NO. 3 CASSIDULOID ECHINOIDS — KIER 207 



Apical system. — Anterior, monobasal, madreporic pores over all 

 central region. 



Ambulacra. — Petals well developed, very wide, interporiferous 

 zones over twice width poriferous zones, petals closing distally; 

 petals II, III, IV extending almost to margin, petals V, I two-thirds 

 distance to margin, longer than other petals ; pores strongly conjugate, 

 inner pore round, outer slightly elongate transversely, joined by deep 

 conjugation groove. 



Periproct. — Marginal, flush with test, higher than wide. 



Peristome. — Regular, anterior pentagonal, flush with test, with 

 high wall-like rim surrounding opening. 



Floscelle. — Bourrelets well developed, vertical sided. Phyllodes 

 (text fig. 1 70) slightly developed with only slight increase in width 

 of ambulacra near peristome, and slight crowding of pores ; approxi- 

 mately three pores occluded in each phyllode; buccal pores present. 



Tuherciilation. — Adorally tubercles only slightly larger than adap- 

 ically ; naked, finely pitted medial area adorally in interambulacrum 5. 



Occurrence of type species. — Eocene, San Giovanni, Vicentin. 



Location of type specimen. — Not known. 



Remarks. — Dames' (1878, pi. 5, fig. 2d) figure of the peristome 

 is diagrammatic and in part erroneous. I was able to study Dames' 

 figured specimen and include an enlarged photograph (pi. 39, fig. 7) 

 of its peristome. The two large tubercles that Dames shows in each 

 ambulacrum at the peristome are not present, and the peristome is 

 deep, with well-developed bourrelets, not shallow and without bour- 

 relets as stated by Dames. 



Genus GITOLAMPAS Gauthier 



Gitolampas Gauthier, 1889a. £ch. foss., Tunisie, pp. 98-99. Type species by 



monotypy, Pliolampas tunetana Gauthier. 

 Synonyms: Bothriolampas Gauthier; Echanthus Cooke; Gitolampopsis Checchia- 



Rispoli. 



GENERIC DESCRIPTION 



Medium size, elongate, often with pointed posterior extremity, 

 greatest width posterior to center, rounded margin ; apical system 

 monobasal, anterior, four genital pores ; petals well developed, broad, 

 closing distally, with broad interporiferous zones, poriferous zones 

 of same petal of same length, pores conjugate, outer pore elongate 

 but not slitlike, ambulacral plates beyond petals single pored; peri- 

 proct marginal, slightly visible from above or below, longitudinal; 



