236 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.84 



Genus LOVENIA Desor 



LOVENIA DUMBLEI Kew 



Lovenia dumblei Kew, Proc. California Acad. Sci., ser. 4, vol. 7, p. 136, pi. 17, 

 figs. 2a-c, 1917. — IsRAELSKY, Proc. California Acad. Sci., ser. 4, vol. 13, p. 

 145, 1924. 



The genus Lovenia is not recorded by Clark and Twitchell as occur- 

 ring in the United States, and so far as known it is thus far found in 

 America only in ^Mexico. Lambert {op. cit.) describes as a new species 

 Vasconaster jeanneii from near Tiixpan, Mexico. This type is nearly 

 allied to Lovenia. 



A number of fine specimens of L. dumblei occur in the collection from 

 several localities of Oligocene age in Mexico: 



Transcontinental Railroad, a little east of Km 5, lot 214 Hacienda 

 Chinampa, 10 km east of the town of Chinampa, Canton Tuxpan, 

 Veracruz, from main Lepidocyclina gigas bed, Mes6n formation, col- 

 lected by Vaughan, Weaver, and Semmes, 1920, three specimens, no. 

 M,30V; another specimen was collected from the same locality b}^ the 

 same geologists but just above the Lepidocyclina gigas bed, no. M.29V; 

 station 49, Transcontinental Railroad, east of construction camp, 

 Mes6n formation just below large Lepidocyclina bed, D. R. Semmes, 

 collector, one specimen, no. 57. Vaughan and Semmes collected from 

 the Eocene, probably the Tantoyuca formation, on Arroyo Zarco, 

 south side of Peregrina Hill, Hacienda Tamemaz, 9 km southeast of 

 the town of Tempoal, Veracruz, north of road from El Cristo to Dos 

 Caminos, Mexico, from just above the Venericardia bed (M.1106 V), 

 several fragments of a species of Lovenia that resemble L. dumblei 

 Kew. 



LOVENIA MEXICAN A, new species 



Plate 15, Figures 2, 3 



Test low, cordiform, elongate, truncate anteriorly with a moderately 

 deep anterior furrow, ovately elongate posteriorly. Nearly fiat 

 dorsally, flattened and moderately reentrant about the peristome 

 ventrally. Anterior ambulacrum III narrow, inconspicuous in the 

 moderately deep anterior furrow. Paired ambulacra slightly sunken 

 dorsally, wide, triangular near the apical disk; they narrow toward the 

 ambitus. Interambulacra broad, rounded, bearing dorsally rather 

 small perforate primary tubercles, widely spaced, with secondary 

 and miliary tubercles. There are a number of primary tubercles on 

 the posterior interambulacrum 5, as well as on the other four inter- 

 ambulacral areas. Ventrally the primary tubercles are more crowded. 

 Neither the internal fasciole nor the subanal fasciole could be made 

 out in either specimen, though these characters are quite clear in 

 some of the specimens of L. dumblei. In L. mexicana the apical disk 



