PLATE XXVI. 



Figs. 1—7. Rhabdocalyptus arcticus nov. sp., p. 477. 

 Fig. 1. Gastral membrane with hexacts. x 90. 



— 2. Oxyhexacts. x 90. 



— 3. Oxypentacts from dermal membrane, x 225. 



— 4. Tangential ray of prostalia pleuralia. x 50. 

 Figs. 5— 5 c. Oxydiacts. fig. 5 x 130; figs. 5a-c x 345. 



-- 6— 6 b. Diact. fig. 6 X 50; figs. 6 a— b x 345. 



— 7— 7 a. Hexacts. x 405. 



Fig. 8. Halichondria teimispiculata nov. spec. pag. 479. 



Figs. 8 a— d. Oxea, grown up and developmental forms, x 345. 

 Figs. 9—10. Higginsia pgriformis nov. spec. pag. 481. 



Figs. 9— 9 b. Tylostyles. fig. 9 x 130; fig. 9 a— b. x 405. 



Fig. 10. Minute oxea. x 900. 



