STYELA COM ATA. 121 



giving the test a peculiar appearance when the sand is 

 removed. 



This species was at first referred to the Ascidia 

 ampulla of Bruguiere, the Ascidium of Baster; but a 

 more attentive study of its characters, and a reference 



v.d. 



FIG. 70. An ovary of Styela comata. Magnified, od. Oviduct, v.d. 



Vas deferens. 



to the original description and figures of Baster, induce 

 us to consider it distinct. His Ascidium is described as 

 thickly covered with minute hairs curved at the points, 

 and as having the tubes granulated or shagreened, in 

 neither of which characters does the present species 



FIG. 71. FIG. 1-2. 





FIG. 71. Anal aperture of Styela comata. Magnified. FIG. 72. Anal 

 aperture of Styela vestita. Magnified. 



agree with it, nor does Baster's species appear to have 

 been coated with sand. 



This and the following species belong to the G-lauJitln 

 of Stimpson,* a genus divided from Cynthia, on account 



* ' Proc. Boston Soc. Nat. Hist.' [IV (1852), p. 230]. 



