322 BIOLOGICAL SURVEY OF 



proximal margin, but this is often obscured from above by an 

 overhanging umbo. Ooecia globose, punctured, borne on 

 slightly dwarfed zooecia which often stand erect among the 

 other cells. No avicularia. 



HippoTHOA EXPANSA Dawsou, 1859. PI. 9, fig. 4. (Dawson, 

 1859, p. 255; Packard, 1869, p. 270; Verrill, 1885, p. 232 

 {H. divaricata var. expansa) ; Whiteaves, 1901, p. 101, for 

 Canadian records.) Rare, dredged at stations 27, 53, 64, and 

 65 ; small colonies on pebbles. It is a northern species, rang- 

 ing to Greenland, Jan Mayen, and Franz Josef Land, and 

 has been taken in the British Islands. It is an inconspicuous 

 form, with narrow branches of 1 to 3 zooecia in width, adher- 

 ing closely to a shell or pebble, and semi-hyaline. The sinuate 

 orifice, lateral basal expansion of the zooecium, and the re- 

 duced fertile zooecia easily distinguish it from any other 

 species. 



The zoarium forms small branching colonies, adnate to 

 stones and shells. One to three zooecia in alternating series 

 in a branch. Margins of the lateral zooecia are expanded 

 all along the dorsal side, this expansion frequently being half 

 as wide as the zooecium. The front is definitely rugose, the 

 rugosities extending out over the expanded margin. Aperture 

 rounded, with a small proximal sinus. Ooecia globose, with 

 a few punctures and a median rib. The fertile zooecia are 

 somewiiat smaller than the infertile ones. 



Galeopsidae Jullien, 1903 

 Cylindroporella Hincks, 1877 



Cylindropoeella tubulosa (Norman), 1868. PI. 14, fig. 1. 

 (Whiteaves, 1901, p. 98 (Forina), Canadian records; Osburn, 

 1912, p. 233 (Porina), vicinity of Cape Cod.) Not infrequent 

 on stones and shells, found at six shore stations and thirteen 

 dredging stations. Northern in distribution, ranging from 

 Greenland and Spitzbergen south to the British Islands and 

 Cape Cod. 



The colonies are always small, rarely i-inch across, the 

 zooecia forming a single layer. The tall tubular peristome. 



