NO. 3 CASSIDULOID ECHINOIDS — KIER 41 



B. lorioli are included on plate 9, figure 5, 6. Both species were 

 collected at the same locality, and it appears that Fourtau referred 

 the smaller specimens to one species and the larger to another. 



Synonym of BOTHRYOPNEUSTES 



Clypcobrissus Currie, 1925. Monogr. Geol. Dept. Hunterian Mus., Glasgow 

 Univ., pp. 69-70. Type species by original designation, Clypeobrissus sotnali- 

 ensis Currie. 



Remarks. — Currie was unaware of Fourtau's Bothryopneustes 

 when she erected a new genus for her species Clypcobrissus soniali- 

 ensis. Fourtau's paper had just come out shortly before hers. Later 

 (1927, p. 425), she considered her species congeneric with B. lam- 

 berti, and Clypeobrissus a synonym of Bothryopneustes. I have 

 studied the type specimen of B. lamberti and paratypes of B. somali- 

 ensis and agree that they are congeneric. Currie's description is very 

 thorough, and no redescription is necessary here, but photographs 

 (pi. 9, figs. 7-10) are included. 



Maccagno (1947, p. 129) considered B. somaliensis a synonym of 

 B. orientalis Fourtau. I have studied a specimen of B. oricntalis, 

 and its test is much more elongate than in B. somaliensis. I include 

 photographs of this specimen on plate 9, figures 11, 12. 



Genus PYGURUS Agassiz 



Pygurus L. Agassiz, 1839. fich. foss. Suisse, vol. I, p. 68. Type species by 

 subsequent designation, Savin, 1902, p. 271, Echinolampas montmollini Agassiz. 

 Synonym: Echinopygus d'Orbigny. 



GENERIC DESCRIPTION 



Large, often flattened, in some species width greater than length, 

 in others less than length, posterior margin prolonged in some species, 

 greatest height at apical system; apical system tetrabasal, posterior 

 genital plates separated by genital 2, posterior oculars usually in con- 

 tact, four genital pores; petals broad, equal, or with petal III shorter 

 than others, open or with tendency to close, with wide interporiferous 

 zones, wide tapering poriferous zones with conjugate pores, outer 

 pore slitlike, all ambulacral plates double pored; periproct infra- 

 marginal, longitudinal or transverse ; peristome anterior, pentagonal, 

 width greater than or less than height ; bourrelets well developed, 

 phyllodes slightly widened, or very broad, double pored, with from 

 one to three series of pore pairs in each half -ambulacrum ; no buccal 

 pores. 



