DEVELOPMENT OF THE HEAD IN GOBIUS CAPITO. 335 



Observations on the Development of tlie Head 

 in Gobius capito. 



By 



H. B. Pollard, 



Oxford. 



With Plates 21 and 22. 



Introduction. 



When attempting to pursue some studies on the Compara- 

 tive Anatomy of the head in Teleostei, I became aware that it 

 would be desirable to understand the development of some 

 form. Gobius capito showed itself to be the most suitable, 

 and therefore in this species I have investigated and described 

 stages of development of the brain, mouth, and mesodermal 

 structures. The work has been carried out during occupation 

 of the Oxford table at the Naples Zoological Station. 



My grateful acknowledgments are due to the University of 

 Oxford and to my college, Christchurch, for funds, and to the 

 members of the staff of the Naples Station for their constant 

 kindness, extending frequently to questions other than those 

 of material and reagents. 



Material and Technique. 



Gobius capito lays its eggs in the month of March at 

 Naples, at which time they can be brought in in unlimited 

 quantities by the fishermen. The embryos are enclosed in a 

 tough shell, spindle-shaped, with pointed ends somewhat like 

 a grain of barley. The eggs are 4 — 5 mm. long, yellowish in 

 colour, and are regularly affixed to rocks and bits of pottery, 



VOL. 35, PABT 3. — NEW SER. A A 



