TRANSACTIONS OF SECTION D. 497 
Ctenophores. Consequently the Ctenophores should be classified with the 
Plathelminths, not with the Coelenterates. 
For the question about the origin of the bilateral from the radiate type 
T'jalfiella is likewise of considerable value. ‘The first step in this transformation 
is the splitting up, along the transverse axis, of the oral side of the body, as 
seen in the embryo of 7'jalfiella, and also in Ctenoplana. The next step is the 
wandering of the apical organ towards the anterior end, and the bending of 
the main axis, as shown by Lang. Only the inside of the oral lobes is ciliated ; 
seeing now that in Caloplana only the underside of the body is ciliated, it 
appears that the whole underside of Celoplana corresponds to the inside of a 
pair of oral lobes. Also in the pelagic larve of Polyclads the same splitting up 
of the oral side, along the transverse axis, appears to take place, the larval 
processes being the homologues of the oral lobes of the young 7'jalfiella and of 
Ctenoplana. ‘Lhe ciliated bands are a specialisation of the general ciliation, 
which here likewise occurs at first only on the inside of the lobes; these bands 
accordingly represent a pre-oral and a post-oral band, not a pre-oral band alone. 
Herewith further, the origin of the two ciliated bands, as also of the ciliated 
part between the two bands, in the /'rochopiora appears to be naturally 
explained. 
7. On some New Alcyonarians. 
By Professor J. Anruur Tromson, F.R.S.E, 
8. Report on the Occupation of a Table at the Zoological Station at 
Naples.—See Reports, p. 186. : 
9. Final Report on the Index Animalium.—See Reports, p. 143. 
10. Report on the Biological Problems incidental to the Belmullet 
Whaling Station.—See Reports, p. 145. 
11. Final Report on the Inheritance and Development of Secondary 
Sexual Characters in Birds.—See Reports, p. 187. 
12. Fourth Report on the Feeding Habils of British Birds. 
See Reports, p. 189. 
13. Twenty-second Report on the Zoology of the Sandwich Islands. 
See Reports, p. 189. 
14. Report on Zoology Organization.—See Reports, p, 190. 
15. Report on the Occupation of a Table at the Marine Laboratory, 
Plymouth.—See Reports, p. 190. 
16. Fifth Report on Experiments in Inheritance. 
17. Report on the Formulation of a Definite System on which Collectors 
should recora their Captures. 
J912. K K 
