SI I'KR-OKDER V 



MA I. \roSTl: AC A 



Sub-Order B. BRACHYURA. Latreille. (Crabu.) 



Abdomen short and reduced, wit ]t<>nf <-ii<l,il ////, ,!,/ ,-nri-rd around againtt the exca- 

 vated ventral surface of the cephalothorax ; in the male narrow and p 

 two pairs of abdominal feet ; in the female broad, with four pair* 



broader than long, usually depressed ; antennae hrt ; tl,;, ///-.// com- 



pletely covering the mouth purl*. 



(1) The Dromiacea (Notopodn) have the carapac*- Mili-t nanxular, m] 

 or sub-orbicular, and the fifth pair of feet, which are sometim.-.- 

 chelate, are carried dorsally. Proaoptm, \. .M-vr l-'j^ 1394), 



FlG. 1394. 



A, I'rosopon marginatum, v. Meyer. Upper Jura (<=) ; Oerlinger Valley, 

 near Ulm. %. jj ( p. personatum. Upper Jura (y) ; Weissingen, Wiirtem- 

 berg. Rostrum enlarged. C, P. aciileatum, v. Meyer. Same locality as A 

 and D. D, P. pustulatum, Quenst. 



. 1395. 



Dromiopsisrugota, Schloth. 

 sp. Uppermost Cretiiceoun ; 

 Faxot-, Denmark. 



appears in the Lower Oolite, is abundant in the Upper Jura, and persists into tin- 

 Neocomian. Similar, but somewhat larger forms with broader carapace occur in the 



1300. 



A, B, Ranina Marestiana, Konig( = .K. Helli, Schafli.). Eocene; Kressenberg, Bavaria. Ventral and dorsal 

 views. C, Chela of R. Bouilleanu, M.-Edw. Eocene ; Biarritz, France. l /->. 



Upper Cretaceous. Such are Dromiopsis, Reuss (Fig. 1395); Itinkhontiu , NI wiling: 

 and Polycnedium, Reuss. 



(2) The Raninoidea have the carapace somewhat elongate, broadest and truncat.- in 

 front, chelae strongly compressed, and the other feet flattened and natatory. Kaniella 

 and Raninoides, Milne-Edw., occur in the Upper Cretaceous. /,'///<'/"/. I.nn. (Fig. 

 1396), ranges from Eocene to Recent. 



(3) The Oxystomata have a rounded cephalothorax with the frontal region not 

 projecting. The external maxilliprds together have a triangular outline, their apices 



