542 Mr. W. S. Mac le ay's Anatomical Observations 



Tentacula about ten or twelve, compound and laciniated like 

 those of the genus Boltenia. 



Branchial pouch having its net- work exceedingly lax, meshes irre- 

 gular and indistinct, but apparently simple, the nervures 

 being nearly of the same size. The longitudinal folds of 

 the branchiae, or rather (owing to the singular position of 

 them in this genus) their transverse folds, about fourteen or 

 fifteen in number. 



Length of body half an inch. 



I have named this new species after the gentleman to whom I 

 owe my acquaintance with its structure, and who appears to 

 have found only this one specimen of it during the late voyage. 

 And I shall now enter into the discussion of its anatomy with as 

 much detail as the possession of only one specimen will enable 

 me to do. 



The body of this animal, so different in many respects from 

 all other Tetht/a, is pyriform, and attached to a pedicle so short 

 as scarcely to curve down further than the branchial orifice. 

 This pedicle is rather conical at its base, sub-cylindrical and 

 apparently very weak at its extremity. From this apparent 

 weakness and imperfect formation of the pedicle, in conjunction 

 with the circumstance of one side of the conical part in the only 

 specimen that I have seen being encrusted with sand, I suspect 

 that the animal can scarcely be said to be suspended by its pedi- 

 cle, but rather reposes on the conical part of it ; by which means 

 the folds of the branchial pouch will take a vertical and the sto- 

 mach a horizontal position, and thus be more in correspondence 

 with the ordinary position of the stomach in simple Ascidice, 

 which is very rarely descending. 



The envelope of Cystingia Griffithsii is exceedingly smooth, 

 and so pellucid as to appear almost gelatinous. The original 



colour 



