6 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 78 



Occurrence. — Villagran, Tamaiilipas, on Rio Santa Lucia; in 

 shale; upper Cretaceous series; November 8, 1920; Coll. No. M 10 V. 



Relation. — Compare P. domingensis Rathbun, Haiti, lower 

 Miocene.® 



Family CALAPPIDAE 



CALAPPA ZURCHERI Bouvier 



Plate 4, Figure 3 ; Plate 5, Figure 3 



Calappa zurclicri Bouvier, Bull. Mus. Hist. Nat., Paris, vol. 5, 1899, p. 189, 

 text-fig. ; Panama, Miocene. 



Description. — Carapace narrow and high; at the summit is one 

 of the largest tubercles; behind it are 3 median tubercles, the jfirst 

 and third of which are of medium size, the second very small; in 

 front of the large median tubercle and on either side is a large 

 gastric tubercle; from each of these an irregular row of 6 unequal 

 tubercles extends to the postero-lateral angle of the carapace. Be- 

 tween this and the median row there is a curved row of 6 directed 

 from the inner branchial angle toward the tooth on the postero- 

 lateral margin; the second tubercle is larger than the others. On 

 the antero-lateral slope are 8 tubercles in 3 vertical rows, and nearly 

 all of good size. There are several other small scattered tubercles. 

 The front part of the carapace is obscure, although the position of 

 the orbits can be made out (pi. 5, fig. 3). The posterior margin has 

 a small lobe either side of the middle; outside it begins the slightly 

 projecting wing, of which the first two or most posterior teeth are 

 lobiform, the next two subtriangular, dentiform, and projecting 

 laterally, the most anterior of all the most acute and marking the 

 widest point of the carapace. 



C. zurcheri is said to be widest at the third clypeal tooth, counting 

 from behind. This seems to be true of the left side of the figure 

 given by its author, the fourth tooth being broken off. A glance at 

 the right side shows the fourth tooth extending laterally beyond the 

 third. This is the case with the Mexican specimen, which there is 

 little doubt is conspecific with the Panamian. 



Measurements. — Approximate length of carapace 31, width 42.4 mm. 



Occurrence. — Transcontinental R. R. east of Los Naranjos; third 

 horizon below Lepidocyclina gigas; Oligocene; November 18, 1920; 

 Coll. No. M 33 V. 



CALAPPA FLAMMEA (Herbst) 



Cancer flammeus Herbst, Natur. Krabben u. Krebse, vol. 2, 1794, p. 161, 



pi. 40, fig. 2 ; vol. 3, pt. 3, 1803, p. 19. 

 Calappa fiammea. Bosc, Hist. Nat. Crust., vol. 1, 1802, p. 185. 



« Publ. No. 291, Carnegie Inst, of Washington, 1919, p. 175, pi. 2, figs. 7 and 8. 



