DEVELOPMENT OF THE OALIFORNIAN HAG-PISH. 279 



DESCRIPTION OF PLATE 17, 



Illustrating Dr. Bashford Deau's paper " On the Development 

 of the Californian Hag-fish, Bdellostoraa Stouti, 

 Lockington.^ 



3} 



Fig. 1. — Bdellostoma taken ou trawl-line, showing egg-string entangled in 



encasing slime. X |. 



Fig. 2.— Tips of horn-like filaments of eggs, x about 30. 



Figs. 3, 4, 5.— Stages of early embryos. X 4^. ab. Anterior end of 

 brain. AU. Auditory vesicle. B. Brain, bp. Blastopore. GS. 

 Gill-slits. H. Heart, n. Spinal cord. o. Rim of operculum, op. 

 Optic vesicle, pn. Pronephric tubules. PS. Somites. UDT. Un- 

 differentiated tail mass. * Appearance of mesoblast. 



Figs. 6, 7, 8.— Two stages of late embryos. X 4^. a. Anus. au. Audi- 

 tory vesicle. da. Dorsal aorta. gs. Gill. sacs. H. Heart, m. 

 Mucous pouch. OP. Eye. n. Nasal sac. pn. Pronephric tubule. 

 SD. Pronephric duct. 



