322 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



operculum has the form of the aperture, moderately chitinized, with a 

 narrow thickened border, and the muscle attachments well removed from 

 the margin. Small lateral-oral avicularia are present distal to or at both 

 sides of the sinus, a little elevated and with a rounded or triangular 

 mandible ; similar small avicularia with a short-pointed mandible occur 

 more proximally on the front. 



The ovicell closely resembles that of S. cornuta and Stephanosella 

 biaperta, imperforate, rounded and prominent when young but later 

 much embedded, with a radiately grooved surface which is partially 

 covered by a secondary wall from the distal zooecium, leaving a rounded 

 area on the top ; not closed by the operculum ; width 0.20 mm. 



The species has a close resemblance to 5. cornuta (Gabb and Horn), 

 especially in the characters of the ovicell, but the sinus is much wider 

 (not V-shaped), and the ovicells more embedded, the most important dif- 

 ference being in the form of the aperture and operculum. 



Type, AHF no. 60. 



Type locality, Hancock Station 147-34, Tagus Cove, Albemarle 

 Island, Galapagos, 0°16'38''S, 91°22'44''W, at 30 fms. Also taken at 

 Stations 155-34 and 156-34, off Tagus Cove, Albemarle Island at 50 to 

 60 fms; 190-34, off Albemarle Island; 352-35, Chatham Island; 810-38, 

 Barrington Island, all from the Galapagos Islands; and 674-37, Pulpito 

 Point, Lower California, Gulf of California, 26°30'00''N, 111°27'10'' 

 W, the most northerly record. Depth range 14 to 60 fms. 



Genus EMBALLOTHECA Levinsen, 1909 



Frontal a tremocyst with numerous pores; aperture usually with a 

 broad shallow sinus, cardelles present; operculum moderately chitinized, 

 the muscle attachments near the border. Avicularia frontal, usually some- 

 where near the aperture. No spines. Ovicell hyperstomial and closed by 

 the operculum, perforated like the frontal; the aperture of the fertile 

 zooecium is noticeably broader. 



The genus is much like Dakaria, but is useful to receive the schizo- 

 porellids which have the ovicell closed by the operculum and possess avicu- 

 laria, which are wanting in Dakaria. Genotype, Lepralia quadrata Mac- 

 Gillivray, 1880. 



