CLASSIFICATIOIS' OF THE TUNICATA. 587, 



Subfamily CoheIj-lii^m, Serdinan, 1882. 



Bodi/ attached, sessile or pedunculated. Branchial aperture, 

 with 8, 6, or no lobes. 



Test cartilaginous, gelatinous or horny. 



Branchial sac provided with internal longitudinal bars. Stig- 

 mata curved. 



Alimentary canal usually on right side or dorsal edge of 

 branchial sac. 



This subfamily contains 3 genera which may be separated as 



follows : — 



f Test modified to form horny (chitinaceous) plates ... Chelyosoxna. 

 \Test soft and gelatinous or cartilaginous 1 



{Body sessile ; 'viscera on right side of branchial sac Corella. 

 Body pedunculated ; viscera on dorsal edge of branchial sac. 

 Corynascidia. 



CnELYOSoiiA, Brod. 4' Soio., 1829. 



Bod;i/ flattened antero-posteriorly, depressed and attached. 

 Branchial and atrial apertures both 6-lobed. 



Test modified on the upper surface to form polygonal horny 

 plates, definite in shape and position. 



Branchial sac with curved stigmata. 



Dorsal lamina represented by languets. 



Alimentary canal on left side of branchial sac. 



Gonads forming a network over the intestinal loop. 



There are two known species : — 



With the test of the upper surface divided into 8 plates. 



C. Macleayanum, Brod. & Sow. (Atl., Arct., Pac.) 

 With tlie test of the upper surface divided into 14 plates. 



C. prodactum, Stimps. (N. Pac.) 



CoETKASCiDiA, Herdman, 1882. 



Body elongated, pyriform, pedunculated. Apertures not 

 lobed. 



Test gelatinous or membranous. 



Branchial sac extremely delicate. Internal longitudinal bars 

 present, but not provided with papillae. Interstigmatic vessels 

 and stigmata coiled spirally. 



Dorsal lamina represented by languets. 



Tentacles simple, filiform. 



Alimentary canal on dorsal edge of branchail sac, running 

 antero-posteriorly. 



Gonads ioxmrag a mass placed on the posterior end of stomach. 



