NEVADA FOSSIL SPONGE FAUNA — BASSLER 95 



dulating, more or less parallel, transverse ridges 1 to II/2 mm. wide 

 and 21/2 "im. apart, with 7 occurring in 3 cm. Sponge pores averag- 

 ing 0.35 mm. in width, separated by about their own diameter and 

 opening on outer surface in more or less regular longitudinal rows. 

 In longitudinal section the pores arise at the cloaca and bend gi'adu- 

 ally upward at an angle of about 30° to the surface. 

 Cofypes.—U.S.'NM. No. 79632. 



NEVADOCOELIA TRAINI Bassler 



Plate 19, Figxjres 1-5 



General characters as in the preceding species, but the growth 

 occurs in shorter, broader sponge bodies, averaging 8 cm. long and 

 4 cm. wide, with the cloaca about 12 mm. in diameter and the surface 

 marked by sharp nodes instead of parallel transverse ridges. Six 

 nodes occur on an average in 2 cm., measured transversel5^ Pore 

 structure very similar to the preceding species. In the several hun- 

 dred specimens of this and the preceding species no intermediate 

 forms were noted, so that the surface ridges and nodes seem to be 

 good specific characters. 



Ootypes.—U.S.'NM. No. 79G33. 



NEVADOCOELIA GRANDIS Bassler 



Plate 19, Figuke 8 



Sponge not unlike N. unstae in growth and external structure but 

 much larger and with more separated and broader transverse ridges, 

 4 of which occur in 3 cm. The cloaca is about 3 cm. wide, but the 

 pores piercing the outer surface have the same size and arrangement 

 as in the genotj-pe. The type specimen, 15 cm. long and 9 cm. wide, 

 represents only the upper third of the entire sponge, so it might be 

 only a giant form of N. wistas, but a smaller complete example (15 

 cm. long and 7 cm. wide, with cloaca also 3 cm. in width) shows the 

 transverse ridges equally large and distant from each other. 



Eolotype.—U.S.'NM. No. 79634. 



NEVADOCOELIA PULCHRA Bassler 



Plate 20, Figures 1-4 



Sponge oval, 7 cm. in greatest diameter and more than 11 cm. 

 high, with the cloaca 1.5 to 3 cm. wide. Outer surface marked by 

 unusually strong ridges, which grow into wide, ascending, fiangelike 

 expansions 5 mm. wide and distant at least 1 cm. from each other. 

 Pore arrangement and size as in other species of the genus, with 6 



