549 Mr. W.S. Maczeav’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 branchiæ, 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 Tethye, 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 Ascidie, 
which is very rarely descending. 
The envelope of Cystingia Griffithsii is exceedingly smooth, 
and so pellucid as to appear almost gelatinous. ‘The original 
colour 
