102 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9i 



PlJlTE 22 



1,2. Patellispongia. oculata Bassler: Portion of the type, a broad lamellar 

 expansion showing upper surface with regularly but widely spaced 

 pores about 1 nun. in diameter and enlarged view ( X 6) with spicular 

 structure between pores more visible. (See also pi. 24, figs. 1, 2.) 



3-5. Hesperocoelia undulata Bassler : Side and edge views of the flat, undulated 

 frond (3, 4) pierced by a row of oval openings representing the cloaca, 

 and surface of same, X 6, exhibiting size and distribution of the minute 

 pores and the intermediate .spicular tissue (5). (See also pi. 24, fig. 8.) 



6-8. Hesperocoelia typicalis Bassler: The flattened flabellate type specimen (G) 

 traversed by longitudinal canals representing the cloaca emerging at 

 the upper thin end (7) and view of surface X 6 (8) exhibiting pores 

 and intermediate tis.sue. (See also pi. 24, fig. 9.) 



Plate 23 



1,2. Strepioaolen occidentuJis Bassler: Side of one of the types exhibiting 

 irregularly spaced canal openings and top of larger example showing 

 wider central osculum and tubes larger than in the type species. 



3-6. Archaeoscyphia minffanensis (Billings) : Drawing of a restored specimen 

 about one-half natural size (3) and .sketches of three forms of spicules, 

 X SO (4-6). Chazyan (Mingan) : Mingan Islands (after Billings, 

 1865). 



7,8. AnthaspideUa traini Bassler: The type, an incomplete specimen tshowing 

 the large, coar.se, rather widely spaced clusters (7) and spicular struc- 

 ture exhibited on etched surface, X 20 (8). 

 9. Anthaspidella cUntoni Bassler : Part of surface of type exhibiting com- 

 paratively small size and close arrangement of the clusters consisting 

 of oscula and radiating canals. 



Plate 24 

 (Thin sections, all X 9, with structure emphasized by shading in some cases.) 



1,2. Patellispongia oculata Bassler: Vertical and tangential sections showing 

 arrangement of canals and spicular meshwork. (See also pi. 22, figs. 

 1.2.) 

 3. CahjcocoeUa typicalis Bassler: Section crossing canals and spicular mesh- 

 work, illustrating size and length of spicules. (See also pi. 21, figs. 3-5.) 



4, 5. Lissocoelia ramosa Bassler : Tangential section near surface v/here minute 

 pores and fine spicular structure are best shown and vertical section 

 through wall with canals and meshwork. (See also pi. 19, figs. 9-11.) 



6, 7. tievailocoeUa tvistae Bassler : Part of vertical section with several canals. 

 Most of the spicules are cut so as to show in white points (6). Tan- 

 gential section (7) through pores and spicular mesh, with a sketch 

 X 15. (See also pi. 19, figs. 6, 7.) 



8. Hesperocoelia undulata Bassler : Transverse section through cloaca with 



canals and usual tissue, with a small sketch of spicular structure, X 20. 

 (See also pi. 22, figs. 3-5.) 



9. Hesperocoelia typicalis Bassler: Cross section through cloaca with canals 



and spicular structure; and small portion of the latter X 20. (See also 

 pi. 22, figs. 6-8.) 



U. S. 60VERNHENT FRINTING OFFICE; 1941 



