IQ6 METCALF AND JOHNSON. 



are great. In addition to the large dorsal eye some species have 

 smaller eyes in the ganglion, and the number, position and char- 

 acter of these smaller eyes vary with the species. It is, there- 

 fore, important that we have recorded descriptions of the anatomy 

 of the eyes in the chain individuals of all species. Especially is 

 this true since suggestions as to relationship, so readily received 

 from the study of the eyes, appear to be trustworthy. 



The neural glands of the chain forms of different species may 

 also be very diverse, making it desirable to have descriptions of 

 their anatomy in all species. 



In the present paper the anatomy of the eyes and of the neu- 

 ral glands will be described for the chain forms of two species 

 whose eyes have not before been studied Clycosalpn do'icliosouia- 

 I'irgula and Sal pa pit net a ta. 



The other salpas the anatomy of whose eyes has been studied 

 are : 



Cyclosalpa pinnata, solitary and chain forms (by Goppert and 

 Metcalf). 



C. c/iainissonis, chain form (by Metcalf). 



Salpa afric ana-maxim a, solitary and chain forms (by Goppert 

 and Metcalf). 



6". runcinatfr-fusiformis, solitary and chain forms (by Goppert 

 and Metcalf). 



.S. crlindrica, solitary and chain forms (by Metcalf). 



lasis hc.vagona, solitary and chain forms (by Metcalf). 



/. costata-tiicsii, solitary and chain forms (by Metcalf). 



/. cordiformis-sonaria, solitary and chain forms (by Metcalf). 



Pegea scntigcra-confcderata, solitary and chain forms (by Gop- 

 pert and Metcalf). 



P. scutigera-confederata var. bicandata, chain form (by Met- 

 calf). 



Thalia democratica-mucronata, solitary and chain forms (by 

 Goppert and Metcalf). 



The anatomy of the neural glands has been described by Met- 

 calf for the chain and solitary forms of the species mentioned in 

 the foregoing list, except that the gland has not been described 

 for the solitary Pcgca scutigera-confederata var. bicaudata. It is 

 probable that bicandata is a variety of the chain form only and 

 that its solitary form resembles that of scutigera-confederata. 



