46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Ophiodissa negligens, new species 

 Plate 11, Fig. 51 



Trophosome. — Colony small, 4 mm. high; stem geniculate, with 

 each part in succession arising from the distal portion of the previous 

 part, just below the hydrophore that terminates the part, or sometimes, 

 dichotomous, where two such portions are given off opposite to each 

 other, or the one part may divide dichotomously. Pedicel gradually in- 

 creasing in diameter and almost insensibly passing into the hydrophore, 

 which is not flaring. There is very little indication of annulation any- 

 where. 



Tentacular organs large, shaped like the hydrophores with their 

 pedicels; commonly one from each pedicel or portion of the stem. 



Gonosome. — Not observed. 



Distribution. — Port Utria, 40 fathoms, in 15 fathoms, and on coral 

 at low tide. 



Family Hebcllidae 



Genus HEBELLA 



Hebella calcarata (A. Agassiz) 



Lafoea calcarata A. Agassiz^ N. A. Acalephae, 1865, p. 122. 

 Hebella calcarata Fraser^ Beaufort Hyd., 1912, p. 371. 



Distribution. — Secas Islands, 25 fathoms; White Friars, 25 fathoms 

 and 5-10 fathoms; Isabel Island, 10-25 fathoms. 



Genus SCANDIA 



Scandia corrugata, new species 

 Plate 11, Fig. 52 



Trophosome. — Individual zooids growing from a delicate stolon, 

 creeping over Synthecium; each pedicel very short but distinct, making 

 an acute angle with the stolon. Hydrotheca nearly tubular, narrowing 

 suddenly at the base and truncated distally, but the distal end may 

 flare slightly; surface slightly but regularly corrugated; margin entire. 



Gonosome. — Gonangium small, growing at regular intervals from 

 the stolon; shorter than the hydrotheca; broadly oval, narrowing dis- 

 tally to form a distinct neck; surface corrugated. 



Distribution. — White Friars Islands, 25 fathoms; east of islands 

 off Navidad Head, 25-35 fathoms. 



