;{26 



Escharina ' Gray, char, emend. 

 Sfhizoporella Hincks p. p., Masligophora Hincks p. p. 



The zoivcia, 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 olT, fairly deej) sinus, (he breadth of which is at least one- 

 third of the breadth of the whole aperture. On each side of this the i)ro.\imal 

 rim of the aperture is j)rovided 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 helerozoa'cium, which 

 is sometimes developed as a inhraciihiin and sometimes as an ainctilariiiin, may 

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

 zooecia. The oa-cia, which in rare cases seem to be endoooecial, consist of a cal- 

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

 half of the zooecium is piovided 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.) inih/aris Moll., E. (Schiz.) Alderi Busk. E. (Schiz.) simplex Johnst., E. 



(Masti(jophor(i) Diitertrei Aud., E. (Mast.) Hiindmanni Johnst. and E. (Mast.) i>es 



anseris Smitl. Possibly Schiz. loiKji.spiiiala Busk and Schiz. dncdala Mac Gill, should 



also be referred here. 



Escharina pes anseris Smitl. 



Hippothoa pes anseris Smitt, Kgl. Svenska Vetensk. Akad. Handl., 1873, \^^\. 11, 



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



(1^1. XVIII, figs. 1 a-c). 



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

 small, densely placed pores, from the margin of which a nund)er of fine points 

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

 lumen of the pore. The pores may presumably become closed in lime 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. 



