330 CRUSTACEA. DECAPODA 



Eryma. Body cylindrical. Cephalothorax covered with 

 granules, with a median dorsal groove, a deep cervical suture, and a 

 pointed rostrum. Behind the cervical suture are two nearly parallel 

 grooves which unite at the sides. The three anterior pairs of 

 ambulatory limbs with chelee, the first pair being very large, the 

 others small. Telson undivided. Lias to Upper Jurassic. Ex. 

 E. leptodactylina, Solenhofen Limestone ; E. elegans, Great Oolite, 

 etc. 



Enoploclytia. Body large, long, narrow ; surface roughened 

 with granules and tubercles. Cephalothorax elevated, narrowing in 

 front, with a long rostrum. Behind the deep cervical suture are 

 one or two nearly parallel furrows, from which lateral branches pass 

 to the cervical suture. First pair of ambulatory legs very strong, 

 with large chelee having teeth on the inside of the fixed part ; 

 second and third pairs of legs slender, also with chelae. Telson 

 large, subtrigonal. Upper Cretaceous. Ex. E. leachi, Chalk. 



Hoploparia. Body elongate, slightly compressed laterally. 

 Cephalothorax covered with fine granules. Rostrum very narrow, 

 long, sharp and not dentate. Cervical suture deep, not reaching 

 the margins of the carapace ; in front of the cervical suture is a 

 X-shaped groove. The two anterior pairs of ambulatory limbs very 

 long, provided with large chelae. Abdomen sub-cylindrical. Lower 

 Cretaceous to Eocene. Ex. H. longimana, Lower Greensand. 



Section 2. Brachyura 



This section includes the crabs. The abdomen is short 

 and small ; it is bent up underneath the thorax, and bears 

 from one to four pairs of appendages, but is without a tail 

 fin. The cephalothorax is broad. 



Dromia. Cephalothorax oval or rounded, very convex, with 

 the entire surface punctate ; anterior part with pointed elevations, 

 posterior third with irregular ridges ; divided into regions by two 

 transverse grooves. Rostrum short, triangular. Orbital notches 

 (in which the eyes rest) are very deep. First pair of ambulatory legs 



