PLATE VII. 



P S A M M I N I D JE. 



Figs. 1A-1D. Psammina plakina, n. sp. (p. 35). 



Diam. 

 Fig. 1A. Facial view of the discoidal sponge, . . . . . . . x 5 



Fig. IB. Marginal view of the same, . . . . . . . . x 5 



Fig. 1C. Vertical section through the discoidal sponge, g, its gastral cavity; o, exhalent opening 

 (osculum) ; i, inhalent openings (dermal pores) ; A-, flagello-chamhers ; e, eggs (partly in 

 segmentation); x, xenophya (Globigerina shells); x', upper plate of the pseudo-skeleton; 

 *", lower plate of the same, . . . . . . . x 70 



Fig. ID. A small portion of the same section ; more highly magnified. Characters as in fig. 1C, . x 200 



Figs, 2A-2D. Psammina globigerina, n. sp. (p. 36). 



Fig. 2A. Facial view of the discoidal sponge (superior face). The whole surface is protected by a 



carapace composed of Globigerina shells, . . . . x 20 



Fig. 2B. Marginal view of the same, exhibiting the corona of exhalent openings (o), on the peripheral 



edge of the discoidal sponge, . . . . . . . x 20 



Fig. 2C. Horizontal section through the discoidal sponge, exhibiting the radiating network of the 

 symbiotic Hydroid, expanded in the medullar substance, between the two parallel 

 cortical plates, . . . . . . . . x 20 



Fig. 2D. A portion of the medullar parenchyma, after the removal of the calcareous shells by 

 hydrochloric acid. Two different branched canal-systems are visible, the yellowish 

 canals of the sponge, not anastomosing (c), and the dark greenish brown reticular 

 canals of the symbiotic Hydroid (h). The maltha includes some Eadiolarian tests (>•), x 200 



Fig. 3. Psammina nummulina, n. sp. (p. 37). 



Fig. 3. After removal of the upper dermal plate, the soft medullar disc is visible, in which the 



network (/<) of the symbiotic hydrorhiza (Sti/lactis?) is expanded, . . . x 4 



Figs. 4A, 4B. P-<an. ■na rmliolarium, n. sp. (p. 41). 



Fig. 4A. Lateral view of the sponge, . . . . . • • . x 2 



Fig. 4B. Basal view of the same, . . . . . . • • . x 2 



Fig. 5. Psammopemma calcareum, n. sp. (p. 41). 

 Fig. 5. The turbinate sponge, seen half from above, half from the lateral side, . . . x 3 



Figs. 6A, GB. Holopsamma argillaceum, n. sp. (p. 39). 

 Fig. 6A. Lateral view of the sponge ; o, oscula, . . . . • • . x 2 



Fig. 6B. Vertical section through the sponge, exhibiting the branched canals (c) and their oscula (o). 



x, xenophya, . . . . . . • • ■ . x 5 



Figs. 7A-7C. Holopsamma cretaceum, n. sp. (p. 39). 



Fig. 7A. Superior view of the sponge, drawn by Miss Traill, ..... nat. size 



Fig. 7B. Inferior view of the same, ....... nat. size 



Fig. 7C. A branched canal of the sponge, isolated after the removal of the calcareous pseudo-skeleton, x 20 



