244 PEOr. p. M. DITNCA]^- S EETISION OF THE 



Anterior ambulacrum in a stallow groove; the paired ambulacra 

 shallow, lanceolate, moderately long ; pores somewhat diminislied 

 near the apex. Odd interradium separated, actinally, from the 

 labrum by the junction of the broad posterior ambulacra! areas. 



Peristome excentric in front, semilunar ; sternum nipped in 

 greatly posteriorly. Periproct high up in the posterior truncation. 



A large subanal fasciole, with at least eight pairs of ambu- 

 lacral plates and pores included. Large sunken primary tubercles 

 and granules, tlie former absent in the posterior interradium. A 

 peripetalous fasciole limiting and bounding the tubercular areas. 



Fossil. Tertiary : Madura, Java. 



The genus is remarkable on account of the unusual number of 

 ambulacral plates implicated in the subanal fasciole and for the 

 junction of the ambulacra actinally, so as to separate the sternum 

 from the peristome. 



G-enus Teoschelta, Duncan Sj- Sladen, 1883, Pal. Ind. ser. xiv., 

 Monogr. Tert. Echin. Kachh and Kattywar, p. 67, pi. vii. 

 figs. 9-12, and pi. xi. fig. 5. 



Test rather large, long, oval, high, notched anteriorly, trun- 

 cated posteriorly, slightly convex actinally. 



Apical system slightly excentric in front; four perforated 

 basal plates, the raadreporite in the right anterior, and passing 

 centrally, separating the postero-lateral basals and the posterior 

 radials also, extending into the posterior interradium. 



Ambulacra all in deep grooves ; pores small and elongate in 

 the anterior ambulacrum ; large, except close to the apical system 

 where they are minute, in the other ambulacra ; petals open at 

 the extremity close to the fasciole. 



Peristome slightly excentric in front, broader than long, 

 posterior lip well developed. Actinal plastron narrow. Periproct 

 supramarginal, in the truncation. 



Interradia with large sunken tubercles except in the posterior 

 interradium. A peripetalous and a subanal fasciole. 



Fossil. Miocene : Kachh. 



Agassiz and Desor defined the genus Plagionot its in 1847, a name 

 unfortunately preoccupied in the classification of the Insecta. 

 G-ray, in the Catal. Eecent Ech. Brit. Mus. pt. i. 1855 (not 

 1832 as Dames writes), p. 50, admitted the name and separated 



