On some West-Indian and Acapulco Sponges. 



x(j. 14. Fibidaria anchurata, n. sp. a, skeletal spicule; h, biluimates ; 

 c, anchorate ; d, the same, more magnified, lateral view ; e, 

 sand-grains. 



Fi(j. 15. Phorbas ainaranthus, spicule of. 



Fi(j. 10. Esperia Icsvis, n. sp. a, skeletal spicule ; b, inequianehorate, front 

 and lateral vievv^s ; c, bihamate ; d, bundle of triehites ; e, minute 

 inerjuiauchorate ; /, the same, more magnified, to show the sharp 

 process of the shaft extended downwards. 



Fi(/. 17. Esperia OmDuiiyhami, u. sp. a, skeletal spicule ; h, variously 

 formed head in the same ; c, inequianehorate, front and lateral 

 views ; d, ? bihamate ; e, tricurvate ; /, bundle of triehites ; g, 

 more maguified view of lower end of inequianehorate, to show 

 extension of petaloid arm upwards into a sharp process ; h, 

 more magnified view of ? bihamate, to show its shape. 



Fig. 18. Esperia obscura, u. ep. a, inequianehorate ; b, the same, more 

 magnified, in difl'erent views, tosliowits enigmatical appearance. 



Fig. 19. Esperia, minute <?(/w/anchorate in several species of, « ; b, more 

 maguified view, to show its shape. 



Fig. 20. Ilymedesmiu Johitsuni, Bk. a, skeletal spicule; 6, tricurvate ; 

 c, "trenchant" anchorate in natural position, lateral view; d, 

 the same, diagrammatic, to show its shape ; e, earliest visible 

 form. 



Fig. 21. Ilymedesmia Schtnidfii, Carter, n. sp. a, skeletal spicule; b, 

 bihamate ; c, d, e, the same as just mentioned, this form being 

 common to both species. 



Plate XII. 



Fig. 22. Donatia nndtijida, n. sp., natural size. a a, sponges ; b b b b, 

 tendrils of attachment ; ec, bivalve shells, covered with a njelo- 

 besian incrustration ; d, spiuiferous stellate ; e, small sexradiate 

 stellate ; f, pistil-like process, of the centre. 



Fig. 23. Duvutia, Cape species. Spiniferous stellate. 



Fig. 24. JJesmacidoa titubans, Sdt. a, skeletal spicule ; b, subskeletal 

 spicule; c, bihamate; f/, anchorate ; e,f,g, difierent views of 

 the anchorate, more magnified, to show its «y?«'terminal shape, 

 &c. ; It, ro.sette form. 



Fig. 25. Spongia Dy.'^oni, Bk. a, skeletal spicule ; b, spiuispirula ; r, the 

 same, more magnified. 



Fig. 20. Cliona caribbcea, n. sp. a, skeletal spicule ; b, spinispirula ; c, the 

 same, more magnified. 



Fig. 27. Suherites coroitarius, n. s'p. a, skeletal spicule; b, spini.spirula ; 

 c, the same, more magnified. 



Fig. 28. Akyonium purpureum, Lam. c/, skeletal spicule ; 6, spinispirula ; 

 c, the same, more magnified. 



Fig. 29. Terpiosfiiya.r, spicule of. 



Fig. 30. Ter-jjios C(eridea,u.s\f. «, spicule of ; 6, Oscillatorian filament ; c, 

 the same, more magnified. 



Fig. SI. Geodia gibherosa, ham. Zone-spicule of. 



^V^. 32. Xenospoiiyia putellifortnis. a, skeletal spicule ; b, stelliform fiesh- 

 spicule, largest size ; c, the smallest size seen. 



Fig. 33. Placospiiiigia riielobesiuidcs. «, skeletal spicule ; b, head of same, 

 of a tiifterent form ; c, large siliceous ball, elliptical ; d, small 

 siliceous ball, spherical : e, f, spinispirulas ; g, surface of large 

 siliceous ball when fully developed, much magnified; /(, spherical 

 ball, more magnified ; /, spiuispirula, more nuigiiified, to show its 

 spines &c. 



