94 PROCEEDINGS OF THE NATIONAL MUSEUM vol. »i 



The genotype and only species, A. minganensis^ is not any too well 

 known, but judged from the description and illustrations by Billings 

 and Hinde the type specimens, although not well preserved, appear to 

 have tlie characters mentioned above. 



ARCHAEOSCYPHIA MINGANENSIS (Billings) 



Plate 23, Figotes 3-6 



Petraia vduganensis Billings, Can. Nat. and GeoL, vol. 4, p. 346, 1859. 

 Archaeocyathus tninganensis Billings, Paleozoic fossils, Geol. Surv. Canada, 



vol. 1, p. 354, figs. 342, 343, 1865. 

 Ethmophyllum minc/anensc Walcott, U. S. Geol. Surv. Biill. 30, p. 77, figs. 



6-8, 1886. 

 Archeoscyphia minganensis Hindk, Quart. Journ. Geol. Soc. London, vol. 45, 



p. 143, pi. 0, figs. 12-14, 1889.— Rauff, Paleoutographica, vol. 40, p. 240, 



pi. 1, figs. 1-10, 1894 (see for complete bibliography). — Twenhoffx, Geol. 



Soc. Amer. Special Pap. 11, p. 34, 1938. 



In spite of the various researches upon this species and its ref- 

 erences to several divisions of the animal kingdom, its exact structure 

 has not yet been confirmed because of a lack of good study material. 

 However, the several figures on plate 23 copied from Billings and 

 practically the same as given in all the references, show that Ar- 

 chaeoscypliia is a sponge possessing the same general type of structure 

 as the other genera here referred to the family. 



Cha.zyan (Romaine form.ation) : Montague (Big Romaine) Island 

 (Mingan Islands), St. Lawrence River, Quebec. 



Genus NEVADOCOELIA Bassler, 1927 



Simple, erect, obconical to oval, pedunculate sponges pierced 

 throughout their length by a cloaca about one-third the width and 

 marked on the outer surface by transverse parallel ridges or rows of 

 nodes. Pores (oscula) of sponge wall small, appearing at the surface 

 in more or less closely spaced parallel rows and on the interior as 

 canals arising from the cloaca and bending gradually to the surface 

 with the intervening spaces composed of the usual spicular structure 

 characteristic of the family. 



Genotype. — Nevadocoelia. wistae Bassler. 



NEVADOCOELIA WISTAE Bassler 



PL.VTE 19, Figures 6, 7 ; Plate 24, Figxjkes 6, 7 



Sponge elongate, cylindrical to oval, arising gradually from a 

 narrow base to a length of 12 cm. or more and a width of 4 cm., 

 with the cloaca about 13 mm. in diameter. Surface marked by un- 



