1896.] NATURAL SCIENCES OF PHILADELPHIA. 255 



248 — The gestation of armadillos. Amer. Nat., 1887, pp. 95- 

 96. (Review of von Ihering's paper). 



249 — The ventral suckers or sucking disks of the tadpoles of dif- 

 ferent genera of frogs and toads. Amer. Nat., 1887, pp. 263-264. 

 (From Dr. Ryder's notes. Citation not found). 



250 — Haddon's " Introduction to the Study of Embryology." 

 Amer. Nat., 1887, pp. 292-293. 



251 — Development of the carnivora. Amer. Nat., 1887, pp. 

 394-396. (Review of A. Fleischmann's work). 



252 — Suggestion respecting the epiblastic origin of the segmental 

 duct. Amer. Nat., 1887, pp. 587-590. (Review of Prof A. C. 

 Haddon's paper). 



253 — The development of an eight-limbed vertebrate. Amer. 

 Nat, 1887, pp. 862-863. (Review of S. Watase's paper.) 



254 — Spermatogenesis in mammalia. Amer. Nat., 1887, pp. 946- 

 948. (Review of paper by Dr. Carl Benda). 



255 — Development of the Coecilians. Amer. Nat., 1887, pp. 

 1035-1036. (Review of work of Messrs. Sarasin). 



256 — The origin of the segmental duct in elasmobranchs. Amer. 

 Nat., 1887, p. 1037. (Notice of Dr. Beard's work). 



257 — Rudiments of true calcified teeth in the young of Orriitho- 

 rhynchus. Amer. Nat., 1888, pp. 368-369. (Review of paper by 

 E. B. Poulton). 



258 — The ectoblastic origin of the Wolffian duct in the chelonia. 

 Amer. Nat, 1888, p. 369. (Notice of paper by M. Mitsukuri). 



259 — Origin of the Wolffian duct in lacertilia. Amer. Nat., 

 1888, p. 369. (Notice of paper by J. von Perenyi). 



260— The origin of the mammie. Amer. Nat., 1888, p. 370. (Note 

 upon investigations of W. Haacke). 



261 — The several functions of the enamel organ in the develop- 

 ment of the teeth of mammals, and on the inheritance of mutilations. 

 Amer. Nat, 1888, pp. 547-550. (Review of researches of von 

 Brunn et al). 



262 — Researches upon the development of Comatula. Amer. Nat, 

 1888, pp. 657-659. (Review of paper by Barrels). 



263 — Observations on the development of cephalopods. Amer. 

 Nat., 1888, pp. 754-755. (Review of S. Watase's paper). 



264 — On the development of the calcareous plates of Asterias. 

 Amer. Nat., 1888, p. 755. (Note on J. Walter Fewkes' work). 



265 — The value in classification of the stages of growth and de- 

 cline with proposals for a new nomenclature. Amer. Nat., 1888, p. 

 755. (Note on A. Hyatt's paper). 



266 — Development of the sea-bass (Serranus atrarius). Amer. 

 Nat, 1888, p. 755. (Note). 



267 — On the primary segmentation of the germ-band of insects. 

 Amer, Nat., 1888, pp. 941-942. (Review of Veit Graber's work). 



268 — Development of the peripheral nervous system of verte- 

 brates. Amer. Nat., 1888, pp. 1132-1134. (Review of Dr. Beard's 

 work). 



