. Ascidians from the coasts of Canada [microform]. Sea squirts; Tunicata; Ascidies (Tuniciers); Tuniciers. 1911] ASCIDIANS FROM THE COASTS OF CjMKDA. tag About IS gastric folds. Apparently about is atrial tentacles. Up to 10 or II tentacles grouped at anterior end beneath pharynx. A row of testes on each side posteriorly and ventrally. In the right row there are from 6 to la and in the left from 3 to 3. They are imbedded in the test. Several colonies were obtained on the beach at Hope Island, by Rev. Mr. Taylor in 1906. This form is doubtfully distinct from M. dura Ritter from Santa Barbara, C
. Ascidians from the coasts of Canada [microform]. Sea squirts; Tunicata; Ascidies (Tuniciers); Tuniciers. 1911] ASCIDIANS FROM THE COASTS OF CjMKDA. tag About IS gastric folds. Apparently about is atrial tentacles. Up to 10 or II tentacles grouped at anterior end beneath pharynx. A row of testes on each side posteriorly and ventrally. In the right row there are from 6 to la and in the left from 3 to 3. They are imbedded in the test. Several colonies were obtained on the beach at Hope Island, by Rev. Mr. Taylor in 1906. This form is doubtfully distinct from M. dura Ritter from Santa Barbara, California. It differs from the descriptimis of the latter, given by Ritter and Michaelsen, in having a smaller number of oral tentacles and a larger number of gastric folds. The differences in the reproductive organs are probably referable to the greater maturity of the colonies from Hope Island. M. taylori sp. n. This is a social species, the individuals being connected by stolons alone. The largest individuals are 7X5 mm., in shape more or less hemispherical. Apertures are transverse slits. The suHace is smooth or slightly wrinkled. The test is thin. The structure of the pharynx is the same as has been described for the last species. Thirteenor 14 gastric folds. Atrial tentacles minute. In one individual there were counted 11 ovaries, 9 testes on the right side and 11 testes on the left. This form is so nearly identical in anatomical details with the pre- ceding species, that one considers the possibility of their being different forms of the same species, just as Ritter has considered that Perophora annectens may form either social or compound colonies. With our present knowledge we must consider this form distinct from M. dermatina, the differences being,—'social' instead of compound colonies, larger Individ* uals and colonies white instead of dark purple. Subfamily—Stydina*. Genus, Katatropa nov. Syn.—Styda auct. part. Sii^ons with spinules. Four folds on each s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectseasqui, bookyear1912
