W. G. Van Name — Bermuda Ascidians. 411 



Figure 149. — Stijela partita (Stimpson). Part of the branchial sac of the speci- 

 men shown in figure 147, more highly magnified. Page 889. 



Figure 150. — Halocynthia ruhrilahia Verrill. Animal removed from the test, 

 seen from the left side. Showing the muscle bands of the mantle, x 

 about \yi. Page 393. 



Figure 151. — Polycai'pa obtecta Traustedt. Small piece of the branchial sac 

 (showing two internal longitudinal bars) from one of the spaces between 

 two folds near the middle of the sac. x 30. Page 386. 



Figiire 153. — Halocynthia ruhritabia Verrill. Specimen cut transversely. 

 Slightly enlarged. Page 393. 



Figure 153. — Polycarpa obtecta Traustedt. Small piece of the mantle showing 

 longitudinal, transverse and oblique muscle bands, x about 30. Page 386. 



