38 ROYAL SOCIETY OF CANADA 
PLATE I. 
Fig. 1.—Gellius Laurentinus (page 20). Oxeote spicule ; X 272. 
Fig. 1a. Simple sigma ; X 272. 
Fig. 2.—Æsperella Fristedtii (page 21). Natural size. 
Hi TS VIUS ES ON 6° 
Fig. 2b. Anisochela, front view; x 272. a 
Fig. 2c. Anisochela, side view ; x 272. 
Figs. 2d, 2e. Tylostyli; x< 272. 
Fig. 2f. Stylus, from another specimen ; X 136. 
Fig. 29. Anisochela, front view ; x 272. 
Fig. 2h. Anisochela, side view ; x 272. 
Fig. 3.—EÆEsperella minuta (page 23). Twice the natural size. 
Fig. 3a. Large stylus; X 272. 
Fig. 3b. Small tylostylus ; X 272. 
Fig. 8c. Anisochela, front view; x 272. 
Fig. 4.—Sycon protectum (page 27). Natural size. 
Fig. 4a. Part of a horizontal section ; X 60. 
Figs. 4b, 4c. Gastral quadriradiate spicules; X 272. 
Fig. 4d. Tubar triradiate spicule ; X 272. 
Figs. 4e-h. Triradiates from near the dermal surface with bent basal 
rays; X 272. 
Fig. 4i. Large oxeote spicule from the distal end of a chamber; X60. 
Fig. 4j. Linear spicule; X 136. 

