250 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



longest 12 mm; they are all in the same plane but are irregularly placed, 

 usually more of them on one side than on the other, but never numerous ; 

 except that they are more slender, they are much like the main stem. The 

 hydrothecae are of medium size, 0.65 mm in length, nearly tubular, not 

 curved outward very strongly; on the face the pair is contiguous for about 

 half the length, but on the back there is no such contact, as the hydro- 

 thecae are fronto-laterally placed. Two pairs in succession are separated 

 by about one-third of the length of the hydrotheca. There are 2 teeth on 

 the margin, and the operculum has 2 flaps. 



Gonosome. — Not observed. 



Distribution. — Station 1075-40, inside Georges Island, near the head 

 of the Gulf of California, llJ^-13 fathoms. 



Sertularia stookeyi Nutting 

 Sertularia stookeyi Nutting, Amer. Hyd., II, 1904, p. 59. 

 Fraser, Hancock Hyd., 1, 1938, p. 55. 

 FR.4SER, ibid., 3, 1938, p. 135. 



Distribution. — 3 miles NW of Natividad Island, Lower Calif., 30-31 

 fathoms; Dewey Channel, opposite San Eugenio Point, 21-24 fathoms; 

 Puerto Refugio, Angel de la Guardia Island, Gulf of California, shore ; 

 east of San Esteban Island, 20-70 fathoms ; Santa Elena Bay, Ecuador, 

 2-7 and 8-10 fathoms; North Seymour Island, Galapagos, shore; Stephens 

 Bay, Chatham Island, 12 fathoms. 



Genus THUIARIA 

 Thuiaria crisioides (Lamouroux) 

 Dynamena crisioides Lamouroux, Descr. Polyp. Flex., 1824, p. 613. 

 Dynamena tubuliformis Marktanner, Hyd. K. K. Nat. Hof-Museums, 



1890, p. 238. 

 Thuiaria tubuliformis Eraser, Hancock Hyd., 1, 1938, p. 56. 



Eraser, ibid., 3, 1938, p. 135. 



Thuiaria crisioides Eraser, Atlantic Hyd., 1944, p. 296. 



Distribution. — (All samples except those especially noted were ob- 

 tained by shore collecting.) East of White Friars Islands, Mexico, 5-10 

 fathoms; Tangola Tangola; Playa Blanca, Costa Rica; Port Parker; 

 Gulf of Dulce ; south of Mala Point ; Port Culebra ; Wafer Bay, Cocos 

 Island; Balboa, Canal Zone; Octavia Bay, Colombia; Cupica Bay; Port 



