SfH-CLASS i 



MKIUJSTO.MATA 



671 



Family 2. Belinuridae. Packard. 



Body limuloid in general aspect. Cephalothonu: fit I, l,,it(j, slender genal apine* ; 

 appendages as in larval Limulus. Abdomen with the segments 

 distinct ; telson long or short. 



Belinurus, Konig. (Fig. 1412). Cephalothorax 

 shaped; its central portion sub-quadrate and surrounded by a 

 broad, flat, marginal area. Abdomen with eight aegnn-nis, 

 besides the very long, slender caudal spine ; segments seven 

 and eight are consolidated. Coal Measures ; Europe and 

 Illinois. 



Prestwichia, Woodw. (Euproops, M. and W.). Differs from 

 Belinurus in having seven abdominal segments besides a short 

 caudal spine. Coal Measures ; Europe and Illinois. 



Protolimulus, Pack. Cephalothorax large, with small 

 appendages ; its genal angles less produced than in preceding 

 genera. Abdomen with six segments besides a large, thick tounty,, Ireland 

 caudal spine. Upper Devonian ; Pennsylvania. 



Woodwind). 



>/i (after 



B, The Prestwichia 

 stage of larval Limulus 

 (after Dohrn). 



C, Limulus priteus, 

 Mmist. Muschelkalk; 

 Laineck near Bay- 

 reuth. Vi- 



Fi'.. 111.-:. 



A,Liimdus Wcdchi, Desm. Lithographic Slates: Solenhofen, Bavaria. Dorsal aud ventral aspects, the 

 latter with legs partially preserved. Original in Munich Museum. 1/2- 



