ART. 8 CEUSTACEANS FROM MEXICO EATHBUN" 7 



Calappa marmwata Latkeille, Hist. Nat. Crust., vol. 5, 1803, p. 392. Not 

 Cancer marmoratiis Fabricius, Mant. Insect., vol. 1, 1787, p. 319; nor 

 Herbst, Natur. Krabl)en u. Krebse, vol. 1, 1790, p. 261, pi. 20, fig. 114, 

 which is a PacJiygrapsus. 



Occurrence. — Cortez pump station, Tepetate, 200 meters N.E. of 

 S.W. slope of hill; altitude about 50 meters; Oligocene; Nov. 17, 

 1920; Coll. No. M 23 V; a piece of the major finger of a small 

 specimen. 



Genus CALAPPILIA A. Milne Edwards 



Calappilia A. Milne Edwards, in Bouille, Pal^ontologie de Biarritz et de 

 quelques autres localites des Basses-Pyren6es, Compte-rendu des travaux 

 du Congres Scientifique de France, session 39, Pan, 1873, p. 434 [8], 

 Genotype, C. verrucosa A. Milne Edwards. 



Carapace not extended over the ambulatory legs and without large 

 lateral spines. Front very narrow, having 2 small, slightly divergent 

 points, much like those of Calappa. 



CALAPPILIA HONDOENSIS, new species 



Plate 5, Figures 1 and 2 



Description. — Carapace exposed, margin incomplete ; broader than 

 long, very convex, especially in the antero-posterior direction. Lat- 

 eral margin strongly arched, and unarmed back to a small postero- 

 lateral tooth which does not project as far as the line of the lateral 

 margin or the hind margin ; the latter is obscure. The longitudinal 

 furrows separating the median area from the lateral are broad and 

 deep. Surface covered with tubercles unequal and well separated; 

 about 45 on the branchial region, 11 of which follow the margin ; on 

 the cardiac region an elongate median tubercle surrounded by 8 

 smaller ones regularly placed, and behind this pattern a single large 

 one; 2 small urogastric tubercles side by side; 2 largest of all are 

 median on the gastric region, in front of them an arc of 4, and in 

 addition several smaller ones. The anterior border of the carapace 

 is absent ; on the right side, however, one gets a hint of the position 

 of the orbit. A narrow strip visible below the side margin of the 

 carapace is finely granulate. 



Measurements. — Greatest width of carapace 18.7, width at postero- 

 lateral tooth 14.8, approximate height 6.2 mm. 



Occurrence. — Lower California: In Arroyo Hondo, 1 km. above 

 junction with Arroyo Conejo; upper sandstone of Tepetate forma- 

 tion, Upper Eocene; December 2, 1920; Coll. No. 9695; Cat. No. 

 371094, U. S. N. M. 



Relation. — This species in the quality of its ornamentation has a 

 strong resemblance to the type species of the genus, C. verrucosa^ 



«A. Milne Edwards, C. R. trav. CongrSs Sci. Prance, session 39, Pau, 1873, pi. 4, fig. 3. 



