PLATE XXXVI. 



Order — Merostomata. 



Sub- Order — Xiphosura . 



Anatomy of Limulus polyphemus, Latr. (after Owen). 



Fig. 



1. Nervous system seen from the upper or dorsal aspect. (Pp. 192 — 198.) 



a. Supra- oesophageal mass. b. (Esophageal ring, n a. Ocellar nerve, n k. 

 Ocular nerve, n 3. Gastric nerve. n 4. Eirst epimeral nerve, n 5. 

 Second epimeral nerve, n 6. Its recurrent branch, n 7 to n 19. Third to 

 fifteenth epimeral nerves. p»l. Pleonal plexus. 



2. Left branchigerous limb with attached branchiae. (P. 207.) 



3. Branchial lamellae, a. Efferent plexus. All the figures, save where otherwise 



stated, are of the natural size. 

 [The permission to use the stones of our Plates XXXIV — XXXVI, which are a 

 reproduction of those numbered Pis. 37, 38, and 39, illustrating Prof. Owen's Memoir 

 (Trans. Linn. Soc, 1872, vol. xxviii, pp. 459 — 506), has been most kindly accorded by 

 the Council of the Linnean Society with the approval of the author, Prof. Owen, C.B.] 



