1871.] 



315 



[Wilder. 



3. That in a few cases, the human pollex has consisted of three 

 phalanges, and so resembled the other digits and the quintus ; such a 

 case figured by Annandale, 1 who adds that he has met with others; 

 Dubois describes a case 2 which is referred to by Fort 3 ; and in the 

 Cabinet of the Boston Society for Medical Improvement, is a plaster 

 cast of another case which came under the observation of Dr. B. E. 

 Cotting, and was described by Dr. J. B. S. Jackson. 4 Dr. Fort men- 

 tions other instances of an unusual increase or decrease in the num- 

 ber of digital phalanges. 



4. That all the digits and dactyls may possess less than three 

 phalanges, as in Chrysochloris, while in Cetacea all of them may pos- 

 sess more than that number. 



5. That in many Mammalia the number of minimal and quintal 

 phalanges is less than three; which removes, so far as those species 

 are concerned, the objection to homologizing minimus and quintus 

 with primus and pollex ; the following list gives the species, the num- 

 ber of phalanges, and the authority for the statement; no reference 

 is made to the many species in which the minimus and quintus are 

 wholly wanting, or represented only by a metacarpal or metatarsal. 

 The Cetecea are enumerated in a separate table, since their digital 

 phalanges generally vary from the usual number with Mammalia. 



POLLEX. 



Ateles lorO FL, 71, 258. 



Colobus 1 " " 



Elephas 1 Hum., 36, 5. 



INDEX. 



Perodicticus 2 FL, 71, 258. 



Arctocebus, 2 Miv.,276. 325. 



Cheiroptera (generally) 2 FL, 71, 262. 



Chrysochloris 2 Miv., Journ. of Anat. and Phys. 



2, 133. 



MEDIUS. 



Chrysochloris. . . . . , 2 Miv., Journ. of Anat. and Phys., 



2 133 

 Pteropinae 2 FL, 71,262. 



ANmrLAitis. 

 Cheiroptera, (generally). . . 2 FL, 71, 262, 



1 Malformation of fingers and toes; p. 29; pi. ii, fig. 19, 



2 Archives de Medicin, Apr., 1826. 

 s Difformit6s des doigts, p. 59, 1869. 



4 Catalogue of Museum of Med. Imp. Soc, p. 871, 



