CONVOLUTA HOJSCOFFENSIS, GRAFF. 10^ 



EXPLANATION OF PLATE XIII, 



Illustrating Dr. Ernest Warren's "Note on Convoluta 

 roscoffensis Graff; collected on the Natal Coast." 



Fig. 1. — X 100. Young specimen resembling a planula. 



Fig. 2. — x 100. Somewhat older specimen, showing the formation 

 of the oral vestibule (o. v.), and the germinal cells (g. c). Some ingested 

 diatoms can be seen (/.). 



Fig. 3. — x 100. Anterior portion of an individual nearly mature. 

 b. Brain, b. s. Bursa seminalis. di. Chitinous tiibe. cli. b. Chloro- 

 phyll l;>odies. d. o. Developing ova in a remarkably branched condition. 

 e. Eye. /. Food. /. o. Frontal organ, g. c. Germinal cells, m. Mouth, 

 o. Otocyst or statocyst. o. v. Oral vestilmle. t. Testes. $ a. Female 

 aperture. 



Fig. 4. — x o.50. Chitinous tulje of Inirsa seminalis. 



Fig. 5. — x 200. Horizontal section through the anterior end, show- 

 ing : /. 0. Frontal organ, o. v. Oral vestiljule. with its scattered shoi-t 

 cilia (c. v.). g. c. Germinal cells, ch. b. Chlorophyll bodies, c. b. Cilia 

 forming a compact layer on the general surface of the body. 



