468 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Hippopodinella turrita new species 

 Plate 56, fig.l3 



Zoarium encrusting, white. Zooecia of moderate size, 0.40 to 0.55 

 mm long by 0.30 to 0.35 mm wide; considerably inflated and very dis- 

 tinct ; frontal rough, a tremocyst with numerous pores, the areolar pores 

 larger with strong, short ribs between them. The primary aperture is 

 widely removed from the distal zooecial border; similar in form to that 

 of H. adpressa but smaller (0.12 mm long by 0.08 mm wide), the poster 

 a little wider than the anter and nearly straight on its proximal border; 

 condyles strong. The primary peristome is low and thin; a heavy sec- 

 ondary peristome, formed by the frontal and roughly corrugated, sur- 

 rounds this on all sides without obscuring the aperture. With complete 

 calcification this secondary peristome or shield often bears several strong, 

 erect, conical processes ; typically one either side opposite the cardelles and 

 two somewhat smaller ones distal to the aperture, but the distal ones 

 may vary from 1 to 3 ; rarely a similar process may occur elsewhere on 

 the front, and any or all of the processes are frequently wanting. The 

 turrets sometimes bear small rounded avicularia at their tips, but more 

 frequently they are merely pointed. Ovicell endozooecial and not evi- 

 dent on the surface. 



Two characters apparently distinguish this species from others of 

 the genus; 1, the distance between the aperture and the distal zooecial 

 wall; 2, the broad, heavy, tuberculate distal rim of the secondary 

 peristome. 



Type, AHF no. 101. 



Type locality: Hancock Station 452, Charles Island, Galapagos, 

 (Post OflSce Bay), 65 fms, one colony on a gastropod shell. Also taken 

 at Station 438, Chatham Island, Galapagos, one colony. 



Genus ENANTIOSULA Canu and Bassler, 1930 



"Without ovicell. The zooecia are surrounded by a common row 

 of parietal dietellae. The frontal is a tremocyst. The peristomice 

 (apparent aperture) is semielliptic. The operculum has the form of a bell 

 with concave proximal border. There are two oral avicularia with beak 

 converging on the axis of the distal half of the aperture." (Canu and 

 Bassler, 1930:23). Genotype, Enantiosula manica Canu and Bassler. 



This genus was questionably referred by Canu and Bassler to the 

 "Escharellidae," but in the absence of ovicells, cardelles, sinus and 

 proximal peristome it seems better to relegate it to the family Cheilo- 

 porinidae along with Tremoschizodina. 



