39° ZOOLOGY 
Behind the prosoma, the body is covered in by an abdominal 
carapace, the anterior part of which shows dorsally faint traces 
of being composed of seven segments. This region corresponds 
with the mesosoma of other forms; behind it the metasoma pre- 
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Fic. 222.—Under side of Limulus polyphemus, Latr., @ . 
C. Carapace. 3a’. Detached pedipalps of 6. 
Th. Abdomen(=meso- and meta-soma). 4-7. Thoracic walking-legs. 
T. Telson or spine. 8. Lamellae with genital openings, 
2. Chelicerae. 9-13. Branchiferous lamellae. 
3. 
Pedipalps. m. Mouth. 
sents a smooth unsegmented surface. The anus is situated at the 
end of the metasoma, and a long pointed spine extends behind it. 
Appendages of Limulus. 
1. Chelicerae. 7. Plates with genital pores. 
2. Leg-like appendages (pedipalpi). 8. 5, », branchiae. 
3. 39 99 Q Ee) 99 2? 
4, 9? 29 10 39 29 99 
5. 9 39 1 1. 9 32 be) 
6. > bel 12. 2) ”? 9? 
The appendages which are found on the ventral surface of 
the body commence with a small three-jointed pair of chelicerae, 
placed one on each side of the upper lip, which overhangs the 
mouth. The next five pairs of appendages are leg-like, and 
are arranged round the mouth; they consist of six joints—the 
proximal one or coxa is enlarged, and its anterior border is 
