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Show 9 1 0 ON THE ASCI-DIANS OF CAPE VERDE ISLAND. [D e c . 11, placed languets. Both languets and branchial papilla? resemble each other in size. The tentacles are simple and few in number, probably 8. The dorsal tubercle is an oval slit. The alimentary canal is of an opaque, greyish-yellow colour. The stomach has 10-12 longitudinal folds. The rectum is long and wide. Three small pieces were found. The most distinctive characters of this species appear to be the presence of distinct branchial papillae, the number of stomach-folds, and the short postabdomen. Family D id em n id .e Giard, 1872. L eptoclinum sp. One small colony of Leptoclinum (PI. LXV. fig. 23), growing on calcareous algae, came under observation. The zooids were quite disintegrated, and no diagnosis beyond that of the colony was possible. The colony in general appearance is white. An outer layer of a thin crust and a lower layer fairly thick, gelatinous and brownish, seemed to have at one time contained the zooids. The systems are not well defined. Common cloacal apertures are not apparent. The branchial apertures are 6-lobed. Stellate calcareous spicules are very numerous. Literature referred to. H e r dm an , W. A.-Report on the Tunicata collected during the Voyage of H.M.S. ‘ Challenger.' Part 1. Ascidiie Simplices. 1882. Part II. Ascidiae Compositae. 1886. H er dm an , W . A.-" A Revised Classification of the Tunicata. ' Journal of the Linnean Society, Zoology, 1891, vol. xxiii. p. 558. V an N am e , W il l ar d G.-" The Ascidians of the Bermuda Islands." Trans. Connecticut Academy of Arts and Sciences, vol. xi. 1902. EXP LAN A T IO N OF THE PLATES. P l a t e L X IV . Fig. 1. Part of branchial sac of Halocyntliia rubrilabia. X 250. (p. 904.) 2. Tentacles of H. rubrilabia. X 250. (p. 904.) 3. Dorsal tubercle of H. rubrilabia. X 250. (p. 904.) 4. llight side; 5. Left side of H . rubrilabia, showing ovaries (o), testes (l), intestine (i), and renal organs (r). X 40. (p. 904.) 6. Dorsal lamina showing languets of H. rubrilabia. X 250. (p. 90L) 7. Styela partita Stimpson. X 2. (p. 904.) 8. Halocyntliia rubrilabia Verrill. X 2. (p. 901.) 9. Dorsal tubercle of Styela 'partita. X 220. (p. 905.) 10. Ascidia obliqua Alder. X 1. (p. 905.) 11. Dissection of Ascidia obliqua showing coils of intestine, stomach, ami gonads. X 1. st, stomach, (p. 905.) |