514 



THE FUR SEALS OF THE PRIBILOP ISLANDS. 



c'"":. 



through the test. The "anterior nervous tubercle" (dorsal tubercle) in MacLeay's 

 species is said to have " many spirals." These are undoubtedly the hypophysis mouth, 

 which in our species, as shown by the description, is horseshoe shaped. 



The "pharynx" of J), glandaria is described as being situated "at the bottom of 

 the body cavity." By the "pharynx" is here evidently meant the entrance to the 

 oesophagus; and this opening in our species, it will be observed, is on the dorsal side 

 of the branchial sac. (Fig. 3, o. ce.) 



In the structure of the branchial sac the two species differ in the number of longi- 

 tudinal vessels between the folds, there being three and sometimes four in our species, 



while there are oidy two in MacLeay's species. It is 

 *" thus seen that the two species are very distinct. 



Herdmau, 1882, has expressed the opinion that the 

 genus J)em<7ro<7oa. is not distinct from Sty'ela, The genus 

 is based on the position and character of the ovary, 

 this being single, branched, and situated on the right 

 side of the body here, while Styela has several uu/ 

 branched ovaries situated on both sides of the body. 



In his diagnosis of the genus Styela, written in 

 1882, Herdman speaks of the genitalia as being "in the 

 form of one or more simple, lobed, or branched bodies." 

 According to this definition Bendrodoa would, so far as this character is concerned, 

 be merged in Styela. The same author has, however, in his Revised Classification of 

 the Tunicata, 1891, stated that the gonads of Styela are present "on both sides of the 

 body." As this is essentially the view of the case held by Savigny, 181G, MacLeay, 

 1824, Hancock, 1868, and Heller, 1877, and others who have written about the genus, 

 it has seemed to me best to regard the difference as sufficiently great and constant to 

 justify the recognition of both genera. I do not, however, believe that it is any more 

 closely related to Styela than to Polyoarpa, or any more closely related to Styela than 

 the latter is to Polycarpa.^ There are a large number of specimens in 

 the collection, all from St. Paul Island. i, 



Dendrodoa subpedunculata, new species. 



General characteristics. — Subspherical; slightly elongated antero- 

 posteriorly, frequently showing a tendency to be pedunculated; some- 

 what laterally compressed. Usually attached by the posterior end, 

 and by only a small area, so that specimens may be more or less pen- 

 dulous. Of the two dozen specimens at hand, 13 are attached close 

 together on a small bit of seaweed, indicating an aggregated habit for 

 the species (fig. 7). In one instance two individuals were fused 

 together by their tests (fig. 7a). Jjength from 1 to 1.5 cm.; surface rather closely but 



' KisBr, 1893, has described and figured a species ■which appears to be Dendrodoa glandaria, or a 

 closely related form, but which he identifies as Styela aggregata J. Rathke, and he refers to Traustedt 

 as holding the same view. 1 find, however, on looking up the author's references to Traustedt that the 

 latter does not mention Dendrodoa, but he does say of Styela aggregata that the " genitalorgane sind 

 wie gewohnlich beiderseits eutwiokelt" (Traustedt, 1893). 



Riser does not believe that the single branched ovary as it exists in Dendrodoa ia a character of 

 sufficient importance and constancy to justify the founding of a new genus upon it. Since, however, 

 we now have three species in which the character is well defined and constant, they certainly do make 

 a distinct group, so why not call the group a genus ? 



