BRYOZOA OF WOODS HOLE REGION. 2iy 



belong to denticulata, but as no fully developed ovicells have been seen, I have not been able to arrive 

 at a positive determination. The species has been recorded on the American coast from Florida, the 

 Bay of Fundy and the Gulf of St. Lawrence. 



Family TUBULIPORID^E Johnston, 1838. 



KEY TO GENERA. 



Zoarium encrusting or partly free, forming various sorts of expansions, entire, lobate, or branched. 

 Zooecia mostly connate in diverging series. Sometimes a fan-like colony is extended at the edges 

 to appear discoid at first glance Tubulipora. 



Zoarium (in our species) entirely encrusting, irregularly lobate, rather thin. Zooecia longitudinally 

 arranged, in great part immersed in the zoarium, the apertures widely separated. . . .Stomatopora. 



Genus TUBULIPORA Lamarck (pars), 1816. 



KEY TO SPECIES. 



1. Zoarium rising free from a small base, well branched, dichotomous, branches more or less triangular 



in cross section; zooecia disposed in alternate series on either side of the median line of the stem, 



connate and directed outward (Idmonea) atlantica. 



Not such characters 2 . 



2. Ooeciostome large, at least as large as the aperture of the cells, turned side wise so as to open hori- 



zontally (Idmonea serpens) liliacea. 



Ooeciostome small, directed upward, conspicuously flattened side wise, the aperture not more than 

 half as large as the apertures of the cells flabellata. 



Tubulipora atlantica (Johnston). [PI. xix, fig. 9, ga.] 



Johnston 1847, p. 278 (Idmonea atlantica, from Forbes' MS.). 



Verrill 18790, p. 28 (T. atlantica and Fasciporina flexuosa). 



Harmer 1898, p. 88-9 (reasons for combining Idmonea with Tubulipora). 



Cornish 1907, p. 78 (Idmonea atlantica). 



Zoarium erect and spreading, irregularly branched dichotomously, the branches mostly in the 

 same plane, triangular in section, the dorsal side striated and finely punctate. Zooecia i to 4 or 5 in 

 each series, connate, the innermost the longest, the apertures directed somewhat outward, leaving a 

 free space in the middle of the front side of the stem. In this space the ooecium develops in a very 

 irregular elongate form, swollen and involving the bases of the zooecia. Although the species has been 

 figured by various authors, no one so far as I am aware has figured or mentioned the Ooeciostome. In 

 some well-developed specimens from Crab Ledge I find what I take to be this organ, which Harmer has 

 shown to be of so much importance in the determination of the cyclostomatous Bryozoa. It consists 

 of a tube, similar in size and length to the longest zooecium and connected with it, placed on the upper 

 side of the series and curved toward the tip of the branch. The stalk is flared somewhat trumpet-like 

 at its tip when fully developed, and the aperture, which is round, looks toward the tip of the branch. 

 Numerous specimens of this beautiful species were taken at Crab Ledge on August 12, 1909, dredged by 

 the Phalarope in 14 to 18 fathoms, attached to stones and shells. Although it is a widely ranging 

 species it has not heretofore been noticed in this region. 



Tubulipora liliacea (Pallas). [PI. xx, fig. 10, ioa.l 



Pallas 1766, p. 248 (Millepora liliacea). 



Stimpson 1853 (Idomcrnea pruinosa). 



Verrill and Smith 1874, p. 708 (T. flabellaris). 



Verrill 18753, p. 414, and 18790, p. 28 (T. serpens). 



Harmer 1898, p. 90-4 (synonymy of Idmonea and Tubulipora serpens, auctt.). 



Cornish 1907, p. 78 (Idmonea serpens). 



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