194 PEOF. P. M. Duncan's revision op the 



rudimentary floseelle. Periproct moderately large, inframarginal, 

 elongate oval, placed longitudinally. 



I'ossil. 'Eocene : Asia (Sind). Vrdhablj Palceo^neustes conicus, 

 Dames, 1877, of the Yicentin Eocene, belongs here. 



Subgenus Oeiolampas, Munier-Chalmas, 1882 (genus), Bull. 

 Soc. Geol. de France, ser. 3, vol. x. p. 386. Cotteau (genus), 

 1887, Pal. Frang., EcJi. irreg. Terr. Foc^ne, p. 499, 



Flesiolampas with crenulate and perforate tubercles. 



Fossil. Eocene: Europe. 



Genus PALiEOLAMPis, J. Bell, 1880, Proc. Zool. Soc. p. 43. 



Syn. Clypeolampas, Pomel *. 



Test moderate, thick, irregularly ovoid in tumid marginal out- 

 line, subcorneal and depressed dorsally, rather flat at the slightly 

 precentral apex, slightly tumid actinally. 



Apical system with four basal plates fused and the large 

 madreporite central, four pores ; radial plates small, and the 

 pores variable in size. 



Ambulacra rather broad, open, the pores remaining paired as 

 far as the ambitus, the outer row of pores of each series of pairs 

 continued over the ambitus to the peristome; a tendency to 

 shortening of one of the paired poriferous zones only slightly 

 indicated in the antero -lateral ambulacra. Ambulacra widest at 

 the end of the double series of pores. 



Interradia large, closely ornamented, and the interporiferous 

 areas also with similar small primary tubercles. 



* M. Pomel does not give any references in his work, Theses, 1883, p. 65, 

 and in the instance of his genus Clypeolampas merely states : — " Clypeolampas, 

 Pomel, 1868 {Phylloclypeus, De Loriol, 1880)." Search has been made in vain 

 for any such genus published in 1868 by M. Pomel, and it is necessary there- 

 fore to take the diagnosis given in the page just mentioned. Careful study of 

 this diagnosis proves that it will include many Echinolampads, Gonolampas 

 (Pomel, as well as the different genus of A. Agassiz), Hypsoclypeus, Pomel, 

 Flesiolampas, Pomel {non Duncan and Sladen), and PalcBolampas, Bell. Its 

 author was not aware of its being an edentate genus, because that was made out 

 for all forms with phyllodes by De Loriol, and therefore this insufficiently- 

 defined genus does not include Phylloclypeus, De Loriol. 



M. Cotteau has lately published Clypeolarnpas Lesteli, Cott. 1887, Bull. Soc. 

 G6ol. de France, ser. 3, vol. xv. p. 662. Humbert's drawings of it show that it 

 is a PalcBolampas, Bell, with larger primary tubercles in the abactinal plates. 

 The genus cannot stand. 



