W. G. Van Name — Bermuda Ascidians. 337 



Family PEROPHORIDJE Giard. 



Distinguished from the Clavelinidse chiefly by the absence of an 

 abdomen. 



Branchial sac with from four to many rows of stigmata, either 

 plain or with papillae or longitudinal bars. The dorsal lamina may 

 be a continuous membrane, but languets are usually present. 



The stomach and intestine lie on the left side of the branchial sac. 



Reproductive organs in the intestinal loop. 



Genus Perophora (Lister, 1834), Wiegm., 1835. 



Body short and wide, the branchial sac with but four rows of 

 long, narrow stigmata. Both apertures lobed. 



Branchial sac with papillae (which are often branched) on the 

 transverse vessels, but no internal longitudinal bars. Dorsal lamina 

 with lansfuets. 



j &" 



Perophora viridis Verrill. 



Perophora viridis Verrill, American Jour. Science, ser. iii, vol. ii, p. 359, 

 1871 ; also Rep. of Comm. Fish and Fisheries, (Invertebrate animals of 

 Vineyard Sound, etc.), p. 702, 1871-72 ; also Webster's International Dic- 

 tionary, pp. 1365, 2004 (figures). 



See also Lefevre, Budding in Perophora, Jour, of Morphology, 1898. 



Plate XLVII. Figure 8. 



"Colonies composed of nearly sessile individuals about 2.5 mm to 

 omm high, connected by slender stolons, and thickly covering the 

 surfaces over which they creep. Test compressed ; seen from the 

 side, scarcely higher than broad, oval, elliptical or sub-circular, often 

 one sided or distorted, with a short pedicle or subsessile at base. 

 Branchial orifice large, terminal ; anal lateral or subterminal, both a 

 little prominent, with about 16 angular lobes, alternately larger and 

 smaller. Test transparent ; mantle beautifully reticulated with 

 bright yellowish green ; intestine yellow." (Verrill.) 



There are a dozen or more tentacles of two sizes placed alternately. 

 The horizontal bars of the branchial sac bear one papilla for every 

 two stigmata except near the ends. Testis usually consisting of 

 several separate glands. 



Specimens of Perophora from Bermuda do not appear to differ in 

 internal structure from this well known species of the New England 

 coast. The colonies collected were all small, with but few individ- 

 uals, and these were lighter colored and rather more transparent 



Trans. Conn. Acad., Vol. XI. 22 February, 1902. 



