SUB-CLASS I MEROSTOMATA 
Family 2. Belinuridae. Packard. 
Body limuloid in general aspect. Cephalothorax with long, slender genal spines ; its 
appendages as in larval Limulus. Abdomen with the segments 
distinct ; telson long or short. 
Belinurus, Konig. (Fig. 1412). Cephalothorax horseshoe- 
shaped; its central portion sub-quadrate and surrounded by a 
broad, flat, marginal area. Abdomen with eight segments, 
besides the very long, slender caudal spine; segments seven 
and eight are consolidated. Coal Measures; Europe and 
Illinois. 
Prestwichia, Woodw. (Euproéps, M. and W.). Differs from 
Belinwrus 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 
caudal spine. Upper Devonian ; Pennsylvania. 
CG, 
Miinst. 
Laineck, 
reuth. 

B, The Prestwichia 
stage of larval Limulus 
(after Dohrn). 
Fie. 14138. 

Coal 
Woodward). 
Nal 
Kt 
: \ 
Hy 
v7 
Fie, 1412. 
Belinurus reginae, Baily. 
Measures ; 
County, Ireland. 
uk 
Limulus priseus, 
1/. 
/ 
1+ 
near 
Muschelkalk ; 

Bay- 
Queen's 
1/, (after 

A, Limulus Walchi, Desm. Lithographic Slates: Solenhofen, Bavaria. Dorsal and ventral aspects, the 
latter with legs partially preserved. Original in Munich Museum. 1/. 
