320 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Hancock Stations: 136-34 and 137-34, Clarion Island, W. of 

 Mexico, 32 to 57 fms; 275, Raza Island, Gulf of California; 468-35, 

 Port Parker, Costa Rica; 1064, Santa Barbara Island and 1191-40, 

 Santa Cruz Island, southern California. Depth range 5 to 57 fms. 



Schizoporella cornuta (Gabb and Horn), 1862 

 Plate 37, figs. 9-11 



Reptescharellina cornuta Gabb and Horn, 1862:147. 

 Schizoporella hiaperta, Hincks, 1883 :447. 

 Schizoporella biaperta, Robertson, 1908:287 (part). 

 ? Schizoporella biaperta, O'Donoghue, 1923 :35. 

 ? Stephanosella biaperta, O'Donoghue, 1926:58. 

 Stephanosella biaperta, Canu and Bassler, 1923 :99 (part). 

 Schizopodrella biaperta, Canu and Bassler, 1930 :16. 



This species has been confused with Stephanosella biaperta Michelin, 

 probably because of the striking similarity of the ovicells and the presence 

 of lateral-oral avicularia; it has a porous frontal (tremocyst) while that 

 of biaperta is an olocyst with only areolar pores, and it is a smaller species 

 in all its measurements with less embedded ovicells. The original descrip- 

 tion is excellent as far as it goes, even to the communication pores: 



"Colony encrusting, cellules agglomerated, only in one layer; quad- 

 rangular in form ; sides nearly parallel, sometimes slightly curved. Mouth 

 terminal, round to transversely elliptical, often bordered by a very small 

 lip (peristome) ; proximal lip deeply notched. Special pores (avicularia) 

 abreast of, or in advance of the mouth, placed at the end of somewhat 

 conical tubes arising from the distal angles of the cellule, and looking 

 almost directly forwards. Surface broadly convex and coarsely punctate 

 (a tremocyst). The connecting pores (septulae), between the cellules 

 are large and few in number. We noticed but one lateral one, invariably 

 placed near the proximal end of the cellule and almost at the bottom of 

 the side wall. No abortive cellules, nor ovarian vesicles (ovicells) were 

 observed." 



The zooecia are usually between 0.45 and 0.55 mm long by 0.30 

 to 0.40 mm wide; the aperture measures about 0.13 mm in either dimen- 

 sion, with a V-shaped sinus, and the ovicell 0.18 to 0.20 mm in breadth. 



The ovicell is prominent, globular and only partially embedded even 

 in advanced calcification, not closed by the operculum; imperforate, its 

 frontal surface radiately grooved, the secondary cover incomplete and 

 exposing a rounded area on the top, appearing to have a peripheral row 



