Vol. IX. September, ryoj. No. ./ 



BIOLOGICAL BULLETIN 



THE ANATOMY OF THE EYES AND NEURAL. 

 GLANDS IN THE AGGREGATED FORMS OF 

 CYCLOSALPA DOLICHOSOMA-VIRGULA 

 AND SALPA PUNCTATA. l 



MAYNAKI) M. METCALF AND MARY E. G. I.ENTZ JOHNSON, M.A. 

 (WITH PLATES VII., VIII. AND IX.) 



The eyes of the solitary salpas of the several species show 

 but little diversity. All are in the form of a horseshoe above 

 the ganglion, the ends of the horseshoe pointing forward. In 

 la sis cordiformis- zonaria the ends of the horseshoe diverge, 

 pointing outward and upward at an angle of about 45. In 

 Salpa runcinata-fusifonnis there are masses of somewhat irregu- 

 lar rod-cells in the dorsal part of the ganglion, in front of the 

 eye. With these exceptions the differences in the eyes of the 

 solitary forms of the different species are too minute for verbal 

 description. 



In the aggregated forms, on the other hand, the diversity be- 

 tween the eyes is very great. Each species has its own charac- 

 teristic and distinctive form of eye and the histological differences 



'This study of the eyes and neural glands of two species of SalpiJic was accepted: 

 in June, 1903, by the Woman's College of Baltimore, in partial discharge of the re- 

 quirements for the degree Master of Arts at that time conferred upon Miss Mary E. 

 G. Lentz. Its publication has been delayed until I could receive and study addi- 

 tional material of these and other species of Salpa in the hope of getting conclusive 

 evidence upon disputed points of innervation. I obtained from Naples material of 

 three species of Salpa preserved some in half strength glycerine and some in chloral 

 hydrate, and endeavored to study the innervation of the eye by the use of dissoci- 

 ation media, especially Haller's acetic acid mixture, but the results obtained are not 

 sufficiently conclusive to warrant publication. 



MAYNARD M. METCALF, 

 Professor of Biology, The I Toman' s College of Baltini re. 



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