536 Mr. W. S. Macleay's Anatomical Observations 



Ascidia clavata. Shaw, Zool. Miscell. vol. v. tab. 154. 

 Vorticella Bolteni. Lmn Mantiss. Plant, app. p. 552. 

 Zoophytorum genus novum. Fred. Bolten, Epist. Hamb. 1770. cum 

 tabuld. 



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. Miiller, Zool. 



Dan. Prod. 2T 40. (secundum Fabricium, sed descriptio apud 



Mullerum 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 laciniae. 



Branchial pouch marked with about fifteen or sixteen large folds, 

 and having the net-work simple and regular as in the Cyn- 

 thia mom us of Savigny. 



Dorsal sidcus having the two lateral. filaments winged and the 

 intermediate simple. 



(Esophagus 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 oesophagus, only higher. 

 Arms having a scolloped margin. 



Liver 



