96 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 91 



pores in 4 mm. measured lengthwise and 8 rows in the same space 

 transversely. 

 Holotype.—V.S.'NM. No. 79635. 



Genus LISSOCOELIA Bassler 



Smooth, cylindrical, hollow stems, branching dichotomously usually 

 in the same plane but at irregular intervals, constitute the growth 

 in this genus. The smooth surface under the lens shows minute 

 rounded pores penetrating the spicular tissue as in other members of 

 the family. These are the openings of the oscula, which in thin 

 sections are seen to be closely arranged tubes arising from the basal 

 wall and gently bending to the surface at a low angle. The cloaca 

 is narrow and extends the full length of the sponge. 



Genotype. — Lissocoelia rmnosa Bassler. 



LISSOCOELIA RAMOSA Bassler 



Platte 19, Figures 9-11 ; Plate 24, Figxikes 4, 5 



Sponge body of smooth hollow stems, usually about 11/2 cm. wide 

 although increasing to 2 cm. at the place of branching, which occurs 

 at intervals of 3 cm. or more, often but not always in the same plane, 

 a complete growth being 10 cm. in diameter. The cloaca throughout 

 averages 0.5 cm. in width. Surface smooth, marked by minute 

 rounded pores about 0.20 mm. in diameter, distributed equally 

 throughout the spicular tissue at distances of 2 to 3 times their own 

 width. Spicules exceedingly minute but apparently with the same 

 structure as in the family. Sections show the cloaca varying from 

 3 to 5 mm. in diameter, with the oscula arising from the basal sponge 

 wall as narrow parallel tubes bending in a gentle curve to the surface. 



This, one of the commonest of the Nevada sponges, is easily recog- 

 nized by its cylindrical branching stems with the markedly smooth 

 surface and very minute pore structure. 



Cotypes.—V.^.'^M. No. 79636. 



Genus CALYCOCOELIA Bassler 



Sponge arising from a blunt broad peduncle into a goblet-shaped 

 body, which increases rapidly in width from below upward and then 

 opens at the upper surface in a deep excavation representing the 

 cloaca. Surface smooth but marked by minute, rounded pores, the 

 oscula arranged closely in rows parallel to the sponge length, these 

 representing openings of internal regularly arranged canals separ- 

 ated by a spicular meshwoi-k as in related genera but with the spicules 

 exceptionally long and narrow rayed. 



Genotype and only species. —CalycocoeUa typicalis Bassler. 



