28:2 ANATOMY AND PHTSIOLOGY 



TlQ. 



336. A reticulated ovarium in situ, on the fragment of a 



sponge from Madeira. X 108 linear. Page 

 144. 



337. A portion of the reticulated structure from an ovarium 



of the same description as represented by Fig. 336. 

 X 308 linear. Page 144. 



338. An ovum in course of development into a young 



sponge on the same membrane as that on which 

 the ovarium represented by Fig. 336 is seated. 

 X 108 linear. Page 144. 



339. A group of ova or gemmules in course of develop- 



ment into young sponges, found, with many others, 

 on the inner surface of a fragment of a large Pecten 

 from Shetland. X 108 hnear. Page 146. 



340. A small portion of the skeleton of Iphiteon panicea 



in the Museum of the Jardin des Plantes, Paris, with 

 gemmules in situ. X 183 {Dadylocalix, Stutch- 

 bury). Pages 146 and 204. 



341. A gemmule detached ^ova. Iphiteon panicea. X 660 



linear. Page 204. 



342. A gemmule extruded from near the base of a speci- 



men of TetJda lyncurium, on the distal extremity 

 of one of the skeleton fasciculi. X 50 linear. 

 Page 149. 



343. Part of a group of internal gemmules in situ, on tlie 



interstitial membranes of Tethea cranium : — a, one 

 of the larger and most completely organized gem- 

 mules ; b, one of the smaller and more simple 

 gemmules which always accompany the larger ones. 

 In Canada balsam. X 108 linear. Page 148. 



344. One of the larger description of gemmules of Tethea 



cranium, in its natural state, removed from the 

 membrane and viewed by direct light. X 25 

 linear. Page 148. 



