212 A. E. Verrill on Ascidians from New England. 



form circular or elliptical groups, of from five to sixteen or 

 more, surrounding circular or elliptical cloacal openings. Tk 

 '' marginal tubes " are numerous in all parts of the common 

 tissue, tlie enlarged ends appearing as oval or pyriform spots 

 lighter than the ground color. The branchial openings are 



ing is usually considerably more distant from the brancMal than 

 in figure 15, and its tube much larger and more divergent 

 The outer end or branchial side of the body usually projects 

 considerably beyond the branchial opening, as in figure lb. 

 The form of the stomach also differs, and in preserved speci- 

 mens it is difficult to determine its normal form. Its surface i? 

 finely corrugated or iiTegularly ribbed, with a glandular struc- 

 ture, which is finely granulated. . , 



The colors of the specimens were not very carefully examined 

 during life, but the common tissue is gi-eenish-gray and tue 

 animals purplish, with a lighter central spot. When presen-ea 

 m alcohol the tunic is finely speckled with deep purple, toe 

 stomach and ovaries are light yellow. The branchial sac na^ 

 eight or nine transverse purple vessels, and six or more longi- 

 tudinal ones that are of the same size and color, with smaller_ 

 nearly uncolored ones between (figs. 16, 18). The stigmata ar 

 narrow eUiptical or oblong (fig. 17). Seen externally the branch- 

 ial orifice is surrounded by a white spot, and another light sp- 

 IS situated at the anal opening near the inner end. The ©' 

 gmal tubes are dull yellow with the enlarged ends often opaq 

 white. g 



Brooklyn, Long I.,— D. C. Eaton ; Charlestown, Mass.,— J- 

 Sanborn ; Salem,— E. S. Morse. , „,?., 



This species appears to be more nearly allied to B. poW. 

 of Northern Europe than to B. Schhsseri, but is apparen^l 

 quite different from both. 



Figure 18.-Another individual, seen from the left side, and enlarged 10 ^^^ 

 t rs: a, anal tube; e, atf.mach; L ventral duct of the brauchial sac; 0, leii 



lintlv developed ; the branchial i 

 t spot surrounded by a faint cir 

 Some of the [.urpie pigment d 



