260 NEW-YORK FAUNA — MOLLUSCA. 



GENUS BOLTENIA. Savigny. 



Envelope coriaceous : body dilated, and attached by a leng footstalk. Branchial and intesti- 

 nal orifices each quadrifid : branchial sac plaited longitudinally, surmounted by a circle of 

 compound tentacular threads ; tlie meshes of the respiratory tissue without papilte. Ab- 

 domen lateral ; liver none. 



BoLTENIA RENIFORMIS. 



PLATE XXXIV. FIG. 324. 



(STATE COLLECTION.) 



Atcidia clavata ? MnLLEK, Prod. Zool. Danica, 2740. 



A. globifcra. Sabine, App. Parry's Voyage, No. 10. 



BoUenia reni/armis. MACLE.tY, Lin. Tr. Lend. Vol. 14, p. 536, pi. 18. 



Description. Sac oblong-oval, 2' 5 in length and about 1 '5 in diameter, tapering gradually 

 into a cylindrical tube ; it is of a leathery texture, corrugated longitudinally, and covered (as 

 well as the tube) with Tubularia, Flustra, and other polypes. The tube is about the size of a 

 large goosequill, five or six inches in length, and transversely corrugated. The specimen was 

 too much injured to enable me to observe the branchial and intestinal orifices. 



Color, of the tube, yellowish ; of the sac, reddish externally ; the membrane lining the 

 interior, of a shining salmon-color. 



This species was obtained by Mr. George Gibbes, by dredging in the harbor of New-York, 

 and presented to the State Collection. It was firmly attached to a valve of the Modiola 

 papuana. 



