NO. 1989. ASCIDIANS FROM NORTHEASTERN PACIFIC— RITTER. 447 



HALOCYNTHIA HAUSTOR FOLIACEA, new subspecies. 

 Plate 33, fig. 7. 



Tlie specimens of Halocynthia which I am considering, provisionally, 

 as a subspecies of H. Tiaustor stand, according to the evidence now 

 at hand, about midway in their resemblances between H. joTinsoni 

 and H. Jiaustor with features sufficiently different from both to 

 entitle them to independent specific rank should the examination 

 of more material establish the constancy of the characters used for 

 separating them as a subspecies. 



The strikingly distinctive features about them pertain to the gen- 

 eral external appearance. Irregular in form as individuals of both 

 johnsoni and Jiaustor usually are, the animals now before me are far 

 more so than anything I have ever seen in these species. The irregu- 

 larity is due chiefly to the extent and character of the outgrowths on 

 the test. Some of these, particularly on the siphons and toward 

 the anterior end of the body, are quite remarkable, being long, more 

 or less flattened,and broadest at the distal end. They may reach a 

 length of nearly 12 mm. and these largest longest ones are quite 

 flexible or pendulous. They might properly be spoken of as foUace- 

 ous (pi. 33, fig. 7). On portions of the body where there are no such 

 elaborate outgrowths the test is still deeply, though irregularly cor- 

 rugated, the sharply projecting ridges being clearly of the same 

 general nature as the foliaceous warts. In these regions the sur- 

 face is not greatly different from that of the typical Jiuustor. 



The color is dark brown, the processes and higher ridges inclining 

 to reddish. 



On the whole the animals appear to be shorter m proportion to the 

 greatest transverse diameter than is either haustoj' or johnsoni, though 

 in proportions, as well as in surface features, the irregularity is very 

 great. 



The height, exclusive of the siphons and processes, of the speci- 

 men shown in figure 7 is about 2 cm., and the greatest transverse 

 diameter is 3.5 cm. But some of the iiidividuals are higher pro- 

 portionally. 



In external characters the animals undoubtedly resemble Jiaustor 

 more than they do joJinsoni. 



On the other hand, as regards the one internal feature to which, 

 so far as is now known, Jiaustor and joJinsoni are distinct from each 

 other, namely, the tentacle number, the specimens now under con- 

 sideration resemble more joJinsoni. In four specimens examined the 

 numbers counted were 34, 30, 28 or 30, and 26, the last being a small 

 individual. The average number for typical Jiaustor is about 21 

 while the average for joJinsoni is 42. 



The scheme of internal longitudinal vessels for the right side of 

 two specimens was: 



Fu-st. D. L. '^.-9-3-21-1-21-1-23-5-18-3-11-2 = 118. 

 Second. D, L. '^-'^-2-20-3-18-2-16-7-12-6-12-3^101. 



