ASCIDIAXS COLLECTED IN PUGET SOUND. £53 



form, with the wider end posterior, and attached by a 

 small process in the middle of the posterior end. Aper- 

 tures both near the anterior end, not far apart, both 

 distinctly lobed. Surface very smooth and -listening. 

 Colour clear glassy grey. Length 5 cm., breadth I cm., 

 thickness, 2 cm. 



Test moderately thick, gelatinous, semi-transparent, 

 the alimentary canal showing through. 



Mantle very thin, with scarcely any musculature visible 

 except at the anterior end just around the bases of the 

 siphons. 



Branchial sac large, very thm and delicate. Internal 

 longitudinal bars numerous and very wide. Their internal 

 edges thickened, especially opposite the connecting ducts, 

 but no papillae present. Transverse vessels narrow and 

 not distinctly marked. The stigmata form rather irre- 

 gular spirals of different sizes and shapes. 



Many red pigmented cells are scattered throughout 

 both mantle and branchial sac. 



Dorsal lamina formino- a series of triangular banquets. 



Tentacles long and tapering, 28 in number, with the 

 same number of much smaller ones alternating with the 

 larger. 



Dorsal tubercle straight, transversely elongated, not 

 curved. Slit irregular, approaching a crescentic form. 



Visceral mass large, but only occupying the posterior 

 one-third of the left side. 



Locality: Port Townsend, 3 specimens. 



This handsome Corella (PI. XL, fig. 1) appears to be 

 new. It was of a bright crystalline appearance flecked with 

 red pigment when alive. From Corella larrctformis and 

 C. ovata, it differs in shape; from C. minuta and C. 

 novarcdj in the number of tentacles; from C. eumyota 



