194 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I44 



is no question that Pliolampas pioti is congeneric with Pliolampas 

 ganthieri. Both species have similar shape, broad, equal petals with 

 broad poriferous zones, longitudinal pentagonal peristomes, and 

 strikingly similar phyllodes, broad, with five to six pores in the outer 

 series, one or two in the inner ia each half -ambulacrum. As P. pioti 

 has never been well figured, I include photographs on plate 36, 

 figures 4-7, and a drawing of a phyllode in text figure 163. 



Mortensen (1948, p. 249) states that all species similar to Plio- 

 lampas having four genital pores should be referred to Breynella 

 Gregory ; restricting the three-pored species to Pliolampas. However, 

 the type species of Breynella, Pliolampas vassalli (Wright), has only 

 three genital pores. B. vassalli is very similar to P. pioti, and Brey- 

 nella is considered, herein, a synonym of Pliolampas. 



Lambert and Thiery (1921, p. 371) state that a granular sternal 

 zone is a character of Pliolampas. However, this zone is not developed 

 in the lectotype of the type species. 



Range and distribution. — Eocene to Pliocene of the circum-Medi- 

 terranean countries and the Malay Archipelago. 



DESCRIPTION OF TYPE SPECIES 

 PLIOLAMPAS GAUTHIERI (Cotteau) 



Plate 2>^, figures 1-3; text figure 162 

 Echinolampas gauthieri Cotteau, 1880 (reference not seen). 



Material. — There are two specimens of this species in the Latnbert 

 Collection. One of these, the lectotype, was figured by Cotteau in 

 his original description and designated as "type" by Lambert (1913, 

 p. 131). The other specimen is from the same locality but was not 

 figured. 



Shape. — Medium size, elongate, with pointed posterior margin, 

 slightly inflated with greatest height anterior at apical system, de- 

 pressed posteriorly ; adorally depressed around peristome. 



Apical system. — Anterior, monobasal, genital pores small, number 

 of pores not certain. 



Ambulacra. — Petals, similar, broad, open, interporiferous zones 

 narrow; poriferous zones very wide, widening distally, pores deeply 

 conjugate. 



Periproct. — Inframarginal, transverse. 



Peristome. — Anterior, longitudinal (higher than wide), pentagonal, 

 depressed. 



Floscelle. — Bourrelets well developed, inflated; phyllodes broad, 



