. ON RECENT POLYZOA. 489 
can be obtained without we make a partial study as to how the cell is 
built up by the polypide. For the purpose of this study I know of no 
better training than the mastery of the details furnished by Barrois on 
Embryology, both of Cheilostomatous and Cyclostomatous Polyzoa, and 
after this the study of mounted or living specimens of Carbasea for the 
_ Cheilostomata, Zoobotryon pellucidus, Ehrenb., for the Ctenostomatous, and 
- Orisia or Hornera (Retihornera, Busk) foliacea, Macgil., for the Cyclostoma- 
tousgroups. In the first and second the endosarc and growth and develop- 
ment of the cells may be conveniently studied, and according to the character 
of the specimens, the growth and development of the polypide, and in the 
latter group the periodical growth of the cell and of the intercellular 
tubes, as noted by Busk (‘Crag Polyzoa’) and by Mr. Waters (‘Australian 
Bryozoa: Cyclostomata,’ Quart. Jour. Geo. Soc., vol. xl. p. 675 &c.) 
Classification of Marine Polyzoa. . Busk and H1ncxs (part). 
Sus-orpEr. CHEILOSTOMATA, Busk. 
Division I. STOLONATA, Carus. 
7% Family I. teide. 
Genus 1. Attea. 
Family II. Eucratiide. 
Genus 2. Encratea. Genus 4. Pasythea. 
», 3. Hippothoa. » 9. Brettia.! 
‘Family III. Chlidoniade. 
Genus 6. Chlidonia. 
Division II. RADICELLATA. 
Group A. CELLULARINA. 
Family IV. Catenariade. 
‘ Genus 7. Catenicella. Genus 8. Catenaria. 
: Family V. Cellulariide. 
Genus 9. Cellularia. Genus 13. Canda. 
‘ », 10. Menipea. » 14. Nellia. 
» il. Emma. » 15. Caberea. 
»,5 12. Serupocellaria. 
Family VI. Bicellariide. 
Genus 16. Bicellaria. Genus 19. Ichthyaria. 
» 17. Bugula. » 20. Beania. 
», 18. Kinetoskias. 
* See Busk, Challenger Report, p. xxii. See also genus 26, and p. 46, ibid. 
~ i >i ee-ce 
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