EXPLANATION OF PLATES 



[All the specimens figured are fi'oin the Upper Pogonip (Chazj-an) limestone, 

 half a mile south of Ikes Canyon, 4 miles west of Dianas Punch Bowl, Roberts 

 Mountain quadrangle, Nev. Unless otherwise stated, the figures are natural 

 size.] 



Plate 19 



1-5. Nevadocoelia traini Bassler : (1) View of upper two-thirds of type, show- 

 ing the characteristic sharp nodes of the surface: (2) surface, X 6, 

 with nodes and pores (oscula) ; (3) cross section of top showing width 

 of cloaca; (4, 5) two vIcavs of three illustrating canals, X G, their open- 

 ing at the surface in definite rows, and spicular tissue. 



0, 7. 'Nevadocoelia wistae Bassler : The type specimen, illustrating the some- 

 what closely spaced, narrow, more or less parallel transverse ridges and 

 view of the surface. X 6, showing pores and spicular structure. (See 

 also pi. 24, figs. 6, 7.) 

 8. Nevadocoelia grandis Bassler : Portion of the type illustrating the large 

 dimensions and the strong, widely-spaced surface ridges. 

 {>-ll. LiHsocoelia ratnosa Bassler: The tyi^e (9) a smooth cylindrical branching 

 stem, with end view (10) showing its hollow nature, and surface, X (3 

 (11) illustrating spicular structure and minute rounded pores. (See 

 also pi. 24, figs. 4, 5.) 



Plate 20 



1-4. Nevadocoelia pulchra Bassler: Side and top viVns of the type (1, 2) 

 illustrating the wide, flangelike, ascending expansions and the central 

 cloaca, with enlarged views (3, X 6 ; 4, X 20) exhibiting the rows of 

 minute pores and spicular structure. 



5-7. PatelUspongia rlintoni Bassler: The type specimens, parts of saucer-shaped 

 unilamellate expansions (5, 6) and surface, X 6 (7) showing the pores 

 widely separated by spicular tissue. 



Pl^\TE 21 



1.2. PateUisponyia nilnutipora Bassler: Upper surface of type, a fragment of 

 a thin lamella, and surface, X 6, illustrating the minute closely spaced 

 pores with intervening spicular tissue. 

 3-5. Calycocoelia typicalis Bass!er : (3, 4) Side and top views of this goblet- 

 shaped sponge with several areas of oscula darkened to show arrange- 

 ment ; (5) surface view, X 20, showing the oscular pores and the spicu- 

 lar structure. (See also pi. 24, fig. 3.) 

 6. PatelUspongia magnipora, new species: Portion of the type, a unilamellate 

 expansion, and a small portion, X 6. illustrating large, widely spaced 

 pores in broad areas of spicules. 

 7. Hyalostelia ? species: View of needle-like rods, some 50 mm. long, occur- 

 ring in thick layers, accompanying the various species of sponges herein 

 described. 



101 



