118 MEMSTIC VARIATION. [part I. 



change of articular processes to the human numbers is especially 

 worthy of notice.] 



* Simia satyrus (Orang-utan). Out of eight skeletons in the 

 Mus. Coll. Surg., C 7, D 12, L 4 occurs in seven. In young 

 specimens the distinction between the last lumbar and the first 

 sacral is clearly shewn by presence of pleurapophysial ossifications in 

 the transverse processes of the latter. Thus though Simia resembles 

 Man in the number of ribs, it differs in the total number of prae- 

 sacral vertebra?. Cat. Mus. Coll. Surg., 1884, n. p. 10. 



The arrangement C 7, D 12, L 4, S 5 occurs in a great number 

 of specimens (for cases quoted, see Rosenberg, Morph. Jahrb., i. 

 p. 100, Tabellen ; Cat. Mus. Coll. Surg, ttc.) 



36. Adult male, Sumatra. C 7, D 11, L 5, S 5, C 2. Mus. Coll 

 Surg.f No. 37. 



37. Foetal skeleton. C 7, D 11, L 5, S 5, C 2. Trinchese, S., 

 Ann. Mus. civ. Storia nat. Genova, 1870, p. 4. 



38. Adult. C 7, D 11, L 4, S + C, ankylosed together, containing 

 8 ? pieces. Camb. Univ. Mus., 1160, a. 



39. Adult, C 7, D 12, L 4, S 4, C 3. The last lumbar shared 

 in supporting iliac bones, de Blainville, Osteogr., Primates, Fsc. I. 

 p. 29. 



40. A young specimen, well preserved : there were certainly L 4, S 3. 

 C 4, but in the adult mentioned above, one of the coccygeal was 

 joined to the sacrum, de Blainville, ibid. 



41. Young specimen in spirit, C 7, D12, L 4, So, C 2. Rosenberg, 

 E., Morph. Jahrb. I. p. 160. 



42. Specimen in spirit, not full grown, C 7, D 12, L 4, S 5, CI. 

 There was no doubt that only one coccygeal was present. Rosenberg, 

 ibid. 



43 [Hylobates. Considerable differences in the number of vertebrae 

 and ribs found in this genus are recorded in the Catalogue of the 

 Museum of the College of Surgeons, &c. ; since however the specific- 

 divisions of the genus are very doubtful (see Catalogue, II. p. 15), 

 it is not possible to consider these as necessarily individual variations. 

 See also Rosenberg, I.e., Tables.] 



Bradypodid^e. 



To the study of Variation of the vertebral regions the pheno- 

 mena seen in the Sloths are of exceptional importance, and in 

 attempts to trace the homologies of the segments special attention 

 has always been paid to them. The following table contains brief 

 particulars of 11 specimens of Brady pus and 11 of Cholcepus seen 

 by myself in English museums, and of a few others of which 

 descriptions have been published. To these is added a summary 

 of 40 specimens of Bradypus and 9 of Cholcepus in German 

 museums 1 examined by Welcker. His account is unfortunately 

 not given in detail, but I have tabulated his results so far as is 



1 viz. Gottingen, Tubingen, Marburg, Leipzig, Frankfurt, Berlin, Giessen, Jena 

 and Halle. 



