STYELA OJBSCUEA. 1 19 



12. Styela obscura sp. nov. 



(PI. XXXVII, fig. 13 (?) *; PL XL VIII, fig. 15; and 



figs. 67-09 in text.) 



Body sub-cylindrical or sub-conical, attached by the 

 base, and coated with a thin but close envelope of fine 

 sand. Apertures tubular and prominent, coated with 

 sand the same as the body; the branchial terminal, 

 rather broad, quadrate, and wide, margined with red ; 

 the atrial about one third down, on a strong tube, 

 rather narrower than the other, and rising upwards. 

 Test (PI. XXXVII, fig. 13) nearly colourless, without 

 filaments, the sand adhering closely to the surface. 

 Reproductive onjtnis scattered over the inner surface of 

 the mantle. 



Length about three-quarters of an inch. 



Hab. ? 



CHANNEL ISLANDS. --Guernsey; dredged (Jeffreys 

 Norman). 



First record. Alder & Hancock ; coll. Jeffreys & 

 Xormaii, 1805. 



FIG. 68. Plo> 69- 



o- 



\ 



b.d. 



FIG. 68. Digestive organs of Styela obscura. Magnified. FIG. 69. Anal 

 aperture of the same. More highly magnified, b.d. Biliary duct. 



This species has some resemblance to Styela liumilis, 

 but differs from it in the position of the atrial aperture, 

 as well as in the filaments. From 8. comata it differs 

 in the latter character, also in being attached, and in 



[* There may be some doubt as to this figure representing Styela obscura. 

 It agrees with the description except in coloiir, perhaps diie to sand.] 



