BRYOZOA OF WOODS HOLE REGION. 



223 



mon on the upper branches, arising from the sides of the cells above the lateral avicularia, enlarged 

 toward the end. 



Found in the outer waters of the region, sometimes abundant, at 8 to 25 fathoms. Attached to 

 shells, stones, hydroids, other Bryozoa, etc. Off Gay Head, S. W., Crab Ledge, Great Round Shoal, 

 off Sankaty Head, etc. 



While Desor's description of his Cellularia densa is too inadequate to determine the species under 

 any other conditions, I am satisfied from having dredged the type locality that the above synonymy is 

 correct, and Verrill has already placed it here questionably. 



Genus CELLULARIA Pallas, 1766. 

 Cellularia peachii Busk. [PI. xxi, fig. 20 bis.] 



Busk 1851, p. 82. 



Packard 1867, p. 272. 



Verrill 18793, p. 53, and 18790, p. 29 (Bugulopsis peachii). 



Whiteaves 1901, p. 92. 



Zoarium dichotomous, phytoid. Zooecia biserial and alternating, elongate, attenuated below, a 

 short spine on the upper, outer angle (often wanting) ; at the terminus of each internode the cell situated 

 between the bases of the branches has this spine situated mesially at the top. Aperture oval, or nar- 

 rowed below, margin slightly thickened, frequently minutely granulated, dorsal surface smooth, with 

 several (3 to 5) perforations. Ooecia subglobose, the surface tesselated. 



Apparently rare. A few small specimens attached to shells and to Bmjiila munayana, taken at Great 

 Round Shoal in 8 fathoms. The species has not heretofore been noted south of Canadian waters. 



Genus SCRUPO CELL ARIA Van Beneden, 1844. 

 Scrupocellaria scabra (Van Beneden). [PI. xxi, fig. 20, pi. xxxr, fig. 95.] 



Van Beneden 1849, p. 73 (Cellarina scabra). 

 Verrill 18793, p. 53 (Cellarina scabra). 

 Verrill 18790, p. 29 (Cellularia scabra). 

 Whiteaves 1901, p. 93. 



Zoarium dichotomous, internodes with 5 to 12 cells. Zooecia short, narrowed below, aperture 

 oval, occupying more than half of the front, with a smooth border; one or two stout spines on the outer 

 margin above, and a small one on the inner margin; shield or scute entire, suboval, the surface figured 

 with a lobate or antler-like area, often not well developed. Vibracular cells wedge-shaped, placed 

 transversely across the back of the zooecium (often wanting), with a short vibraculum which is not longer 

 than the zooecium. Radical fibers long and slender, scattered over the whole zoarium. Ooecia some- 

 what flattened in front, subglobose, a smooth subtriangular space above the aperture, from which fine 

 lines radiate toward the margin. 



Rather rare. Crab Ledge and off Sankaty Head, on shells and stones. Woods Hole harbor in drift. 

 The latter specimen must have been carried in from outside waters, for the examination of several 

 hundred dredge hauls in Vineyard Sound and Buzzards Bay did not reveal it. 



Family BICELLARIID^ Hincks, 1880. 



KEY TO GENERA. 



Zooecial orifice subterminal, facing partly upward, the margin with several very long, slender spines, 

 one placed just below the orifice Bicellaria. 



Zooecial orifice occupying a large part, sometimes nearly the whole, of the front of the zooecium, no 

 spine below the orifice Bugula. 



