THE MORPHOLOGY OF 'VHK CHEILOSTOMATA , 



265 



complete solution in the course of a few days, particularly if 

 the bottle be left on the top of a watei'-bath at about 60° C. 

 The cloudiness which appears on first mounting a preparation 

 soon disappears from a slide left on the water-bath. This 

 method cannot be too strongly recommended for certain 

 Polyzoa, particularly for the more delicate Ctenostome 

 genera, which are distorted almost beyond recognition by 

 the use of oil of cloves. 



In the case of some of the more densely calcified species I 

 have found great advantages in the use of the method 

 recommended in my paper on Stegauoporella (1900, 

 p. 240) of removing the basal wall, by means of a scalpel, 

 from stained colonies (not decalcified) embedded in paraffin. 

 I have also made use of thin slices, cut by hand, of uncal- 

 cified material embedded in paraffin. I am convinced of the 

 great importance of studying the Cheilostomatain nncalcified 

 Canada balsam preparations. Most of my slides have been 

 examined with a binocular microscope and a quarter-inch 

 objective. 



II. List op the Species specially studied. 



1. Eutliyris clat.hrata, n. sp. 



2. ,, obtecta, Hiiicks 



3. Euthyroides episcopalis, Bus 



(n- gen.) 



4. Flustra piscifonnis, l)U^k 



5. ,, papyiea, Pall. 



G. ,, cribiiformis, Bubk 



7. Farcimiiiaria hexagoiia, Busk 



8. Dimetopia spicata, Busk. 



9. Bicellaria grandis, Busk, var. pro 



ducta, MacGilliviay . 



10. Bugula neritina, L. 



11. Membraniporella nit ida, Jolinsf,. 



12. Cribrilina pliiloinela, Busk 



13. „ radiata, Moll . 



II. Unibouula verrucosa, Espcr . 

 15. ,, |)avoiiella, Alder 



10. Lejiralia pallasiana, Moll 



Port Jackson. 

 Torres Straits. 



Victoria. 



Bass's Strait (Challenger Coll.) . 



Naples. 



Singapore. 



.Amboiua (Challenger Coll.). 



Victoria. 



Victoria. 



Naples. 



S. Devon. 



Marion Is. (Challenger Coll.). 



Naples. 



S. Devon. 



North Sea. 



Naples. 



