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. dt. xlvii., 



pp. 298-300. 

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



307-311. 

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



256. 



III. 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. D. Antennae and other Appendages of Triar- 

 thrus Beckii. Amer. Journ. Sci. (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. Tagellatt der ^6. 

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

 p. 58. 



10. BROOKS, W. K., and BRUCE, A. T. Abstract of Researches on 



the Embryology of Limulus polyphemus. Johns Hopkins 

 Univ. Circ. Vol. v. 1885. 



11. DOHRN, A. Zur Embryologie und Morphologic des Limulus 



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



12. GERSTACKER, A. Crustacea. Bronn's Classen und Ordnungen 



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



