184 OK BETOZOA FKOM TRANZ-JOSEF LANO 



Fig. 4. Horncra lichenoides, Jj. Section of pi'otoplasmic reticulum coutaining 

 ovarian masses, X 450. This reticulum is shown slightly magnified 

 in fig, 1. 



5. Do. Section of the wall of the ovicell, X 100. 



6. Do. Do., X 250. 



7. Alcyonidium gclatinosum, L. Ovarium showing three ova surrounded 



by the follicular walls, X 250. From Cape Mary Harmsworth, 53- 

 93 fathoms ; Aug. 8th, 1897. 



8. Alcyonidium sp. Younger end of the ovarium, X 250. From Naples. 



Tliis species corresponds in most particulars with A. gclatinosum, L. 



9. Do. Young ovarium attached to the ciecum, X 250. 

 10. Do. Ovarium in a distinct reticulum, X 85. 



Plate 21. 



Fig. 1. Biasiopora obelia, var. arctica, nov., X 25. Showing the adventitious 

 tubules and the ovicell. From | of a mile S.W. of Elmwood, 

 18 fathoms ; June 26th, 1897. 



2. Idinonca atlantica, Forbes. Natural size, 



3. Do. X 12. Showing the ovicell. From lat. 77° 55' N., long. 53° 16' 



E., 130 fathoms ; July 12th, 1897. 



4. Idmonea tumida, Smitt, X 12. From lat. 77° 55' N., long. 53° 16' E., 



130 fathoms ; July 13th, 1897. 



5. Do. Natural size. 



6. Alcyonidium gclatinosum, L. Section X 85, showing the cuticula {c), 



the cuticula folded inwards at the oral aperture {cf). The layer of 

 epithelial cells on the inside of the cuticula is shown as well as the 

 endoderm lining the walls of the zooecia. In the younger zooecia 

 divided off from the larger ones there are buds in various stages of 

 growth. From North Wilczek Land. 



7. Do. Section X 125, showing the cuticula folded to the inside of the 



colony. 



