A. E. Verrill — Tunicata and MoUuscoidea of the Bernnidas. 589 



Styela canopoides Heller. Traust. 



Similar to S. partita externally. Tunic salmon-color with very- 

 fine muscle-bands; oral siphon very short, scarcely prominent; atrial 

 siphon short conical, not far back (distance \ whole length of tunic). 

 Tentacles numerous, simple, very slender. Gonads in two groups 

 on each side, pyriform, each group attached along the sides of a 

 slender sinuous duct. 



Halocynthia rubrilabia, sp. nov. Fig. 7. 



Body rather large, swollen, oblong or oblong-ovate, usually longer 

 than high, broadly attached, with the tubes wide apart, large, and 

 moderately elongated in extension, nearly equal, or the oral a little 

 longer. 



Test thick, firm, more or less wrinkled, when large usually covered 

 with extraneous matters through which the reddish color often 

 shows but faintly. 



Apertures similar, rather large, both 4-angled with 6-8 small 

 lobules in each angle ; when large roughly nodulose or warty. 



Tunic very muscular, the muscular bands strong, forming a very 

 distinct network; about 30 longitudinal bands on each side. 



Branchial sac has six broad plications on each side ; usually 4 or 5 

 large stigmata to each mesh. Dorsal lamina is represented by series 

 of small languettes. Tentacles about 

 20, of several diverse sizes ; the 12 

 largest ones are thick, tapered, acute, 

 with 16 to 20 small, simple pinnae on 

 each side (fig. 7; c). Ciliated organ 

 U-shaped, with both ends curved 

 one way. Siphons red ; apertures 

 four-lobed, the sinuses rounded (fig. 

 7; a). 



The anus has a crenulated margin 

 with about 12 unequal lobes, (fig. 

 7, ic; h). Intestine forms a broad 

 loop ; liver is large, glomerate, green- 

 ish. 



Gonads, in the adult, consist of 10-12 rather large glomerate 

 lobules in two curved rows on each side, but so crowded that their 

 serial arrangement is not very obvious ; those of the left side lie 

 mostly within the bend of the intestine. In younger examples they 

 appear as separate, small, rounded, brown masses, arranged pretty 

 regularly in two curved rows of 10-12 each, attached to the tunic. 



Figure 7. — Halocynthia rubrilabia, 

 left side ; b, branchial siphon ; c, 

 atrial siphon, ; e, oesophagus ; s, 

 stomach ; /, intestine ; x, anus; I, 

 liver; g, gonads, a, Oral aperture. 

 b, Anal papillae, c, A tentacle, 

 much enlarged. 



