On the Morphology o/Antedon rosacea. 19 



The peristomes of the cells are also perforated, but the 

 *' tubules " in these are more elongate than those of the area. 



In one of my specimens the whole length of the cell is 

 exposed on the inner side, and the ends of the " tubules " or 

 porous openings are also exposed on the inner walls, for these 

 seem to have served some special purpose in the economy of 

 the growing cell *. 



Although rather familiar with the closures of Palaeozoic, 

 Jurassic, and recent Cyclostomata, I have never noticed similar 

 features to those described above. As we are as yet only in the 

 infancy of our knowledge respecting the developmental features 

 of Cyclostomatous Polyzoa of past ages, all careful observations 

 bearing on this point are valuable, especially because, as Mr. 

 Waters says, " further examination [of species] enables me 

 to state that the position and the character of this diaphragm 

 may be employed as a useful specific character " f. 



III. — J%e ilforpAo^o^'?/ o/" Antedon rosacea. By P. Herbert 

 Carpenter, D.Sc, F.K.S., F.L.S., Assistant Master at 

 Eton College. 



The ' Traite d' Anatomic Comparee Pratique ' by Messrs. 

 Vogt and Yung, which is now in course of publication both 

 in French and in German, is described in the authors' pro- 

 spectus as designed to aid the student in making an " etude 

 appro fondie " of certain selected zoological types, their struc- 

 ture being investigated " couche par couchcj organe par organe." 

 The ' Traitd ' " sera compose d'un serie de monographies 

 anatomiques des types, r^sumant I'organisation animale 

 toute entifere." This is clearly a very high standard ; for in 

 the present state of zoological science a monographic descrip- 

 tion of any known type can only be properly worked out by 

 a very detailed process of investigation, requiring the com- 

 bination of various methods of research and an intimate 

 acquaintance with the literature of the subject. In the case 

 of those animals which possess a hard skeleton its relation to 

 the soft parts must be made the subject of very careful inves- 

 tigation. The mere cutting of thin sections for histological 

 examination is not a sufficient means of research ; but the 

 comparative osteology and the macroscopic characters of the 



* See Busk, Crag Polyzoa, p. 122, and A. W. Waters, "On the Oc- 

 currence of Recent Ileteropora," Journ, Roy. Micr. Soc. vol. ii. p. 390 

 (1879). 



t Journ. Linn. Soc, Zool. vol. xvii. p. 401. 



2* 



