304 BIOLOGICAL, SURVEY OF 



they may be distinct. The ooecium is very irregular in form 

 and distributed among the bases of the erect portions of the 

 tubules. The ooeciostome opens sidewise at the end of a 

 short tube which is about the size of the ordinary tubes. 



? TuBULARiA LOBULATA (Hassall), 1841. PL 1, fig. 9; pi. 3, 

 figs. 1-5. (Whiteaves, 1874, p. 6; 1901, p. Ill, Gulf of St. 

 Lawrence.) Whiteaves' material was identified by Norman, 

 who considered the T. lohulata of Hincks as distinct from the 

 T. lohulata of Hassall, according to Dr. Anna B. Hastings 

 (in litt.). However, as Norman had a specimen of this same 

 species in his collection labeled 'D. diastoporides/ it might 

 appear that neither he, nor Hincks, nor anyone else for that 

 matter, knew any too much about it. Miss Hastings has gone 

 carefully over our material, comparing it with that in the 

 British Museum, and has come to the conclusion that ''it is 

 likely that it is T. lohulata Hassall." We can give a detailed 

 account of the ooecium and some other notes from our Ameri- 

 can material which may be of use. 



Zoarium a simple fan-shaped or somewhat lobulated incrus- 

 tation on stones and shells. The crust is thick, much thicker 

 at the middle, and three or four rows of incomplete zooecia 

 appear successively in a graded series beyond the developed 

 zooecia. The zooecial walls are heavily calcified, the erect 

 portions of the tubes thick, and there is no evidence of punc- 

 turing of the Avails, except slightly in the earliest zooecia of the 

 colony. The zooecial apertures appear to vary greatly, but 

 on the average measure about 0.16 mm. in diameter. The 

 ooecia are quite irregular in outline, usually bilobulate, but 

 sometimes transversely elongated, and distinctly flattened or 

 even depressed on the frontal surface. Its surface is dis- 

 tinctly punctured. The ooeciostome is much smaller than the 

 zooecial aperture, rounded, only slightly raised, and usually, 

 if not always, located close beside a zooecial tube. Its wall 

 is somewhat thickened and the aperture measures about 0.07 

 mm. in diameter. 



At Mt. Desert Island the species occurs rather uncommonly 

 on stonv bottoms, but was taken at fifteen stations. Whit- 



