CYCLOSTOMATOUS BRYOZOA CANU AND BASSLEK 



39 



In transverse section the tubes are polygonal, with thin walls 

 adjacent. The tubes adjacent to the lamella are small, because 

 they correspond to the inferior part of the tubes. 



Occurrence. — Lower Cretaceous: Sainte-Croix (Vaud), Switzer- 

 land; Hauterivian, Censeau (Doubs) , France (Valangian) , Fontenay 

 and Auxerre (Yonne) , France (Rhodonian) . 



Plesiotypes.—C&t. No. 69884, U.S.N.M. 



TRIGONOECIA HAIMEANA De Loriol, 1863 



Plate 1, figs. 6-12 



1863. ReptomuUisparsa haimeana De Loriol, Les Invertebres du Neocomien 

 inf^rieur du Mont Saleve pres Geneve, vol. 2, p. 136, pi. 17, fig. 4. 



1883. ReptomuUisparsa haimeana Keeping, Fossils of the Neocomian of Upware 

 and Brickhill (Cambridgeshire and Bedfordshire), p. 137. 



1899. ReptomuUisparsa haimei Gkegort, Catalogue of Cretaceous Br^yozoa in 

 the British Museum, vol. 1, p. 117, fig. 5. 

 Measurements. — 



Diameter of aperture 



Diameter of peristome . 



Diameter of tubes 



Distance of peristomes.. 

 Separation of peristomes 



Ste.-Croix 



Mm. 

 0.10 

 .16 

 .20 

 .72-. 

 .72 



80 



Faringdon 



Mm. 

 0.10 

 .16 

 .20 

 .64 

 .48-. 60 



Gregory 



Mm. 

 0.10 



Type 



Mm 

 0.10 



20- .25 

 . 60-1. 00 



. 18- 22 



Affinities.— 'De Loriol's type is not very well preserved, but our 

 specimens, which we have compared with it, are much better. 



The zoarium incrusts sponges and shells over considerable surfaces 

 (fig. 6) . The large transverse overlapping wrinkles characteristic of 

 the species have been observed in specimens from Sainte-Croix (fig. 7), 

 as well as Faringdon (fig. 10). The ovicell is triangular, very convex, 

 and quite similar to that in other species of the genus. Its dimen- 

 sions are quite variable, varying from once to twice the size. The 

 ovicell shown in Figure 12 is the largest one observed. 



Occurrence. — Lower Cretaceous: Varappe, near Geneva, Switzer- 

 land (De Loriol) (Hauterivian), Sainte-Croix (Vaud), Switzerland 

 (Valangian) ; Faringdon and Upware, England (Aptian) . 



Plesioty pes. —Cat. Nos. 69885, 69886, U.S.N.M. 



TRIGONOECIA (MESENTERIPORA) NEOCOMIENSIS D'Orbigny, 1853 



Plate 2, fig. 11 



1853. Mesenteripora neocomiensis D'Orbigny, Pal6ontologie frangaise, Terrain 

 Cretace, vol. 5, p. 808, pi. 756, figs. 7-9. 



Measurements. — Diameter of orifice, 0.14-0.16 mm.; diameter of 

 peristome, 0.18-0.20 mm.; distance of peristomes, 1.00-1.20 mm.; 

 separation of peristomes, 0.70 mm. 



