304 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The distal end rises into a long thin tubular peristome which bears a 

 small tubular ascopore near the base on the proximal side. No avicularia 

 and no spines. 



The hyperstomial ovicell is situated low down on the distal side of 

 the peristome. 



North Atlantic and Arctic Oceans from Spitsbergen west to Dolphin 

 and Union Straits, Northwest Territory, Canada ; on the Atlantic coast 

 it ranges as far south as Cape Cod. I have found no record of its occur- 

 rence in the Pacific Ocean. 



Cordova, Alaska, Albatross, June 28, 1914; Punuk Island, Bering 

 Sea, 15 fathoms; Port Etches, British Columbia, from specimens in the 

 Los Angeles Museum, with no other data. Common at Point Barrow, 

 Alaska, Arctic Research Laboratory, G. E. MacGinitie, collector. It is 

 evidently a circumpolar species. 



Genus SEMIHASWELLIA Canu and Bassler, 1917 



Zooecia on only one side of the erect zoarium ; the dorsal side bears 

 only avicularia. Frontal and dorsal sides of the same nature, formed of 

 a tremocyst with sulci. A spiramen or "ascopore" below the base of the 

 peristome. (After Canu and Bassler, 1917:58.) Genotype, Porina 

 proboscidea Waters, 1889. 



Semihasw^ellia sulcosa Canu and Bassler, 1930 

 Plate 35, fig. 3 



Zoarium erect, branching dichotomously, without joints. Zooecia 

 gigantic, indistinct; deep longitudinal sulci, with large vacuoles at the 

 bottom; peristome long, cylindrical, oblique, thick, sharp edged, its 

 aperture orbicular. Ascopore tubular, salient, directed proximally. Small 

 orbicular avicularia (?) on the front, and small dorsal avicularia. The 

 zooecia measure 2.75 mm long by 1.00 mm wide and the peristome 

 0.45 mm high. (After Canu and Bassler 1930:15.) 



Described from the "Albatross" dredgings, "Galapagos Islands, 

 D. 3048." 



Hancock Station 481, Cartago Bay, Albemarle Island, Galapagos, 

 12 fms, several small branches. 



