SOME PUGET SOUND ASCIDIANS. 597 



Cynthia macrosiphonus n. sp. 



(PI. XX., Fig. 4 and PI. XIX., Fig. 24.) 



General Appearance : Whole animal, including siphons, 

 10.4 cm. long : exclusive of siphons 4.5 cm. : greatest diameter 

 2.7 cm. Siphons very long, the branchial nearly one and a half 

 times as long as, and the atrial a little longer than the body. Both 

 siphons four-lobed. Body attached on the left side near the 

 posterior end by a broad base. Color a muddy brown shading 

 in places to a yellowish brown ; siphons lighter colored. 



Test : In the posterior part, thick, coriaceous, prolonged into 

 short processes at the point of attachment, thinner toward the 

 anterior part. Dark over the body and over the lower part of 

 the siphons ; lighter, translucent and veiy smooth over nearly 

 the whole of the branchial and the anterior half of the atrial 

 siphon. Test on the anterior part of the body crumpled and 

 irregularly wrinkled, that over the lower part of the siphons with 

 deep transverse folds. An inner layer of test present, separating 

 readily from the outer test and from the mantle. This inner 

 layer soft, transparent, containing fibres and test cells ; inner sur- 

 face of outer test smooth, soft and shining. 



Mantle : Thin ; musculature well developed ; dorsal muscle 

 large ; circular muscle bands at the base of the siphons, and both 

 longitudinal and circular muscles of the siphons very strong. 



Branchial Sac : Six folds on each side, about fourteen bars 

 on a fold, and seven or eight between them ; meshes oblong, 

 often irregular, with usually four small oval stigmata ; most of 

 the transverse vessels of one size, but occasionally a very wide 

 one present ; series of stigmata frequently crossed by a small 

 secondary vessel. 



Tentacles: About fifteen in number: five (?) long slender 

 ones with fine branches and smaller intermediate ones of at least 

 two sizes. 



Peripharyngeal Band : Widely separated from the tentacles, 

 enclosing a large triangular space on the dorsal side on which 

 the dorsal tubercle lies ; mouth of the hypophysis with both 

 horns turned in and once coiled (PI. XIX., Fig. 24). 



