SYSTEMATIC DESCRIPTIONS — CLYPEASTRINA. 31 



The specimen measures 3.5 mm. in height, 10.5 mm. in length 

 through ambulacrum III and interambulacrum 5, and 10 mm. in 

 width. The genital pores were made out above the interambulacra 

 2,3, and 4, but did not show in area 1, where one doubtless existed. The 

 genital pore is absent in area 5 as a typical character. The ambulacral 

 pores on the ventral side are indicated in Cotteau's figure 7, but he 

 states in the text that they are invisible on the lower side, and I could 

 not perceive any trace of them. This species is easily distinguished 

 from antillarum by its more elevated test and open petals. 



Oligocene, Anguilla formation, island of Anguilla, Guppy collection 

 ex Cleve, 1 specimen, the holotype, U. S. Nat. Mus. No. 1 1542 1 . Antigua 

 formation, Willoughby Bay, Antigua, A. P. Brown collector, 1913, 

 2 specimens, Philadelphia Acad. Nat. Sci. No. 1662. 



Family CLYPEASTRID^ A. Agassiz, 1873. 

 Genus ANOMALANTHUS Bell, 1884. 

 Anomalanthus Bell, 1884, Proc. Zool. Soc. London, p. 43, plates 2, 3. 



Type species. — Echinanthus tumidus Tenison- Woods, 1878, Proc. 

 Linn. Soc. N. S. W., vol. 2, p. 169. 



This genus, Anomalanthus, is based on a Recent species from Aus- 

 tralia, but of somewhat doubtful locality. This Recent species with 

 the following are the only species so far attributed to the genus. 



Anomalanthus gregoryi Lambert. 



Anomalanthus gregoryi Lambert, 1915, Mem. Soc. d'Agric. de l'Aube (Troyes), vol. 79, p. 

 27, plate [unnumbered], figs. 1, 2. 



The following is a description of this species : 



Test large, ovoid, subhemispherical, 177 mm. in length, 101 mm. in 

 width, and 57 mm. in height. Apical disk slightly anterior. Ambulacral 

 petals very long, widely flaring, ventrally moderately concave, peristome 

 inframarginal. 



As the petals, though very flaring, curve in slightly at the distal 

 ends in A. gregoryi, also as the periproct is inframarginal, it is doubtful 

 if the species should be referred to Anomalanthus. In the type of 

 that genus the petals are flaring and straight throughout and the peri- 

 proct is marginal, both of which characters distinguish Anomalanthus 

 from Clypeaster. While gregoryi is very close to Anomalanthus, it 

 seems to have characters of both the allied genera. 



"Miocene," Antigua. Lambert says that the matrix differs from that 

 of other "Miocene'' [Oligocene] Echini of Antigua and indicates a 

 different bed, J. W. Gregory collector, 1899, collection of British 

 Museum. 



