W. G. Van Name — Berimida Ascidians. 837 



Family PEROPHORID^ Giaid. 



Distiiiguisliecl from the Clavelinidw chiefl}^ by the absence of an 

 abdomen. 



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

 plain or with papillte 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), Wlegm., 1835. 



Bod}' short and wide, the branchial sac with but four rows of 

 long, narrow stigmata. Both apertures lobed. 



Branchial sac Avith papilhv (which are often branched) on the 

 transverse vessels, but no internal longitudinal bars. Dorsal lamina 

 with languets. 



Perophora viridis Veiiill. 



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

 1871 ; also Eep. 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 Pf.rophora, Jour, of Morphology, 1898. 



Plate XLVII. Figure 8. 



" Colonies composed of nearly sessile individuals about 2.5™"^ to 

 3mm high, connected by slender stolons, and thickly covering the 

 surfaces over which the}^ creep. Test compressed; seen from the 

 side, seai'cely 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 10 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 usuall}^ 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 Avere all small, with but few individ- 

 uals, and these were lighter colored and rather more transparent 



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



