54 PEOF. p. M. DUNCAiyr's EEVISION OP THE 



Interradia broad, with few plates and two rows of large primary 

 tubercles, perforate, non-crenulate and distant, with projecting 

 scrobicules. 



Peristome large, siibdecagonal, and with large branchial in- 

 cisions. Periproct subcircular. Spines large and glandiform. 



Fossil. Europe : Jurassic formation. 



Cotteau places the genus close to JSemipedina ; but it appears 

 to be nearer Semicidaris. 



Genus GtLTPTICFS, Agassiz, 1840, EcTi. Foss. de la Suisse, pt. ii. 

 p. 95. Desor, 1858, Synopsis, p. 95. Cotteau, 1880-85, Pal. 

 Fran^., EcJi. Terr. Jura, pi. 418. 



Test moderate in size, thick, subhemispherical, flat actinally. 



Apical system large, slightly raised, the basals in contact, stout, 

 sculptured ; the sutures depressed, pitted more or less ; the radial 

 plates large, between the outer part of basals as broad as they 

 are, pentagonal, broad and re-enteringly curved adorally. Peri- 

 proct elliptical, or pentagonal with a raised rim, small. 



Ambulacra straight, narrow, except at the peristome, where 

 the poriferous zones are expanded. Poriferous zones straight, 

 narrow, sunken ; pairs in compound plates usually triplets, poly- 

 serial at the peristome ; two vertical rows of small, smooth, 

 primary tubercles, the mamelons confounded with the bosses, im- 

 perforate and non-crenulate, pass to the apex from the peristome, 

 close to the poriferous zones ; or the tubercles may be replaced 

 above the ambitus by elongate smooth elevations of the plates 

 placed irregularly or not. Epistroma much developed. 



Interradia with large primaries resembling those of the ambu- 

 lacra at the ambitus and actinally, but with warty or irregularly 

 elongate elevations, with or without secondary tubercles, abacti- 

 nally ; granules and secondary tubercles exist. 



Peristome large, decagonal, often deformed and longer in the 

 antero-posterior direction than across, the branchial incisions 

 well developed, and a notch at the ambulacral median line also. 



Fossil. Oolite : England, Europe, and N. Africa. 



