418 



CRISIID.^. 



Fig. 22. 



corneous joints (which are frequently jet-black) ^ and are 

 often of very considerable length. In the upper por- 

 tion of the shoots they are much more sparingly deve- 

 loped, and in this situation may perhaps act as tendrils. 



The ocecia, amongst the Crisice and the Cyclostomata 

 generally, differ widely from those of the 

 Cheilostomata. They seem in the present 

 case to be cells enlarged and modified for 

 the simple discharge of reproductive func- 

 tions, and may be regarded as homologous 

 with the ordinary zooecium of the Cheilo- 

 stomata in its reproductive phase, minus 

 the polypide. Smitt has studied their con- 

 tents *, and traced the ovum through some 

 of its changes into the larva. He has found 

 no sign of spermatozoa in the ovarian 

 chamber. 



The Crisice are widely distributed, occur- 

 ring in most parts of the world. 



structure of 

 ocecium. 



Genus CRISTA (part.), Lamouroux. 



Der. From Crista, a daugliter of Oceanus, according to Hesiod. 



Seiitulauia (part.), Linn. &c. 



Oelltlauia (part.), Pallas &c. 



Oellaria (part.), Ell. & Sol. : Lanik. : &c. 



Crisia, Lamx. (part.) : Flem. : Blainv. : M.-Edwards : Johnston : D'Or- 



bigny : Busk : Smitt : &c. 

 Falcaria (part.), Oken. 

 EucRATEA (part.), Fleming. 



Generic Character. — Zocecia in a single series, or in 

 two alternate series. 



* "Om Ilafsbryozoernas Utveckliag och Fettkroppar," (Efv. Kongl. 

 Vetensk.-Akad. Feirh. 18G5, no. 1, pi. iv. figs. 1-8. 



