80 PROF. P. M. Duncan's keyision of the 



Grenus Codechintis, Desor, 1858, Synopsis, p. 111. Cotteau, Pal. 

 Frang., Terr. Oret. vol. vii. pi. 1198. fig, 6. 



Test small, tumid, spheroidal, flattish actiuallj. Coronal plates 

 high. 



Ambulacra broad; poriferous zones broad; pairs of pores 

 triserial, close, in nearly horizontal triplets : plates compound, 

 low, some of three low primaries, " diadematoid " ; others with 

 a large middle primary, alow aboral demi-plate, which is broad, 

 and an adoral demi-plate which is excluded from the interradial 

 suture. The middle pair of pores is nearest the interradium. 

 Tubercles very small, plain, distributed irregularly, most nume- 

 rous and closest actinally, but few elsewhere. 



Interradia with the median sutural area rather depressed ; 

 tubercles resembling those of the ambulacra, limited to parts of 

 plates remote from the median line of the area, wliich is naked. 

 A minute granulation separating the tubercles of both areas. 

 Peristome s snail, central, diagonal. 



Fossil. Cretaceous : Europe, N. Africa. 



IV. Subfamily Ortliopsince (p. 59) . 



Grenus Oethopsis, Cotteau, 1863, Pal. Franc., Terr. CrH. vol. vi. 

 p. 550. Stoliczka, 1873, Pal. Lid., Cret. Fauna 8. India, 

 vol. iv. 8. viii. ser. 3, Fchin. p. 45, pi. vii. De Loriol, 

 1887, Faxme Cret. du Port., Eck. fasc. i. p. 46, pi. viii. 



Test moderate in size or small, depressed, circular or slightly 

 pentagonal in ambital outline, tumid dorsally, flat actinally. 



Apical system with five perforated basals ; madreporite well 

 developed; radial plates, all or some entering the anal ring, 

 which is variable in outline. 



Ambulacra much narrower than the interradia, straight; pairs 

 of pores numerous, in straight series ; poriferous zone narrow ; 

 plates simple, low, primaries dorsally, but near the ambitus and 

 actinally two primaries may combine, and the suture passes 

 transversely through the interporiferous tubercle. Tubercles 

 of the ambulacra small, perforate, and smooth; two vertical 

 rows. 



Interradia with several vertical rows of small primaries re- 

 sembling those of the ambulacra, or slightly larger, some reaching 

 up dorsally. 



Peristome moderate, with well-developed branchial incisions; 



