78 THE ZOOLOGIST. 



Archipelago." The author states that though the material is moderate in 

 amount, it nevertheless possesses interest in a fine mass of Nellia occulata. 

 Busk (preserved in spirit), which proves rich in minute forms, both of 

 Polyzoa and Hydroida. A new genus is described, provisionally ranked 

 amongst the BicellariidcB, and probably nearly related to Bugula. Stegano- 

 porella smithii is noted, the Mergai example being undoubtedly identical 

 with the Cornish species. A variety of Smitt's Schizoporella spongites is 

 described, forming a spreading crust, white and silvery, on stone. Buskia 

 setigera, n. sp. is figured. The occurrence of a second species of Buskia has a 

 positive interest as throwing further light on a peculiar kind of structure. 

 Hitherto the genus has been represented by Buskia nitens. Alder, a smaller 

 form than the present, which is not uncommon on the English coasts, and 

 ranges from the Mediterranean to the extreme north (Davis Strait, Barents 

 Sea, White Sea), and to the Queen Charlotte Islands in the North Pacific. 

 B. setigera is comparatively large ; and from the suberect habit of the 

 cell, the ventral aperture extending from tlie bottom (or nearly so) to the 

 top, is more apparent and more readily studied. The solid or chitinous 

 portion of the zocecium forms a kind of carapace closed in below by a 

 membranous wall. The polypide stretches along the upper portions of the 

 cell immediately beneath the chitinous shell, and issues at the top of the 

 oral area. The structure, so far as it can be determined in spirit-specimens, 

 is extremely simple ; there seems to be no trace of a gizzard. In the 

 setose portion of the tentacular sheath there is an interesting peculiarity. 

 The setae, before expanding, instead of being packed together so as to 

 form a straight pencil, are seen to be subspirally arranged, some tending 

 to one side, some to the other, and bear some resemblance to loosely 

 twisted strands in a cord. As the tentacular corona moves upward and 

 presses upon the base of the operculum, the setae disentangle themselves 

 and expand into the usual funnel-shaped figure. The setae with the 

 reversible portion of the sheath from which they rise equal the cell 

 in length. The four setose appendages placed round the upper portion of 

 the cell-margin form a very conspicuous and striking feature. When the 

 polypide is exserted, they are thrown back and stand out from the cell ; 

 when it withdraws they are brought together and project at the summit. 

 The tubular adherent processes given off from the lower part of the cell 

 correspond with the spines round the base of the zocecium in B. nitens. 

 The cells are developed in large numbers on the creeping stem, and the 

 habit of growth is luxuriant. 



Membraniporafavus, M. marginella, Lepralia robusta, Porella malleolus, 

 with others, are among the new species fully entered into. Of Hydroids, 

 Obelia andersoni and 0. bifurca are new to science, the latter probably 

 allied to the bicuspidata, Clarke, known from the Thimble Islands, coast of 

 New England. — J. Mubie. 



