84 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



De Loriol (1873, pi. 16, fig. 2) in the De Loriol Collection at the 

 Museum d'Histoire Naturelle, Geneve, Switzerland), P. subinferus 

 (Desor) (text fig. 69). It is interesting to note how similar to each 

 other are the phyllodes of these different species. 



Photographs of the adoral surface of P. minor and P. cylindricus, 

 are on plate 12. Lambert's Astrolampas romani should be referred to 

 Pgorhynchus as discussed on page 52. 



Szorenyi (1955a) has described many species which she refers to 

 Botriopygus, from the Senonian of Bakony. Unfortunately, she does 

 not include drawings of the phyllodes, but from the Senonian age 

 of her species, it is probable that they have single-pored phyllodes 

 and should be referred to Parapygiis. 



Range and distribution. — Cretaceous (Neocomian to Albian) of 

 Europe, North Africa, and the Americas. 



DESCRIPTION OF TYPE SPECIES 



PYGORHYNCHUS OBOVATUS (L. Agassiz) 



Plate 12, figures 1-5; text figure 70 

 Catopygus obovatus L. Agassiz, 1836a. Mem. Soc. Sci. Nat. Neuchatel, vol. i, 

 p. 136. 



Material. — The type specimens were believed lost according to 

 Lambert and Jeannet (1928, p. 164), but I found them in the echi- 

 noid collections in the Museum of Comparative Zoology, Harvard. 

 They are from the type locality, Mormont pres La Sarraz, and were 

 collected by L. Coulon. One of the specimens (herein designated 

 the lectotype) is the specimen figured by Agassiz (1839, P^- 8» ^S^. 

 18-20). This figure is greatly restored, showing many details not 

 visible on the specimen. Besides the type material, I have studied 

 specimens in the Lambert Collection at the Sorbonne, Paris, at the 

 d'Orbigny Collection at the Museum National d'Histoire Naturelle, 

 Paris, and material in the U. S. National Museum. 



Shape. — Large (holotype 54 mm. long), low, greatest width pos- 

 terior, anterior margin blunt, posterior pointed ; depressed around 

 peristome. 



Apical system. — Anterior, madreporite large, extending posteriorly 

 between posterior genital plates; four genital pores. 



Ambulacra. — Well-developed petals extending almost to margin, 

 with tendency to close distally, interporiferous zones wide, at maxi- 

 mum nearly twice width of poriferous zones, poriferous zones nar- 

 row, pores conjugate, outer pores of pore pairs slitlike, inner slightly 

 elongated longitudinally. 



