Plate VIL 



Caulophacus lotifolium Ij. Pp. 87-96. 



Fig. 1. The tyj->e specimen, now preserved in the " Kgl. Naturalien 



Kabinet" in Stuttgart. About i natural size. 

 Fig. 2. Gastral hexactinic pinule of average size. 300 x . 

 Fig. 3. Dermal hexactinic pinule of average size. 300 x . 

 Figs. 4, 5. Normally developed, thick-rayed discohexasters from subdermal 



or subgastral region. 300 x . 

 Fio-. G. Hemihexactinose form of same. 300 x . 

 Figs. 7, 8. Hexactinose form of same ; from deep parts. 300 x . 

 Figs. 9-11. Pentactinic dermalia from the lower part of stalk. 300 x . 

 Figs. 12-16. Slender-rayed discohexasters, which pass over by gradations 



into the forms of figs. 4-8. Figs. 14-16, onychaster-like. From 



peripheral region of the sponge. 300 x . 

 Fig. 17. Central part of a hexactinose discohexaster, showing the extent 



of the axial cross. Observed in glycerine. 1000 x . 

 Fig. 18. Part of a section through the sponge, with soft parts preserved. 



Above, dermal layer (ectosome). sd. s. subdermal space. Below, 



periphery of choaoosome. ex. c, excurrent canal 50 x . 

 Fig. 19. Dermal skeleton, seen surftice on. Beneath the dermal latticework, 



the hypodermal lattice with larger meshes. 50 x . 

 Fig. 20. Surface of the stalk in oblique view. Above, the crowded layer 



of balloon-shaped pentactinic dermalia. 50 x . 

 Fig. 21. Part of a section, adjoining the gastral surface. Below, gastral 



layer. 50 x . 



