231 



EXPLANATION OF PLATES. 



Plate L 



tig. I. Crateromorpha lankcstcri, sp. n. -^ nat. size. 



Eig. 2. Dermal membrane, X 2. 



Eig- 3. Gastral and hypo-g-as^tral layer, X 2. 



Eig. 4- Transverse sectiqn of stalk of smallest spcciiucn, X 2. 



Eigs. 5, 6. Parenchymal diacts, X 140. 



Eig. 7. Large solitary diact of stalk, X 140- 



Eig. 8. Gastral pentact, X 140. 



Fig. 9. Dermal pentact from stalk, X I40- 



Eig. 10. Hypogastral hexact, X 140. 



Eig. II- Oxyhexaster, X 400. 



Plate IL 



Eig. I. Spongocardiiim gilchristi, gen et sp- n- Reduced to § nat. 



size- a, poral vestibule; b, oscular cloaca. 

 Fig. lA. Vertical section of a smaller specimen- Natural size- 

 Fig. 2. Tetilla honavenUira, sp. n- Natural size- 

 Fig- 3. Tetilla casnla, Carter. Natural size- 

 Fig- 3A. The same, in vertical section. 



Eig. 4- Pachastrella caliculata, sp. n. Reduced to -J nat- size. 

 Fig. 5- Pachastrella isorrhopa, sp. n- ^ nat. size. 

 Eig- 6. Stelletta horrens, sp. n. ^ nat- size. 



Plate IIL 



Eig. I. Spongocardium gilchristi. a- Oxea, X 25. 



b. Smaller oxea, X 25. 



c. Protriaene, X 25 ; c', head of c, X lOO- 



d. Orthotrigenes ; d', plagiotriaene, X 25. 



e. Two orthodiaenes^ X 25. 



f. Orthomonsene, X 25. 



g. Anatrisene^ X 25 ; g', head of same, X loo- 

 h- Head of trichodal protriaene, X 425- 



k. Trichodal prodiaene, X 100; k', head of ^, X 425- 

 /. Large sigmaspires, X 425- 

 VI. Smaller sigmaspires, X 425- 



