536 Mr. W.S. Maczeay’s Anatomical Observations 
Ascidia clavata. Shaw, Zool. Miscell. vol. v. tab. 154. 
Vorticella Bolteni. Linn Mantiss. Plant. app. p. 552. 
Zoophytorum genus novum. Fred. Bolten, Epist. Hamb.1770. cum 
tabulá. 
Spec. 3. BoLTENIA RENIFORMIS. 
B. obscura scabriuscula, corpore subreniformi, orificiis sub-pro- 
minentibus, pedunculo terminali. 
Ascidia globifera. Capt. Sabine in App. no. x. to Parry's Voyage 
to Melville Island. 
clavata. Otho Fab. Faun. Groen. no.323. Müller, Zool. 
Dan. Prod. 2740. (secundum Fabricium, sed descriptio apud 
Miillerum nimis est indefinita et omnibus his speciebus 
idonea.) 
Inhabits the northern. seas of America. 
Descr. Envelope sub-pellucid, whitish. Mantle or tunic very 
thin, provided with transverse circular narrow muscles, 
which cut each other very obliquely. 
Tentacula about ten or twelve in number, very unequal, clavate, 
with the clava plumiform or beautifully divided into a num- 
ber of regular laciniz. 
Branchial pouch marked with about fifteen or sixteen large folds, 
and having the net-work simple and regular as in the Cyn- 
thia momus of Savigny. 
Dorsal sulcus having the two lateral filaments winged and the 
intermediate diste: 
Œsophagus descending vertically to the lower end of the body, as 
suspended, and there meeting an ascending ovoidal sto- 
mach without any apparent internal folioli. 
Intestine with an oblong longitudinal open loop, which is pro- 
longed to the pedicle. Rectum narrow and sub-conical, and 
ascending nearly parallel to the cesophagus, ee higher. 
Anus having a scolloped margin. 
Liver 
