192 Papers from the Marine Biological Laboratory at Tortugas. 



Busk and S. macandrei Busk, and Waters has named a species from the 

 Red Sea 5. serrata on account of this character. Florida specimens of 

 S. cervicornis Busk show similar spines occasionally on the basal radicals. 

 S. cornigera is a very delicate species and the radical fibers are transparent 

 and thread-like, and this fact alone will serve to distinguish it from S. 

 cervicornis. 



Pourtales took the species at 270 fathoms, so it has a rather wide range 

 in depth and temperature. 



Scrupocellaria cervicornis Busk. 



Busk, 1852, p. 24. — Smitt, 1872, p. 14 {Cellularia cervicornis). — Verrill, 1900, p. 594. 



Occurs commonly about the islands, from low water to 18 fathoms, 

 growing on piles of docks, attached to stems of gorgonias, etc. Colonies 

 about 0.5 inch in height, with ooecia containing eggs, were taken from the 

 bottom of a skiff on June 23, which had been in the water only since May i. 

 Recorded by Smitt from 7 to 17 fathoms. 



The radical fibers, which are abundant at the base of the colony, are 

 usually smooth, but in a few cases they bear retrorse spines like those of 

 S. cornigera. In such cases the species are easily distinguished by the 

 fibers alone, as they are much coarser in cervicornis. The cervicorn spines 

 on the outer distal extremity of the zooecia are well marked. 



Genus Canda Lamouroux, 1816. 

 Canda caraibica Levinsen. 



Levinsen, 1909, p. 142. 



This species has been recently described by Levinsen, who gives no 

 further indication of its distribution than is embodied in his remark "plenti- 

 ful material of a West Indian species." Levinsen suggests the probability 

 that this species is identical with C. simplex Busk, but being unable to 

 determine this point he gives a new name to the West Indian material. 



Several colonies were taken by the writer at the Tortugas at a depth of 

 15 fathoms, attached to shells. The largest of these was not much over 

 0.25 inch in height and no ovicells nor avicularia were present. The 

 absence of an opercular spine and the length of the membranous frontal 

 area (two-thirds of the whole zooecium) show this form to be that described 

 by Levinsen. The vibraculum in some cases is longer than the width of 

 the branch. 



The other Florida species of this genus, C. retiformis Pourtales (1867, 

 p. no), which Levinsen wrongly attributes to Smitt, is quite distinct from 

 C. caraibica, since it possesses a broad opercular spine, the membranous 

 area is but little more than half as long as the zooecium, and there are 

 differences in the vibracula. C. retiformis was not found at the Tortugas. 



