326 



Escharina^ Gray, char, emend. 

 Schizoporella Hincks p. p., Mastigophora Hincks p. p. 



The zocecia, the aperture of which is as a rule provided with 3 — 8 spines, 

 have a more or less well-developed vestibular arch, and the primary aperture has 

 a sharply marked off, fairly deep sinus, the breadth of which is at least one- 

 third of the breadth of the whole aperture. On each side of this the proximal 

 rim of the aperture is provided with a long, narrow, often crenulated or finely 

 denticulate hinge-tooth and the somewhat slightly chitinized operculum is pro- 

 vided with a muscular ridge within each lateral margin. Proximally to the aper- 

 ture there is as a rule a small, tubercle-like projection. A heterozooecium, which 

 is sometimes developed as a vibraculum and sometimes as an avicularium, may 

 occur on one or both sides, but is not rarely lacking on more or fewer of the 

 zocecia. The ooecia, which in rare cases seem to be endoocecial, consist of a cal- 

 cified endoooecium without pores and of a membranous ectoocecium. The distal 

 half of the zocecium is provided either with three long, multiporous pore-cham- 

 bers or with a larger number of single- or few-pored chambers placed close 

 together. 



To this genus belong the following species: S. (Schizoporella) spinifera Johnst., 

 S. (Schiz.) vulgaris Moll., E. (Schiz.) Alderi Busk. E. (Schiz.) simplex Johnst, E. 

 (Mastigophora) Dutertrei Aud., E. (Mast.) Hyndmanni Johnst. and E. (Mast.) pes 

 anseris Smitt. Possibly Schiz. longispinata Busk and Schiz. daedala Mac Gill, should 

 also be referred here. 



Escharina pes anseris Smitt. 



Hippothoa pes anseris Smitt, Kg!. Svenska Vetensk. Akad. Handl., 1873, Bd. 11, 



No. 4, p. 43, PI. VII, figs. 159—160. 



(PI. XVIII, flgs. 1 a-c). 



The zocecia broad, pentagonal or hexagonal, evenly arched, with numerous, 



small, densely placed pores, from the margin of which a number of fine points 



or rods radiate and these sometimes seem to form a connected network in the 



lumen of the pore. The pores may presumably become closed in time by this 



network, and according to Smitt's description the wall is without pores. The 



aperture is provided with a somewhat slightly arched distal margin, and the 



lateral margins which converge somewhat proximally form on each side a small, 



angularly pointed corner with the corresponding convex half of the proximal 



' 84, p. 109. 



