100 PROCEEDINGS OF THE ACADEMY OF [1888. 



Animals which are uniformly furred carry occasional warts on 

 the face — one of these is always supra-orbital and another is on the 

 cheek, and forms in the dog the so-called " kiss mark." It is often 

 separately marked by tan in the black and tan terrier, when it con- 

 stitutes a "point" for the breeders of this animal. 



Virchow' expresses the opinion that retention of lanugo upon the 

 face may be confined to the distribution of the fifth pair of cranial 

 nerves. 



Muscle-Regions. — The stripes and spots on the limbs and the dap- 

 ple-marks on the trunk, as well as some of the broader sheets of color, 

 appear to be related to the intervals between muscle-masses or to 

 the extent of skin-sui'faces which corresponds to muscles. 



The depression between the radial and digital extensors in the 

 Felidffl is often marked by a black stripe. Fells chaus of India ac- 

 cording to Sir W. Elliot' exhibits a brown bar on the inside of the 

 arm. This writer assumes that the mark is distinctive of the East 

 Indian sj^ecies. I have seen a black mark in the same locality, in 

 many examples of the varieties of the domestic cat in or near 

 Philadelphia. 



The black mark on the front of the thigh in lemurs (see p. 93) is 

 limited distally to the region of the tibia at which the gracilis, semi- 

 tendinosus and sartorius muscles are inserted. The region of the 

 back which answers to the lower trapezius sheet is abruptly outlined 

 in pure black, in contrast to the white color of the loin and of the 

 lower distal region, in Indris hrevimudaius? H. Ranke^ reports a case 

 of trichosis circimiscripta, in which a patch yvns found in front of and 

 below the right knee and a second over the front of the left knee. 

 These marks may be held to be homologous with the distal ends of 

 the black femoral stripe in Indris brevicaudatus .as already stated 

 above. 



Regions which are rich in Seba and Moisture. — Eschricht^ called 

 attention to the fact of the early appearance of the sebaceous glands 

 in connection with the development and distribution of the hair. 

 While the presence of seba is found associated with hair-growth 

 the fact that some clumps of hair are found in regions which 

 are especially rich in the secretions poured from the skin, form a 



I Berliner Klin. Wochenschr. 1873, No. 29. 



"^ Darwin, An. under Domestication. Eng. Ed. I. 44. 



3 Am. Mus. No. 260. 



^ Archiv. f. Anthropologie, 1883, taf. XIII. 



5 Miiller's Archiv. 1837, 44. 



