24 ASCIDIIDiE. • 



Ascidia psammophora. 



Plate XXIV. Figs. 330, 331. 

 Ascidia psammophora, Agassiz, Proc. Am. Ass. Adv. Sc. ii. 159 (1850). 



Whose body is surrounded all over with fine sand. Found 

 around Cape Cod. (Ag-assh.') 



The figure copied from Mr. Burkhardt's drawing of the original 

 specimens will fix this peculiar species. It is readily distinguished 

 by its triangular shape. The orifices are widely separated, — the 

 branchial at the upper extremity on a long, stout tube ; the anal 

 at the lower right-hand corner of the triangle, much more sessile 

 than the branchial. When the sand is washed off the body, the 

 viscera show through, and the animal is of a rust color. 



Ascidia ocellata. 



Plate XXIV. Fig. 3.32. 

 Ascidia ocellata, Agassiz, Proc. Am. Ass. Adv. Sc. ii. 159 (1850). 



A beautiful tubular species, almost transparent, having a circle 

 of red dots (eyes) around the openings. From New Bedford. 

 {Ag-assiz.^ 



Mr. Burkhardt's beautiful drawing of the original specimen 

 serves to fix this species beyond a doubt. It is probably identical 

 with the more recently described A. tenclla. 



Ascidia tenella. 



Ascidia tenella, Stimpson, Proc. Post. Soc. N. II. iv. 228 (1852); Check Lists, 2 (1860). 



Body ol)long, somewhat elongated, flaccid, adhering by the base. 

 Test or outer tunic soft, gelatinous, slightly wrinkled, transparent, 

 showing beneath the folds of the branchial sac. Inner tunic pale 

 yellowish. Orifices terminal, approximated, on short tubes, the 

 branchial largest, with seven or eight lol)es and the same number 

 of red ocelli. The anal has six lobes and six red ocelli, which are 

 much l)righter colored than those of the l^ranchial orifice. Length 

 about one inch, breadth one third of an inch. 



This species was dredged at the depth of thirty-five fathoms 

 on a shelly bottom near Great Duck Island, Grand Manan. It 

 adheres to fragments of shells and often to other Ascidians. It 



