AND ENDOSKELETAL SYSTEMS OF LIMULUS. 



333 



10. 



11. 



12. 



13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 



26. 

 27. 

 28. 

 29. 

 30. 

 31. 

 32. 



33. 

 34. 

 35. 



36. 

 37. 

 38. 



Intersternal. 

 Internal tergo-pygal. 

 Middle tergo-pygal. 

 External tergo-pygal. 

 Ventral entapophysio-pygal. 

 Internal sterno-pygal. 

 External sterno-pygal. 



Vertical mesosomatic (" transverse abdominal " 

 of Milne-Edwards). 



Mesosomatic oblique entapophysio-stemal. 



Branchio-thoracic (Milne-Edwards). 



A slip from 18 to the second entapophysis. 



External branchial. 



Anterior ontapophysio-branchial. 



Posterior entapophysio-branchial. 



Pre-entapophysio-branchial. 



Tergo-coxal of the first prosomatic appendage. 



Tergo-coxals of the succeeding appendages. 



25 a. Tergo-coxal of second appendage. 



25 b. Tergo-coxal of third appendage. 



25 c. Tergo-coxal of fourth appendage. 



25 d. Tergo-coxal of fifth appendage. 



25 e. Tergo-coxal of sixth appendage. 

 Antero-superior tergo-coxal. 

 Antero-inferior tergo-coxal. 

 Postero-superior tergo-coxal. 

 Postero-inferior tergo-coxal. 

 Anterior plastro-coxal of first appendage. 

 Posterior plastro-coxal of first apjiendage. 

 Second superior plastro-coxal. 



m, its anterior slip (to anterior border of ento- 

 coxite). 



«, its posterior slip (to posterior bordor of ento- 

 coxite). 

 Second mid plastro-coxal. 

 Second inferior plastro-coxal. 

 Third superior plastro-coxal. 

 0, its anterior slip. 



2^, its posterior slip. 

 Third mid plastro-coxal. 

 Third inferior plastro-coxal. 

 Fourth superior plastro-coxal. 

 q, its anterior slip. 

 r, its posterior slip. 



39, 

 40. 

 41. 



42, 

 43, 

 44, 

 45, 

 46, 

 47, 

 48, 

 49, 

 50, 

 51, 

 52, 

 53, 

 54, 

 55 

 56, 

 57, 

 58 

 59 

 60 

 61 

 62, 

 63, 

 64. 

 65. 

 66. 

 67. 

 68. 

 69. 



70. 

 71. 

 72. 

 73. 

 74. 

 75. 

 76. 

 77. 

 78. 

 83. 

 84. 

 85. 

 86. 



Fourth mid plastro-coxal. 

 Fourth inferior plastro-coxal. 

 Fifth superior plastro-coxal. 



s, its anterior slip. 



t, its posterior slip. 

 Fifth mid plastro-coxal. 

 Fifth inferior plastro-coxal. 

 Sixth antero-superior plastro-coxal. 

 Sixth mid plastro-coxal. 

 Sixth antero-inferior plastro-coxal. 

 Sixth postero-inferior plastro-coxal. 

 Internal branchial. 



Three tergo-proplastrals. 



Dorso-lateral plastro-tergal. 

 Dorso-lateral plastro-entapophysial. 

 Anterior mesoplastro-entapophysial. 

 Posterior mesoplastro-entapophysial. 

 Dorsal metaplastro-entapophysial. 

 First lateral proplastro-tergal. 

 Superior second lateral proplastro-tergal. 

 Inferior second lateral proplastro-tergal. 

 Sixth postero-superior plastro-coxal. 

 Meso-metasomatic sternal. 



I 



Mesosomatic inter-sternala. 



ChUarial. 



Gastro-sternal. 



Plaatro-buccal. 



Veno-pericardiac (pericardio-ventrals). 



A slip from the ventral longitudinal (3) to the 



second abdominal stemite. 

 A slip from .3 to third abdominal stemite. 

 A slip from 3 to fourth abdominal sternite. 

 Vertical entapophysio-metaplastral. 

 Middle entapophysio-plastral (part of 3). 

 Slip from 3 to fourth entapophysis. 

 Slip from 3 to fifth entapophysis. 

 Slip from 3 to sixth entapophysis. 

 Slip from 3 to seventh entapophysis. 

 Intertergal. 



Slip from 1 to third entapojihysis. 

 Slip from 1 to fourth entapophysis. 

 Slip from 1 to fifth entapophysis. 

 Slip from 1 to sixth entapophysis. 

 Termination of 1 in seventh entapophysis. 



