ART. 13 BRYOZOAN FAUNA CANU AND BASSLER 15 



deira, in shallow water; Cape Verde Island, 110-180 meters. West- 

 ern Atlantic: Beaufort, South Carolina; Tortugas, 8-24 meters; 

 Gulf of Mexico at Habana, 98-325 meters and Florida, 41-97 meters. 

 Indian Ocean: Amirante, 37-137 meters; Saya de Malha, 47-202 

 meters; Wasin, British East Africa, 16 meters; Mauritius; Tizard 

 Banks, China Sea, 43 meters. Pacific: Philippines at Jolo, Sulu 

 Sea, 30 meters, in the Celebes Sea, 372 meters and 11.6° C. and at 

 Anima Solo, 170 meters and 17.2° C. (specimens all dead) ; Murray 

 Islands, Torres Strait, 2^32 meters ; Port Phillips Heads, Australia ; 

 Sif u. Loyalty Islands ; Galapagos Islands, 54^65 meters. 

 Cat. No. 8471, U.S.N.M. 



Family GALEOPSIDAE Jullien, 1903 

 Genus SEMIHASWELLIA Canu and Bassler, 1917 



SEMIHASWELLIA SULCOSA, new species 



Plate 10, Figures 4^8 



Description. — The zoarium is free, branching dichotomously at 

 intervals usually of 5 to 7 mm. The zooecia are indistinct, gigantic ; 

 the frontal is formed by a very thick epitheca ornamented with very 

 deep longitudinal sulci at the bottom of which are large vacuoles 

 rather close together. The peristome is long, cylindrical, salient, 

 oblique. The peristome is thick, sharp edged, orbicular. The aper- 

 ture is buried at the bottom of the peristomie. The ascopore is 

 tubular, salient, oriented toward the proximal zooecium. A small 

 orbicular avicularium (?) appears sporadically on the frontal in the 

 vicinity of the peristomie of an adjacent zooecium. On the dorsal 

 of the colony there are deep longitudinal sulci with large vacuoles 

 rather close together. Small orbicular avicularia replace the vacuoles 

 about the level of the peristomes of the cellular face. 



Measurements . — 



„ . fZs=2.75mm. ^^ . , (A» = 0.45mm. 

 Zooecia^, ^ „^ Peristome {, '^ „.„ 



|?2 = 1.00mm. \lp=0A5mm. 



Affinities. — This species differs from the genotype Semihaswellia 

 proboscidea Waters, 1889, from St. Thomas (West Indies), in its 

 smaller peristomes and in the presence of deep longitudinal sulci 

 arranged on both sides of the colony. The dimensions of the fossil 

 species (Jacksonian) collected in America are much smaller than 

 those of the two known recent species of the genus. The discovery 

 of the genus Semihaswellia in the Pacific is very interesting. 



Occurrence. — Galapagos Islands, D. 3408. 



Holotype.—C2ii. No. 8536, U.S.N.M. 



