^'0. 3 CASSIDULOID ECHINOIDS — KIER I3I 



toothlike, phyllodes single pored, broad, deeply depressed between 

 bourrelets. with pores arranged in two series (^text fig. 112) in each 

 hal f -ambulacrum : outer series arclike with approximately 10 pores. 

 inner series linear with 3 pores: buccal pores and phyllodal pores 

 widely separated from edge of peristome. 



Occurrence. — Upper Cretaceous (^Campanian) probably from the 

 Peedee formation. South Carolina. 



Location of type specimen. — Holotypo (Xo. 0540"! in the Museum 

 of Comparative Zoolog}-, Har\-ard. 



Remarks. — The peristome region (pi. Jo. fig. 3) in the holot\-j->e 

 is misshapen near the posterior ambulacrum, and the phyllode in 

 ambulacrum I is absent. This distortion is not due to poor preserva- 

 tion but is a pathological abnormaiitv. 



GONGROCHANUS Kier, new name 



pro Cyrtonkt M'Clelland. 1S40. Calcutta Journ. Xat. Hist., vol. i. No. 2. p. 185: 

 non Cyrtoma !Meigen. 1SJ4, a dipter. T\-pe species, Cxrlaitta hcrsch^liatM 

 M'Gelland. 



GENERIC DESCRIPTIOX 



Large, broad, adapical surface highly inflated with posterior region 

 obliquely truncated ; adoral surface flat to slightly depressed : apical 

 system tetrabasal. three genital pores in the type species ; petals 

 broad, approximately equal, in t}-pe species petal III is slightly longer 

 than the others : interporiferous zones broad, tapering distally. pore 

 pairs conjugate, outer pore slitlike, inner round to slightly elongated 

 transversely, ambulacral plates beyond petals single pored : periproct 

 supramarginal. longitudinal, in notch with groove extending ventrally 

 to margin : peristome central, wider than high : bourrelets strongly 

 developed, jtitting into peristome, toothlike ; phyllodes very broad, 

 single pored, with many ^xires arranged in each half -ambulacrum 

 in two regular series with many pores irregularly scattered between 

 these two series : prominent bulge occurring in median area of each 

 ambulacrum ; buccal pores near edge of peristome. 



Co})tparison -ti-'itJi other genera. — This genus is very similar to Stiij- 

 matopygus. Both Lambert and Thiery (,19-1. p. 304) and Mortensen 

 (194S. p. 217) considered it a s>nionym of the latter. It is similar 

 in its general shape, petal arrangement, and i^K^sition of periproct. 

 but its floscelle is sufficiently different to warrant generic distinction. 

 In the phvllodes in Gongrochanus liersclielianits there are almost 70 

 pores in a half-ambulacrum, arranged in two regular series with 



