LITERATURE. 361 



APPENDIX TO LITERATURE ON TRILOBITA. 

 I. Beecher, C. E. Larval forms of Trilobites from the lower 

 Helderberg group. Amer. Journ. Sci. (3). Vol. xlvi., pp. 

 142-147. A larval form of Triarthrus. T. C, pp. 378 

 and 379. 

 The Larval Stages of Trilobites. Amer. Geol. Vol. xvi., 

 pp. 166-197. 

 II. Beecher, C. E. Thoracic Legs of Triarthrus. Amer. Journ. 

 Sci. (3). Vol. xlvi., pp. 467-470. 

 Appendages of the pygidium of Triarthrus. Op. tit. xlvii., 



pp. 298-300. 

 Structure and Appendages of Trinucleus. Op. tit. xlix., pp. 



307-311. 

 The Morphology of Triarthrus. Op. cit. (4). Vol. i., pp. 251- 

 256. 

 IIT. Bernard, H. M. The Systematic position of the Trilobites. 



Quart. Journ. Geol. Soc. Vols. 1. and li. 

 IV. Bernard, H. M. The Comparative Morphology of the Galeo- 



didae. Trans. Linn. Soc. 1896. 

 V. Matthew, W. J). Antennae and other Appendages of Triar- 

 thrus Beckii. Amer. Journ. Sti. (3). Vol. xlvi. 

 VI. Walcott, C. D. Note on some of the Appendages of the 

 Trilobites. Proc. Biol. Soc. Washington. Vol. ix. 



II. Xiphosura. 



8. Beneden, E. van. De la Place que les Limules doivent occuper 

 dans la Classification des Arthropodes d'apres leur developpe 

 ment embryonnaire. Ann. Soc. Entom. Belgique. Tom. xv. 

 1871. Ann. Mag. Nat. Hist. (4). Vol. ix. 1872. 



9. Beneden, E. van. Beobachtungen iiber die ersten Stadien der 

 Embryonalentwicklung von Limulus. Tageblatt der Jf.6. 

 Versammlung deutsch. Naturf. u. Aerzte in Wiesbaden. 1873. 

 p. 58. 



10. Brooks, W. K., and Bruce, A. T. Abstract of Kesearches on 

 the Embryology of Limulus polyphemus. Johns Hopkins 

 Univ. Circ. Vol. v. 1885. 



11. Dohrn, A. Zur Embryologie und Morphologie des Limulus 

 polyphemus. Jen. Zeitschr. f. Nat. Bd. vi. 1871. 



12. Gerstacker, A. Crustacea. Bronrt's Classen und Ordnungen 

 des Thierreichs. Bd. v. Abth. i. 1866-1879. 



