The Bryozoa of the Tortugas Islands, Florida. 185 



Genus Barentsia Hincks, 1880. 

 Barentsia discreta (Busk). 



Busk, 1886, p. 44 (Ascopodaria discreta). — Jullien, 1888, p. 13 (Pedecellina austra- 

 lis). — (?) Verrill, 1900, p. 594 {Barentsia titnida sp. nov.). — Waters, 

 1904, p. 99. — OsBURN, 1912, p. 214. 



This species, first described from Tristan da Cunha in the Challenger 

 reports, is now known to be widely distributed, as follows: Tristan da 

 Cunha, 100 to 150 fathoms (Busk); China Sea, 27 fathoms (Kirkpatrick) ; 

 Cape Horn, 26 fathoms (Jullien); He Londonderry, Magellanes, Chile 

 (Waters) ; Woods Hole, Massachusetts (Osburn) ; Beaufort, North Carolina 

 (Osburn); Tortugas, Florida (Osburn). 



If Verrill's Barentsia timida from the Bermudas is the same species, as 

 I strongly suspect, this will add another locality. Verrill states in regard 

 to his B. timida that it is closely allied to B. discreta, but that the latter has 

 a shorter and more annulated basal cylinder and also several annulations 

 of the stem below the base of the cup. In my experience, the annulations 

 of the stem are of little importance, if any, as there is much individual vari- 

 ation which may represent only differences in contraction at this point. 



The individuals are small and the species may readily escape observation. 

 It appears only once in my collection made at the Tortugas, being dredged 

 in 18 fathoms directly north of the island on a bottom of coral mud; several 

 fragments of colonies attached to shells. 



CYCLOSTOMATA. 



Genus Crisia (part) Lamouroux, 1816. 



? Crisia denticulata (Lamarck). 



Lamarck, i8i6, p. 137 (Cellaria denticulata). — Stimpson, 1853, p. 18. — Smitt, 1872, 

 p. 4 (Crista eburnea). — Jelly, 1889, p. 73. — Harmer, 1891, p. 136. — Verrill, 

 1879, p. 28; 1900, p. 592. — Whiteaves, 1901, p. no. — Osburn, 1912, p. 216. 



Numerous small colonies were taken at from 10 to 15 fathoms in various 

 places about the island, attached usually to sponges and shells. Smitt 

 records the species as C. eburnea from 7 to 60 fathoms. Stimpson (1853), 

 Verrill (1879), and Whiteaves (1901) have recorded it from New England 

 to Canada, though these records are questionable on account of failure 

 to consider the ooecia, and the writer has recorded it questionably from 

 Woods Hole, Massachusetts (ooecia wanting). Verrill has reported it as 

 common at Bermuda. 



Harmer (/. c), referring to Smitt's Florida record, states: " I do not feel 

 certain that the form described is really identical with C. ramosa, although 

 it can hardly be regarded as C. denticulata," and suggests that it may be 

 Stimpson's C. cribraria. It does not seem to agree with the latter species, 

 however, in any essential point (see Osburn, 1912, p. 215, for redescription 

 of C. cribraria), nor does it agree with C. ramosa, in which the radical 

 fibers have long internodes with yellow or colorless joints. It does agree 

 with C. denticulata in having short internodes in the radical fibers and the 



