244 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



San Benito Islands, 44-49 fathoms; 5J^ miles south of San Benito Is- 

 lands, 66-81 fathoms; 8^ miles south of San Benito Islands, 71-72 fath- 

 oms; 3 miles NW of Natividad Island, 30-31 fathoms; 4 miles north of 

 Dewey Channel, 24-25 fathoms; off Braithwaite Baj^, Socorro Island, 

 17-46 fathoms; north of Clarion Island, 35-36 and 30-40 fathoms; San 

 Jaime Bank, off Cape San Lucas, 75 and 120 fathoms; off Los Frailes, 

 Gulf of California, 5-15 fathoms; Aqua Verde Bay, shore; off White 

 Rock, Isla Partida, 45 fathoms; north of Isla Partida, 10 and 46-75 fath- 

 oms; Puerto Refugio, Angel de la Guardia Island, 11-22 and 78-90 fath- 

 oms; between Angel de la Guardia and Mejia Islands, 6-11 and 51-54 

 fathoms; off San Pedro Nolasco Island, 55-57 fathoms; Gulf of Dulce, 

 Costa Rica, 19-48 fathoms. 



Sertularella rugosa (Linn.) 

 Sertularia rugosa Linnaeus, Syst. Nat., 1758, p. 813. 

 Sertularella ruffosaFRASER, Hyd. Pacific Coast, 1937, p. 157. 



Fraser, Hancock Hyd., 1, 1938, p. 52. 

 Fraser, ibid., 3, 1938, p. 134. 

 Distribution. — Off Redondo Beach, Calif., east of Point Fermin, 

 shore; Santa Maria Bay, Lower Calif., 5-25 fathoms; off Lobos de 

 Afuera Islands, Peru, shore and 25-30 fathoms. 



Sertularella similis, new species 

 Plate 28, Fig, 19 



Trophosome. — Colony rigid, 25 mm, or usually much less, un- 

 branched, or with one or two branches given off nearly at right angles, 

 seemingly loosely attached to the stem, as though a planula had settled on 

 the surface and started to grow a colony. There is little or no indication 

 of nodes, but the hydrothecae are given off in regular alternation. The 

 hydrotheca is large, nearly 1.0 mm in length, not extensively immersed, 

 but projecting outward at a wide angle to the stem. There are 4 teeth on 

 the margin, and 4 flaps in the operculum. The special feature is the nature 

 of the transverse corrugations; they are narrow, with a distinct ridge, 

 and hence numerous; they pass all around the hydrotheca. 



Gonosome. — Not observed. 



Distribution. — Station 561-36, south of Isla Partida, Gulf of Califor- 

 nia, 70 fathoms. 



Remarks. — The trophosome of the species resembles that of S. conica 

 Allman in almost every character. The feature difference is the numerous 

 corrugations, so strongly marked, passing all around the hydrotheca, that 

 take the place of the few, incomplete annulations that appear in S. conica. 



