ox THE DEVELOPMEXT OF LI1MULUÖ LOXGISPIXA. 



Fig. IV. 



Fi?. TT.— ly. Limulus lorgispina l/". 



'Fig. IV. A. Transver.se secfimi ilivongli tlin 

 ceplmlotliorax at the level of tlie lateral 

 eyes. B. Transverse soctinu tlironp:]! the 

 alxToraen at the level of the second lateral 

 spine. 



Flcr.Y.A Trilobite (Angelina Sedg- 



Fig, V. •Wickii). A/ter Nicholson. 



jileurae in the abdomen, und the seoo.id (exter.ml) p;iired lateral lobes, 

 which appear (3nly in the céphalothorax, as thi free cheeks (hr. eh.). 



