52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Sertularella formosa Fewkes 



Sertularella formosa Fewkes^ Bull. Mus. Comp. Zool., Harvard, 



VIII, No. 7, 1881, p. 130. 



Nutting, Amer. Hyd., Part II, 1904, p. 104. 



Distribution. — Santa Elena Bay, 10-12 fathoms; San Francisco Bay, 

 2 fathoms; Gorgona Island, low tide and in 20 fathoms; Pacora Island, 

 15-25 fathoms; Secas Islands, 25 fathoms; White Friars, 25 fathoms; 

 east of islands off Navidad Head, 25-35 fathoms. 



Sertularella fusiformis (Hincks) 



Sertularia fusiformis HiNCKS, Ann. and Mag. Nat. Hist. (3), VIII, 



1861, p. 253. 



Sertularella fusiformis Nutting, Am. Hyd., Part II, 1904, p. 89. 



Distribution. — North of Wenman Island, low tide; off Albemarle 

 Point, low tide. 



Sertularella incisa, new species 

 Plate 12, Fig. 60 



Trophosome. — Most of the colonies unbranched, less than 2 mm. 

 high, erect, rigid, but not very stout; not very definitely divided into 

 internodes. Hydrothecae regularly alternate, distant; curved regularly 

 outward; about one half of the adcauline side adherent, with thick 

 chitin at the base. Margin with three teeth, two of them more distinct 

 than the third ; operculum of three flaps. 



When the colony is branched, the short branches may be quite close 

 to each other, on each side. The angle that the branch makes with the 

 stem seems to be continued as a curved incision into the stem, which 

 is characteristic. There is no hydrotheca in the axil. 



Gonosome. — Not observed. 



Distribution. — South Bay, Cerros Island, 10-15 fathoms. 



Sertularella rugosa (Linn.) 



Sertularia rugosa Linnaeus, Syst. Nat., 1758, p. 809. 

 Sertularella rugosa Hincks, Br. Hyd. Zoophytes, 1868, p. 259. 



