194 



COMPARATIVE ANATOMY. 



A we. 11 differentiated Harderian gland is present in the whole 

 scrit-s uf animals i'roin the tailless Amphibia to the Mammalia. 

 Amongst the latter it is wanting in the Cetacea and Primates only. 



7- ft 



FIG. 1 ."'.'. DIAHKAM OF THE LACIIYMAL APPARATUS OF MAN. 



TJ), lacryjual gland, divided up into several portions ; **, ducts of the lacrymul 

 gland; tt, puncta lacrymalia ; TJ!, 2'A' 1 , upper and lower lacrymal canals; 

 >', larryinal sac ; D, naso-lacrymal duct. 



T 1 1 e ^ I e i b o m i a n glands, belonging to the grou p of sebaceous 

 glands, are confined to the Mammalia, and lie embedded in the 

 substance of the eyelids in the form of branched tree-like tubes 

 or clustered masses. They open on the free edge of the lid, and 

 produce a, fatty secretion. 



BIBLIOGRAPHY. 



Br.nr.Ki:, I".. I'x'itrii'jezwr Anatomie des Schonjanes der Fischc. Morphol. Jahrb. Bd. 



VIII. 1882. 

 BOLL, F. Zitr Anatomic und Physiologic de.r Retina. Arch. f. Anal. u. Physiol. 



-. Physiol. Al.thl. 



CARRIEKE, J. l>i ^>/i"i;iane der Thierc. Miinoheu und Leipzig, 1885. 

 II i IMM \xx, C. Beitrage zur Anatomie der Retina, Arch. f. mikr. Anat. Bd. XIV. 



1877. 



Kr>-i,!.n, L. Zur Entwicklung des Auges. Leijizig, 1877. 

 l.i i i K.VUT, It. Organologie des Auges. In A. Gra>'fe und Th. Saemisch, Handbuch 



dcr </i'xrt/inten AugenJttilkundc. Bd. I. Anatomic und Physiologic. 

 MAN/.. W.Entw.-Gesch. des menschl. AIKJCS. Ibid. 

 .Mi 1.1.1:1:, "R.Gesammelte und hinterlassene Schriftcn zur Anatomic und Physiologic 



des Auges. Herausgegeb. von 0. Becker. Leipzig, 1872. 

 MILLER, W. Ucb. die Stammescntwick. des Schoryanes dcr JJ'irbcUhicrc. Festgabc 



von <'. Lin/trig. Leipzig, 1874. 

 SARDK.MANN, E. Die Thracnr.ndrusc. Prcisschr. Frieburgi/B. 1884. Abstract in tln> 



ZooL Am. 1884. 

 Siiii'LZE, M. Die H'liiiti. Sti-ifi,-- v'.v J[,i nillnii'li ,!,--, L'-Jirc von drn Cffurbni. 



Li-ip/ig, 1871. S ( nisi .lir/iir far niil.-r. Jit'i/minr, Bd. II., 111., IV., V., 



VI., & VII. 



a:. (i. /, ////-. </. Anatomh der Sinnesorgane. Krlangfii, 1S83. 



AUDITORY ORGAN. 



It is very p/obable that tlu- auditory organ, like those of 

 smell and taste, has been derived primitively from a modified 

 integumentary sens"-organ (Wgan <>f ilie lateral line). The 



