MARINE SPONGKS OF BRITISH COLUMBIA, ETC. 77 



EXPLANATION OF PLATES. 



PLATE III. 



All the figures in this plate are of natural size. 



Fig. 1. — Halichondria panicM {pa,ge 73). Massive variety. 



Fig. 2. — Halichondria panicca (page TA). Encrusting form. 



Fig. 3. — Myxil/a lacwwsa (page 76). 



Fig. 4. — Esperiopsin rigida (page 74). 



Fig. 5. — Esperiopsin Vancouvtrensis (page 74). 



Fig. 6. — 3/i/mHo rosacea, var. (page 77). 



Fig. 7. — Suberiks latus, side view (page 77). 



Figs. 8, 9. — Esperiopsis Qiuxtsinoensis, side views of two specimens showing variations in form (page 75). 



Fig. 10. — E/periopgis laxa (pnue 76). 



PLATE IV. 



The ligures in this plate are of natural size, unless otherwise stated. 



Fig. 1. — Cudonium Mulleri (page 78). 



Fig. 2. — Bathydorus Daiosoni (page 79). One-half natural size. 



Fig. '■>. — Hulichondna pa7M'«a (page 81). Rugose form, one-half natural size. 



Fig. 4. — Halicliondria panicea {pa,ge 81). 



Fig. 5. — Halichondria panicea (page 81). One-half natural size. 



Eig. 6. — Reniera ruf encens (page 81). 



Fig. 7. — Esperiopsis Quatsinoensis (page 82). 



Fig. S.—Phal:cliia]}apyraeea,\a,r. (page 82). 



PLATE V. 



Fig. 1. — Halichondria panicea (psige 73). Small oxeote spicule ; x 272. 



Fig. la. Large oxeote spicule; x 272. 

 Fig. 2. — Halichondria panicea (page 73). Skeleton arrangement, as seen in section at right angles to the surface; 

 X 60. 



Fig. 2a. Small oxeote spicule ; x 272. 



Fig. 2b. Large oxeote spicule ; x 272. 

 Fig. '.)■ — Experiopsis rigida (puge 74). Skeleton arrangement, as seen in vertical section ; x 60. 



Figs, oa, 3b, 3c. Stout styli ; x 272. 



Fig. 3d. Slender stylus; x 272. 



Figs. 3e, 3f. IsocheUe, side view ; x 272. 



Fig. 3g. Isochela (undeveloped), side view; x 272. 

 Fig. i.—EspjerioiJsis Vanrouverensis (p&ge 74). Skeleton arrangement, as seen in vertical section at the surface- 

 X 60. 



Figs. 4a, 4b. Styli ; x 272. 



Fig. 4c. Isochela, side view ; x 272. 



Fig. 4d. Isochela front view ; x 272. 

 Fig. ô.—MyxiUa lacunosa (page 76). Vertical section showing the arrangement of the skeleton ; x GO. 



Fig. .5a. Stylus; x 272. 



Fig. 5b. Tornote spicule ; x 272. 



Fig. 5c. Isochela, front view ; x 272. 



Fig. 5d. Isochela, side view ; x 272. 



Figs. 5e, 5f, 5g. Sigmata; x 272. 

 Fig. 6.—Mijxilla rosacea, var. (page 77). Section to show the general arrangement of the skeleton; x 60. 



Fig. 6a. Spined stylus ; x 272. 



Fig. 6b. Tornote spicule ; x 272. 



Fig. 6c. Isochela, front view ; x 272. 



Fig. 6d. Isochela, side view ; x 272. 



Figs. 6e, 6f. Sigmata ; x 272. 

 Fig. 7.—Suberites latua (page 77). Large tylostylus from the body of the sponge ; x 136. 



Figs. 7a, 7b. Large tylostyli, showing portions of the spicules more highly magnified ; x 272. 



Fig. 7c. Small tylostykis from the cortex; x 272. 



