210 KOYAL SOCIETY OF CANADA 



Plate II. 



Fig. \.~Des)tiacidon ))altitat(i ipa^e 192). One-half the natural size. 



Fig. la. Oxeote spicule ; < 272. 



Fig. Ih. Stylus : x 272. 



Figs. Ir, Id, \e. If. Lsochela> ; x 272. 

 Fig. 2.— Clafhria (Jcliaifn {pa.(j:e 19i). Natural size. 



Fig. 2n. Suhtylostylus : x 272. 



Fig. 2b. Slender stylus ; x 272. 



Fig. 2c. Echinating suhtylostylus ; x 272. 



Figs. 2d, 2e, 2/, 2g. Isochehv ; x 272. 



Fig. 2/1. Toxa ; x 272. 

 Fig. 3. — Phakellla vcntilabrum (page 194). One half the natural size. 



Fig. 3o. Stylus ; x 13fi. 



Fig. 3fo. Slender stylus ; x 136. 

 Fig. 4. — Suheritcs ficus (pn.°:,e 195>. One-half the natural size. 



Fig. \(t. Tylostylus ; x 272. 



Figs. 4^>, 4r. " In flato-cyliTulrical" spicules ; x 272. 



Fig. .5. — Suberites hi.spidus (page 196). Natural size. 



Fig. .5«. Tylostylus, from a fibre of the main skeleton ; x 60. 



Fig. nb. Tylostylus from the dermal layer of the cortex ; x 272. 



Fig. he. Tylostylus from the inner cortical layer ; x 212. 



Fig. 5rf. Head of projecting tylostylus ; x 272. 

 Fig. G.—Polymnsfin robusfa (page 197). Natural size. 



Fig. (kf. Tylostylus ; x 136. 



Fig. iSb. Cortical tylostylus ; x 272. 

 Fig. ~. — Trichoste77ima hemisphcericum (page 199). Natural size. 



Fig. la. Tylostylus from the fibre.s of the interior ; x 136. 



Figs, lb, Ic, Id. Cortical tylostyli ; x 272. 



Fig. le. Projecting tylostylus of basal edge ; x 60. 

 Fig. 8. — Sycon asjtennti (page 207). Twice the natural size. 



Fig. Hn. Triradiate spicule ; x 272. 



Fig. Hb. Quadriradiate spicule ; x 272. 



Fig. He. Oxeote spicule ; x 13(5. 



Pl.ATK III. 



Fig. 1. — Poli/tiniNfifi itKinniiilldris (page 198). Nat uial size. 



Fig. la. Tylostylus from the dermal layer of the cortex ; x 136. 



Fig. \b. Tylostylus from the inner layer of the cortex ; x 136. 



Fig. \c. Tylostylus froin the main fibres ; x 60. 



Fig. Id. Head of projecting t ylostylus ; x 136. 

 Fig. 2.— Tentorium semisuberifes (page 200). Natural size. 



Fig. 2a. Tylostylus from the main fibres ; x 60. 



Fig. 2b. Head of .same ; x 272. 



Fig. 2c. Tylostylus from the cortex of the top ; x 136. 

 Fig. li.—Cliona celata (page 204). Tylostjdus ; x 272. 

 Fig. ^.—Thenea muricafa (page 204). Natural size. 

 Fig. a.—LeucosoU'nia cant-ellata (page 2().ï). Triradiate spicule ; x 272, 



Fig. .>'<. Triradiate with incipient fourth ray ; x 272. 



Fig. hb. Quadriradiate spicule ; x 272. 



Figs, 5c, 5rf. Small quadriradiate spicules ; x 272. 



