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By Frederick R. Schram

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W. 1967. Invertebrate structure and function. Thomas Nelson and Sons, London. Beklemishev, W. N. 1969. Principles of comparative Press, Chicago. anatomy Bergstrom, J. 1969. Remarks on the appendages 1972. Appendage morphology Lethaia, 5, of invertebrates. University of Chicago of trilobites. Lethaia, 2, pp. 395-414. of the trilobite Cryptolithus and its implications. pp. 85-94. BORRADAILE, L. A. 1926. Notes upon crustacean limbs. Ann. Mag. Nat. , (9) 17, pp. 193-213. Bullock, T. H. and G. A. Horridge 1965.

Lehman, W. M. 1959. Neue Entdeckungen an Palaeoisopus. Manton, S. Palaeontol. , 2, pp. 96-103. M. 1949. Studies on the 1958. Habits of life Onychophora VII. Phil. Trans. Roy. Soc. (B), 233, pp. 483-580. and evolution of body design in Arthropods. J. Linn. Soc. Zool, 44, pp. 58-72. 1960. Concerning head development in the arthropods. Biol. Rev. Cambridge Philos. , 35, pp. 265-282. 1964. Mandibular mechanisms and the evolution of arthropods. Phil. Trans. Roy. Soc. (B), 247, pp. 1-183. 1965. The evolution of the arthropodan locomotory mechanisms, Part 8.

Olenoides (Whittington, 1975b), Triarthrus (Cisne, 1975), Naraoia (Whittington, 1977), and possibly Cryptolithus (Bergstrom, 1972; Campbell, 1975) possess medially directed spines or setae on the coxa which may have functioned like Limulus coxae, or possibly utilized a pushing action more like crustaceans. Phacops (Sturmer and Bergstrom, 1973), Naraoia, and Cryptolithus have spines and "gnathic" structures on more distal segments of the telopod. Ceraurus has a completely unadorned telopod, no "gnathic" structures at all.

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