54 J. F. MCCLENDON. 



SUMMARY OF RESULTS. 



In the scorpion there are twenty neuromeres, corresponding to 

 the twenty body segments (not considering the telson as a 

 segment). 



The type of neuromere in the early embryo consists of a pair 

 of ganglia fused in the mid-line and two pairs of nerves, anterior 

 (" haemal " of Patten " external " of Police) and posterior (" neu- 

 ral" of Patten " internal" of Police). 



The first neuromere departs strikingly from the typical neuro- 

 mere as the segment containing it departs from the typical seg- 

 ment. The second neuromere has no anterior nerves unless they 

 have fused to form the rostral nerve. The third neuromere has 

 no anterior nerves. The eighth neuromere has no posterior 

 nerves. The remaining neuromeres are typical. 



BIBLIOGRAPHY. 



Bernard, H. M. 



'93 The Head of Galeodes and the Procephalic Lobes of Arachnidan Embryos. 

 Zool. Anz., 1893, No. 426, pp. 314-316. 



Blanchard, E. 



'52 " Organisation du Regne Animal," Arachnides. 



Brauer, A. 



'94 Beitrage zur Kenntniss der Entwicklungsgeschichte des Skorpions. Zeits. 



f. wiss. Zool., LVIL, 3. 

 '95 Beitrage zur Kenntniss der Entwicklungsgeschichte des Skorpions, II. 



Zeits. f. wiss. Zool., LIX., 3. 



Cuvier, G. 



'45 Lecons de Anatomic Comparee, 2d Ed., Vol. 3, p. 333. 



Defour, Leon. 



'56 Histoire Anatomique et Physiologique des Scorpions. 4 plates, Mem. Acad. 

 Sc., Paris, Sc. Math, et Phys., Vol. 14, 1856, pp. 561-657. 



Kowalevsky, A., and Schulgin, M. 



'86 Zur Entwicklungsgeschichte des Skorpions. Biolog. Centralbl., Bd. VI., 

 nr. 17. 



Lankester, E. Ray. 



'82 Notes on the Differences in Position of the Ganglia of the Ventral Nerve Cord 



in Three Species of Scorpion. Proc. Roy. Soc., London, Vol. 34. 

 '04 The Structure and Classification of Arthropoda. Quart. Jour. Micr. Sc. 



(N. S.), Vol. 47, P- 523. 

 Laurie, M. 



'90 The Embryology of a Scorpion. Ibid., Vol. 31. 



'96 Notes on the Anatomy of Some Scorpions and its Bearing on the Classifica- 

 tion of the Order. Ann. Nat. Hist., XVII., pp. 185-194, PI. X. 



