CLASSIFICATION OF THK TUNICATA. 627 



Sranchial sac v\ith no iuternal longitudinal bars. 



Tentacles simple, 12, o£ two sizes placed alternately. 



Alimentary canal not twisted. Stomach- wall longitudinally 

 folded. 



Fostahdo7nen long, separated off from abdomen by a slight 

 constriction. 



There are two species of JFragarium : — 



f Colour rose-red, branchial siphon white F. ehgans, Giard. (N.W. Enr.) 



\ Colour yellow-red, branchial siphon colourless. F. areolatum, D. Oh. (Med.) 



Feagaeoides *, Maurice, 1888. 



Colony rounded, massive, of cartilaginous consistency, having 

 numerous compound S3'stems. External cloacal apertures few. 



Ascidiozooids with 8 branchial lobes. Atrial aperture not 

 lobed, but with a moderately large atrial languet. Thorax larger 

 than abdomen. Postabdomen very long, not pedunculated. 



Branchial sac large, with about a dozen rows of stigmata. 



Dorsal languets wide. 



Tentacles 14, 6 large and 6 small alternately, and 2 additional, 

 very small, placed one at each side of the base of the large medio- 

 dorsal tentacle. 



Stomach with longitudinal folds. 



Postahdomen not separated from abdomen by any constriction. 



This contains the single species Fragaroides aurantiacum, 

 Maurice, from Yillefranche-sur-Mer (Med.). 



ClECiNALiUM, Giard,, 1872. 



Colony polymorphic, sessile. 

 Systems absent or simple. 



Ascidiozooids with thorax, abdomen, and postabdomen. Bran- 

 chial aperture 8-lobed, atrial anterior. 



Branchial sac moderately large, no internal longitudinal bars. 



StomacTi-ivall folded. 



Postahdomen very long. 



This contains the species CircinaUum concrescens t, Giard, 



* This subgenus is most closely related to Fragarmm, and probably ought to 

 be united with it. 



t According to Lahille, this is the Sidnyum turbinatum of Savigny and 

 of Forbes. 



