NO. 1989. ASCIDIANS FROM NORTHEASTERN PACIFIC— RITTER. 479 



gonads can be found. This being the case, even its generic identity 

 must remain in some doubt. After Styela the genus to which it is 

 most likely to belong is Pandocia (or Polycarpa), and this is one of the 

 points that makes it interesting, for with this possible exception this 

 genus is not represented in the collection, nor is it known to occur in 

 Alaskan waters. I have suspected that the seeming absence of 

 gonads may be due to the fact that these may be present in the form 

 of immature polycarps and so might be mistaken for endocarps, which 

 are present in considerable numbers. However, such is not the case 

 so far as I can make out; and since in all recognizable particulars it is 

 a Styela, and since this genus is well represented in the region, I assign 

 it provisionally to this group. In nearly all respects it agrees with 

 S. loveni, but the internal longitudinal vessels are rather differ- 

 ent, there being fewer on the folds and more between them. The 

 formula is: 



L. 5-3-3-9-4:-5-2-12-2 j^ j 

 R. 3-5-2-11-2-6-3-11-5 



STYELOPSIS GROSSULARIA (Beneden). 



Asddia grossularia P. J. van Beneden, 1846, p. 61, pi. 4, figs. 7-11. 



Styela grossularia Traustedt, 1880, p. 416. 



Styelopsis grossularia Traustedt, 1882, p. 115. — Hartmeyer, 1903, p. 252, pi. 5, 



figs. 12, 13. 

 Dendrodoa grossularia Michaelsen, 1904, p. 19. 



Styelopsis grossularia Bjerkan, 1908, p. 9.- — Redikorzew, 1907, pp. 12, 28. 

 Dendrodoa grossularia Hartmeyer, 1909, p. 1361. — Van Name, 1912, p. 588, pi. 



64, figs. 118, 119. 



I can find no differences between the animals before me and the 

 descriptions of Styelopsis grossularia that would warrant the separa/- 

 tion of them from this species. The single cluster of specimens is a 

 very compact mass containmg 35 or 40 individuals ranging in size 

 from scarcely 1 mm. to 12 mm. in gi^eatest diameter. Many of the 

 small individuals are seated upon larger ones, the largest of all being 

 completely covered over by the coating of smaller ones. 



None of the individuals seem to approach the columnar form which 

 characterizes many though by no means all individuals of the species. 



The departure of these specimens from the grossularia type that may 

 possibly be important is the almost complete absence of siphons. 

 Although the orifices with their four lobes can readily be recognized, 

 there are no projecting siphons. Possibly, however, the absence of 

 siphons is more seeming than real. The specimen, from St. Paul 

 Island, is almost certainly a pick-up on the beach and had been sub- 

 ject to considerable buffeting before it was preserved. This, together 

 with the usual contraction which nearly aU ascidian orifices undergo 

 at death, may account for the absence of the structures. 



