TUNICATA OK THE TKIBILOF ISLANDS. 537 



HkrdiMan, W. a. 



1882. Report on tbe Tunicata collected during the voyage of FT. M. S. Challenger during the years 

 1873-1876. Challenger Reports, Zoology, Vol. VI, 1882. 



1886. Reijort on the Tunicata. Challenger Expedition, Part II. Ascidiae Compositae, 1886. 



1891. A Revised Classification of the Tunicata, with Definitions of the Orders, Suborders, Fam- 

 ilies, Subfamilies, and Genera and Analytical Keys to the Species. Linneau Society's Journal — 

 Zoology. Vol. XXIII, 1891. 



HaiTFELDT-KAAS, H, 



1896. Synascidiae. Den Norske Nordhavs-Expedition, 1876-1878, XXIII, Zoologi. 

 Ki/ER, John. 



1893. Oversigt over NorgesAscidia-. simplices. Christiania Videnskabs-Selskabs Forhandlinger, 

 No. 9. 

 Lahille, F. 



1890. Contributions a I'etude anatomique et taxonomique des Tuniciers. Thfeses, 1890. 

 MacLeay, William S. 



1824. Anatomical Observations on the Natural Group of Tunicata, with Descriptions of three 

 Species Collected in Fox Channel During the late Northern Expedition. Linnean Society 

 Transactions, Vol. XIV, 1824. 

 Savigny, Jules-Cesar. 



1816. Memoir sur les Animaux sans Vertfebres. 2d Partie, 1816. 

 Traustedt, M. p. a. 



1882. Die einfachen Ascidien (Ascidiae simplices) des Golfes von Neapel. Mittheil. a. d. Zoolog. 

 Station zu Neapel. IV Bd. 4 Hft. 



ABBREVIATIONS USED IN THE ILLUSTRATIONS. 



A Anterior, or siphonal end. 



B Base, or posterior end. 



a. I Atrial Ian guet. 



a. o Atrial orifice. 



a. t Atrial tentacles. 



b. f Branchial folds. 



b. s Branchial stigmata. 



br. s Branchial sac. 



br. si Branchial siphon. 



b. t Branchial tentacles. 



d. 1 Dorsal lamina. 



d. t Dorsal tubercle. 



emb Embryo. 



en'c "Endocarps." 



ep Epicardiac tubes. 



h Heart. 



i. 1. V Internal longitudinal vessels. 



m. c. v Muscle bands of circular vessels. 



o. oe OEsophageal mouth. 



o.p Optic pigment. 



06 Oisophagus. 



ov Ovary. 



p. b Peribranchial band. 



r --. Rectum. 



st Stomach. 



t Testis. 



ti, t2, U,t4 Transverse vessels of different orders. 



ts Test, or cellulose " mantle." 



V. d Vas deferens. 



y'k Yolk-containing mesenchyme cells. 



z Zooid. 



