PLATE IX. 



Culeolus murrayi, Herdman. 



Fig. 1. A transverse section through the peduncle of Culeolus murrayi; magnified 



(Hartn., obj. 4). 

 Fig. 2. Part of a longitudinal section through the same peduncle ; magnified (Hartn., obj. 4). 

 Fig. 3. One of the hollow papillae from the outer surface of the test ; magnified 



(Hartn., obj. 4). 

 Fig. 4. Blood corpuscles from the interior of a papilla ; much magnified (Hartn., obj. 7). 

 Fig. 5. Part of an internal longitudinal bar from the branchial sac ; much magnified 



(Hartn., obj. 5). 

 Fig. 6. A small portion of the last figure more magnified (Hartn., obj. 7). 

 Fig. 7. Calcareous spicules from the thin layer of mantle covering the viscera on the left 



side ; magnified (Hartn., obj. 4). 

 Fig. 8. Part of the same layer of mantle, more magnified, to show the epithelium 



(Hartn., obj. 7). 

 Fig. 9. The wall of the heart ; much magnified (Hartn., obj. 7). 

 Fig. 10. A few of the fusiform muscle-cells from the last figure ; more enlarged 



(Hartn., obj. 10). 

 Fig. 11. Part of the pericardial membrane, showing a spicule (sp.), and the polygonal 



epithelium ; much magnified (Hartn., obj. 7). 

 Fig. 12. One of the smaller tentacles, showing spicules, blood corpuscles, &c. ; magnified 



(Hartn., obj. 4). 

 Fig. 13. DetaUs of structure of a tentacle — 



a. The tip of a tentacle ; much enlarged (Hartn., obj. 5). 



b. and c. Parts of the epithelium of the surface of a tentacle ; much enlarged 



(Hartn., obj. 7). 



d. Surface view of the short columnar cells of the free (anterior) edge ; much 



magnified (Hartn., obj. 7). 



e. The same cells ; profile view. 



Fig. 14. Part of the dorsal lamina, showing the languets ; enlarged. 



Fig. 15. The neighbourhood of the nerve ganglion, showing also the dorsal tubercle 



(d.t.) ; slightly enlarged. 

 Fig. 16. The structure of the ova ; magnified. 



a. A mature ovum, showing the germinal vesicle (g.v.), and germinal spot (g.s.) 



(Hartn., obj. 7). 



b. A young ovum, with comparatively little \ltellus around the germinal 



vesicle (Hartn , obj. 7). 



c. The outer edge of the mature ovum, more enlarged, showing the capsule of 



cubical epithelium (Hartn., obj. 7). 

 Fig. 17. The structure of the testis — 



a. Clump of spermatic vesicles ; magnified (Hartn., obj. 4). 



b. The end of a vesicle ; more enlarged (Hartn., obj. 7). 



