. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). through the test. The "anterior nervous tubercle" (dorsal tubercle) in MacLeay's species is said to have " many ; 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 ; By the "pharynx" is here evidently meant the entrance to the oesophagus; and this opening in our species, it will be observ
. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). through the test. The "anterior nervous tubercle" (dorsal tubercle) in MacLeay's species is said to have " many ; 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 ; 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 ; 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 ; 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
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