231 



EXPLANATION OF PLATES. 



Plate L 



Fig. I- Crateromorpha lankesteri, sp. n. | nat. size. 



Fig. 2. Dermal membrane, X 2. 



Jt^ig^- 3- Gastral and hypo-gastral layer, X 2. 



Fig. 4- Transverse sectiqn of stalk of smallest specimen, X '^^ 



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



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



Fig. 8. Gastral pentact, X 140. 



Fig. 9. Dermal pentact from stalk, X 140- 



Fig. 10. Hypogastral hexact, X 140. 



Fig. II- Oxyhexaster, X 400. 



Plate II. 



Fig. I. S pongocardium 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 honaventura, sp. n- Natural size- 

 Fig"- 3- Tetilla casiila, Carter. Natural size- 

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



Fig. 4- Pachastrella caliculata, sp. n. Reduced to ^ nat- size. 

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

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



Plate III. 



Fig. I. S pongocardium gilchristi. a- Oxea, X 25, 

 b. Smaller oxea, X 25. 

 c Protrisene, X 25 ; c', head of c, X lOO- 



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



e. Two orthodiaenes^ X 25. 



f. Oithomonaene, X 25. 



g. Anatrisene^ X 25 ; g', head of same, X 100- 

 h- Head of trichodal protrisene, X 425- 



k. Trichodal prodigene, X 100; k'. head oik, X 425- 

 l Large sigmaspires, X 425- 

 m. Smaller sigmaspires, X 425- 



