I06 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



III right poriferous zone with 3 or 4 more pore pairs than left; in 

 petals V and I outer poriferous zones with 9 more pore pairs than 

 inner poriferous zones. 



Periproct. — Marginal, longitudinal, in slight groove. 



Peristome. — Anterior, subpentagonal. 



Floscelle. — Bourrelets slightly developed. Phyllodes (text fig. 87) 

 broadened, single pored, with few pores : six or seven in each outer 

 series, two in each inner series of a half -ambulacrum. Buccal pores 

 present. 



Occurrence. — Cretaceous (Cenomanian), M ant ellic eras mantelli 

 (Sowerby) zone; near Fumel, Aquitaine, France. 



Location of type specimen. — Holotypc in Lambert Collection, 

 Sorbonne, Paris. 



Genus ECHINOLAMPAS Gray 



Echinolampas Gray, 1825. Ann. Philos., vol. 26, p. 429. Type species by subse- 

 quent designation, Pomel (1883, p. 62), Echinus oviformis Gmelin. 



Synonyms: ? Aplolampas Lambert; Craterolampas Cotteau; Cylindrolampas 

 Lambert; Cypholampas Lambert; Euechinolampas Pomel; Heteroclypeus 

 Cotteau ; Hypsoclypus Pomel ; Hypsoheteroclypcus Szorenyi ; Isolampas Lam- 

 bert; Libyolampas Lambert; Macrolainpas Lambert; Merolampas Pomel; 

 Miolampas Pomel; Oeidolampas Lambert; Palaeolampas Bell; Planilampas 

 Mortensen; Politolampas Lambert; Progonolampas Bittner; Psammolampas 

 Lambert; Scutolampas Lambert; Sphclatus Pomel. 



GENERIC DESCRIPTION 



Medium to large forms, often with high test, elongate to circular, 

 apical system monobasal, petals moderately developed, sometimes 

 lanceolate, open, or closing distally, poriferous zones usually unequal, 

 interporiferous zones wide, single pores in ambulacral plates beyond 

 petals; periproct inframarginal, transverse, peristome transverse, 

 pentagonal ; bourrelets well developed ; phyllodes single pored, usually 

 moderately developed, with from two to three series of pores in each 

 half -ambulacrum; buccal pores present; tubercles adorally same size 

 as adapically; usually narrow naked granular zone in interambula- 

 crum 5. 



Comparison with other genera. — Echinolampas differs from Plesio- 

 lampas in having a transverse instead of longitudinal periproct, and 

 from Parapygus by having less developed petals with narrower 

 poriferous zones, and usually a larger, wider test. It differs from 

 Rhyncholampas in having an inframarginal periproct, narrower petals, 

 and a less developed floscelle. 



