aENEEA AND GROUPS OF THE ECHINOIDEA.. 163 



Subgenus Asteicltpeus, Verrill, 1867 (genus), Notes on 

 Radiata, p. 311. A. Agassiz, 1873, Revision, p. 538. 



Sjn. Cmstulum, TrosclieL 



Test large, stout, depressed, circular in front, truncated poste- 

 riorly. Petals slightly unequal ; poriferous zones broadest at 

 the distal ends of the petals. Lunules long, narrow, the anterior 

 the longest, all ambulacral; the interradial lunule wanting. 

 The calcareous pillars separating the jaws from the intestinal 

 region absent. Remaining internal structure as in Mellita. 



Jaws flat, pitted inferiorly for the articulating processes of the 

 girdle ; teeth superior, short. 



Recent. China and Japan. 



Genus Lekita, Desor, 1847, Catal. Rais. p. 84 ; 1858, Synopsis, 

 p. 222. E. Mrhes, 1852, Quart. Journ. Geol. Soc. p. 342. 



Test elongate, elliptical, depressed, only slightly tumid dorsally. 

 Apical system with four genital pores. 



Ambulacra with open petals ; the pores barely conjugate. 



Peristome circular, central. Periproct supramarginal. A 

 broad, smooth antero-posterior actinal zone along the median 

 Hue, flanked by large tubercles. Pillars and septa absent within. 



Fossil. Eocene : Europe. 



The next genus is of very doubtful value. 



Genus Moetonia, Desor, 1857, Synopsis, p. 231. 



Test moderate in size, circular in outline, with a swollen edge. 



Apical system with five genital pores. Ambulacral petals 

 open. 



Peristome central, and the periproct between it and the pos- 

 terior margin of the test. Ambulacral grooves actinaUy dichoto- 

 mizing and branching. 



Fossil. Eocene : Alabama, N. America. 



Genus Eotula, Klein, 1734, ]Vat. Disp. EcJi. p. 31, pi. 22 (ed. 

 Paris, 1754, p. 94). Agassiz, 184il, Monogr. d'Uch. viv.etfoss. 

 livr. 2, Les Scutelles, p. 23. Gray, 1855, Cat. Rec. Fch. Brit. 

 Mus, pt. i. p. 16. A. Agassiz, 1873, Revision, p. 540. Loven, 

 Etudes, 1874, pp. 33, 83, pi. 46. fig. 238. 

 Test moderate and small, very flat, circular anteriorly, with 



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