118 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol.61. 



CRISINA NORMANIANA D'Orbigny, 1852. 



Plate 20, figs. 9-14. 



1852. Crisina noi-maniana d'Orbigny, Paleontologie frangaise, Terrain 

 Cretace, vol. 5, p. 914, pi. 612, figs. 1-5. 



D'Orbigny's figure is perfectly exact. The dorsal is usually orna- 

 mented with three sulci alone. The zoarium is much smaller than 

 that of Crisina triangularis. 



D'Orbigny's figured type came from Fecamp, which has yielded 

 our figured specimens also. The ovicell has been discovered in the 

 material coming from a geode. This remarkable locality, extraor- 

 dinarily rich in bryozoa, is celebrated for its geodes of flint; on 

 breaking these their interior shows multitudes of bryozoa and sponge 

 spicules, admirably preserved. 



This ovicell is globular and of the type of Ascosoecia; it incloses 

 the transverse and opposite lines on the full zoarial width. The 

 peristomes are longer, larger, and are not so adjacent, exhibiting 

 therefore the same structure as in the genus Poly ascosoecia. The 

 only difference is in the position occupied by the ovicell. 



The sections are identical with those of Crisina triangularis 

 D'Orbigny, a larger and more easily sectioned species. 



Occurrence. — Cretaceous (Coniacian) : Fecamp (Seine inferieure), 

 France. 



Plesiofy pes.— Canu collection and Cat. No. 68963, U.S.N.M. 



CRISINA TRIANGULARIS D'Orbigrny, 1851. 

 Plate 20, figs. 15-21. 



1851. Crisina triamtularls d'Orhigny, Paleontologie frangaise, Terrain cre- 

 tace, vol. 5, Bryozoaires, p. 915, pi. 612, figs. 11-15 ; pi. 769, figs. 11-14. 

 1851. Crisina ligericnsis d'Orbigny, Paleontologie frangai^. Terrain cre- 



tac§, vol. 5, p. 265, pi. 614, figs. 11-15. 

 1899. Retecava creiacca Gregory, Catalogue of the Cretaceous Bryozoa in 

 the British Museum, vol. 1, pi. 9, fig. 8 (not synonymy). 

 Gregory identified this species with Idmonea ccnomana D'Orbigny, 

 1851. This is incorrect, as is also his synonomy. However, he gives 

 a figure under the name Retecava cretacea^ which does not correspond 

 at all to the text and which, if it is correct, represents Crisina tri- 

 angularis. The Canu collection contains a great number of D'Or- 

 bigny's species, collected at the same localities. Their study shows 

 that Gregory's synonymy for Crisina triangularis and for Retecava 

 cretacea is absolutely incorrect. The figures of D'Orbigny are very 

 accurate for the present species, and there is little to be added to 

 his description. 



In vertical section the tubes are short with peristome, with tri- 

 parietal gemmation, oriented, someAvhat club shaped; the walls are 

 much dilated at their extremity, forming a thick frontal. The 



