NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



703 



Family CRISIIDAE Johnston, 1847. 



Anatomical biblingraiiliu. 1877. BARROIS, Recherches sur 1'embryologie des Bryozoaires, Travaux 

 de 1'Institut de Zoologie, Lille, fasc. 1, pi. 3, figs. 22, 23, 24. 1838. MILNE-EDWARDS, 

 Memoire sur les Crisies, les HiJrneres et plusieurs autres Polypes, Annales des 

 Sciences Naturelles, Zoologie, ser. 2, vol. 9, pp. 1-11, pi. 6, fig. 1 ; pi. 7, fig. 1. 1891. 

 HABMEE, On the British species of Crisin, Quarterly Journal of the Microscopical 

 Society, new ser., vol. 32, pi. 12. 1,893. HABMER, On the occurrence of embryonic fis- 

 sion in Cyclostomatous Polyzoa, Quarterly Journal of Microscopical Science, new 

 ser., vol. 34, pis. 1-3. 1900. CALVET, Contributions a. 1'liistoire naturelle des Bryo- 

 zoaires ectoproctes inarins, Travaux Institut zoologie Universite Montpellier Stat 

 Marit, Catle, new ser., Memoire No. 8, pi. 7, fig. 15 ; pi. 8, fig. 22 ; pi. 10, figs. 15-20. 

 1914. WATERS, The Marine fauna of British East Africa and Zanzibar, Proceedings 

 of the Zoological Society of London, p. 834, pis. 55, figs. 5, 6. 1916. WATERS, Some 

 Species of Crisia, Annals and Magazine of Natural History, ser. 8, vol. 18, p. 

 470, pi. 16. 



The ovicell is regular, symmetrical, sacciform, isolated. The oeciopore is termi- 

 nal, as large as the aperture of the tubes. The zoarium is articulated and radicated. 



This family is often erroneously attributed to Busk, 1859, but it was established 

 in 1847 by Johnston under the name of Crisiadae. The terminology adopted has 

 no importance from the standpoint of priority, since scientific observation alone 

 ought to be considered. 



The best known genus of this family is Crisia. Perhaps it will be necessary 

 to erect a distinct genus for the Crisia denticulata group which is without a salient 

 oeciostome. It is evident that here the function of the escape of the larvae has 

 become different. 



We possess rather good anatomical material of this family but unfortunately 

 the determination of the specimens is always laborious and often doubtful. 



The bathymetric distribution of the Crisiidae is deceiving. They live in fact 

 on marine algae and 

 after death fall to 

 greater depths often 

 very far from their 



place of origin. /'_ ' .//. segment 



Genus CRISIA Lamouroux, 



1816. 'I ^ - tube 



1816. Crisia LAMOU- 

 BOUX, Historic 

 des Polypiers 

 C o r a 1 li g feues 

 flexibles, p. 136. 



The zooecia are bi- 

 serial. 



Genotype. Crisia 

 (Sertularia) e'burnea 

 Linnaeus, 1758. 



Range. Lutetian. Fl - 231. Genus Crisia Lamouroux, 1816. 



Recent. A branch showing the terminology in this genus. 



--/-^;-- oeciostome 



base of branch 



