NO. 3 CASSIDULOID ECHINOIDS — KIER II3 



Oeidolampas Lambert, 1918. Mem. Soc. Acad. Aube, ser. 3, vol. 55, p. 44. Type 

 species by original designation, Echinolampas ataxcnsis Cotteau. 



Palaeolampas Bell, 1880. Proc. Zool. Soc. London, vol. 18, p. 43. Type species 

 by monotypy, Palaeolampas crassa Bell. A photograph of the adapical surface 

 and floscelle (pi. 31, figs. 3, 4) and a drawing of a phyllode (text figure 92) 

 are included. 



Planilampas Mortensen, 1948. Monogr. Ech., vol. 4, pt. i, p. 297. Type species 

 by original designation, Echinolampas sternopetala Agassiz and Clark. 



PoUtolampas Lambert, 1918. Mem. Soc. Acad. Aube, sen 3, vol. 55, p. 45. Type 

 species by original designation, Clypeastcr politus Lamarck. 



Progonolampas Bittner, 1892. Sitzungsb. Kais. Akad. Wiss., Math.-Nat. Classe, 

 vol. loi, Bd. 3, p. 357, Type species by original designation, Progonolampas 

 Hovae-hollandiae Bittner, 1892 {=Echinolampas posterocrassus Gregory, 

 1890). 



DESCRIPTION OF TYPE SPECIES 



ECHINOLAMPAS POSTEROCRASSUS Gregory 



Plate 32, figures 5-7 ; text figure 96 



Echinolampas posterocrassus Gregory, 1890. Geol. Mag., n.s., dec. 3, vol. 7, 

 No. II, p. 483, pi. 13, figs. 4-6. 



Material. — Four specimens studied from the U. S. National Mu- 

 seum collections. 



Shape. — Medium size, oval, pointed posterior extremity, inflated 

 adapical surface, rounded adoral surface with depressed peristome, 

 inflated interambulacrum 5 ; greatest width and height posterior to 

 center. 



Apical system. — Anterior monobasal, with large, slightly inflated 

 madreporite. 



Ambulacra. — Petals slightly developed, poriferous zones of un- 

 equal length with approximately 4 more pore pairs in right poriferous 

 zone than in left in petal III, 8 to 10 more in posterior zones of 

 petals II and IV, and 10 in outer poriferous zones of petals II and 

 V ; pores conjugate, outer pore slightly elongated transversely, inner 

 pore round. 



Periproct. — Inframarginal, transverse, adoral side of opening 

 slightly depressed. 



Peristome. — Anterior, very depressed, pentagonal. 



Floscelle. — Bourrelets slightly developed, phyllodes single pored 

 (text fig. 96) slightly developed, with eight pores in each outer series, 

 two in each inner, little crowding of pores ; buccal pores present. 



Occurrence. — Upper Eocene of South Australia. 



Location of type specimen. — British Museum (Natural History). 



