimrt. Jovrn. Micr. Sci., vol. ix., N.S., 1869, pp. 57-63, pi. viii. 



(ZOOL. CHALL. EXP. — PART LXII.— 18S7.) Qqq 1 



