1 06 Mr. Id . J . Carter on the known Species of Spongilla. 



Fig. 5. S. multiforis, n. sp. External view of entire statoblast : a, cliiti- 

 nous coat ; bb, layer of minute spinous acerate spicules (crust 

 almost obsolete) ; ccc cc, apertm-es ; cl, more magnified view of 

 spinous acerate. 



Fig. 6. Meyenia j)lu))iosa. Perpendicular section of tlie statoblast througli 

 the aperture : a, cavity filled with germinal matter ; b, coat 

 enclosing the same ; c, chitinous coat ; d, crust ; e, birotulate 

 spicules in situ ; f, aperture ; g, nipple-like prolongation of b ; 

 h, birotulate spicule, more magnified j i, disk, end view ; k, stel- 

 late form of flesh-spicide. 



Fig. 7. Tuhella remirvata. Perpendicular section of the statoblast tlii'ough 

 the aperture : a, cavity filled with germinal matter ; b, coat 

 enclosing the same ; c, chitinous coat ; d, crust ; e, tubelliform 

 or trumpet- like spicules in situ ; /, capsule of equal-ended denti- 

 capitate spicules in situ ; g, aperture ; h, nipple-like prolongation 

 of b ; i, more magnified view of tubelliform spicule ; k, the same 

 of equal-ended denticapitate spicule ; I, still more magnified end 

 view of head of same. 



Plate VI. 



Fig. 8. Tubella reticulata. Perpendicular section of the statoblast through 

 the aperture : a, cavity filled with germinal matter ; b, coat 

 enclosing the same ; c, chitinous coat ; d, crust ; e, trumpet-like 

 spicules in situ ; /, aperture ; g, nipple-like prolongation of b ; 

 h, more magnified view of trumpet-like spicule ; i, the same of 

 large disk, end view ; k, the same of small disk, end view ; I, 

 small spinous skeleton-spicule forming a capsular layer to the 

 statoblast ; m, skeleton-spicule smooth or sparsely spined ; », 

 more magnified view of /. 



Fig. 9. T. sjnnata, n. sp. Perpendicular section of statoblast through 

 the aperture : a, cavity filled with germinal matter ; b, coat 

 enclosing the same ; c, chitinous coat ; d, crust ; e, trumpet- 

 shaped spicules in situ ; /, aperture ; g, nipple-like prolongation 

 of b ; h, more magnified view of trumpet-shaped spicule with 

 spinous shaft ; t, large disk ; k, small disk, denticulated, end 

 view ; /, the same, still more magnified, lateral view ; m, flesh- 

 spicule, spinous acerate. 



Fig. 10. T. pauhda : a, trumpet-shaped spicule, lateral view ; b, large 

 disk, end view ; c, another form of the trumpet-like spicule. 

 Scale l-12th to l-6000th inch. 



Fig. 11. Meyenia Jluviatilis : a, birotulate spicule, lateral view ; b, denti- 

 culated disk, end view. Same scale. 



Fig. 12. Tubella anotiyma, n. sp. External view of statoblast of unknown 

 sponge : «, striated coat ; b, reticulated structure resting on the 

 same ; c, aperture ; d, reticulated structure, more magnified, to 

 show that it is composed of minute, erect, conical bodies in 

 relief on the striated coat, having a spicule in the middle of 

 the interstice ; e, more magnified lateral view of spicule ; /, 

 fragment of coat of germinal matter, showing polygonal reticu- 

 lation. 



Fig. 13. Spongilla Lordii. Lateral view of entire statoblast : a, body or 

 chitinous coat; b, neck, ending in c, aperture; (/, coating of 

 acerate spicules ; e, more magnified view of spicule ; f, group of 

 statoblasts i7i situ, magnified three diameters. 



Fig. 14. S. lacustris. Skeleton-spicule, to show the " gradually-pointed " 

 form. 



