374 
MR. W. K. PARKER OK THE SKELETON 
archaic characters; and one kind, the Tadpole of the Nailed Toad of the Cape 
( Dactylethra ), has these parts but little more specialised than in the Myxinoids; and, 
moreover, this type has all its cartilage (which is very copious and wild-growing), even 
in Tadpoles an inch long, of a peculiarly light and cellular kind—like many parts of 
the Myxinoids skeleton. It is evidently the historic representative of an exceedingly 
ancient and generalised sort of Fish. 
Most important help to me in this attempted interpretation has been repeated dis¬ 
cussion of the subject with one of the very highest intellects ever devoted to Biological 
research—I allude to the late Professor Balfour ; that source of light and strength 
is now, unhappily, lost to me. 
Bibliography. 
Balfour, F. M., F.B.S. ‘Comparative Embryology,’ vol. ii., 1881, pp. 68-83. 
Bert. “Note sur quelques points de la Physiologie de la Lamproie.” Annales des 
Sc. Naturelles. 5th serie, tome vii. Zoologie, 1867, s. 391. 
Calberla. ‘ Tageblatt der Muenchener Naturforscher Versammlung.’ 1877. 
Furbringer. “ Untersuchungen zur vergleichenden Anatomie der Muskulatur des 
Kopfskeletes der Cyclostomen.” Jenaische Zeitschrift fur Naturwissenschaften, 
Bd. ix., 1875. 
Gegenbaur, C. 
1. “ Ueber die Entwickelung der Wirbelsaule von Lepidosteus.” Jenaische Zeit¬ 
schrift fur Medicin und Naturwissenschaft, Bd. iii. (1867), S. 376. 
2. “ Ueber das Skelettgewebe der Cyclostomen.” Jenaische Zeitschrift fur Medicin 
und gesammte Naturwissenschaft, Bd. v. (1870), S. 43. 
3. ‘ Untersuchungen zur vergleichenden Anatomie der Wirbelthiere.’ (Drittes 
Heft : Das Kopfskelet der Selachier, ein Beitrag zur Erkentniss der Genese 
Kopfskeletes der Wirbelthiere). Leipzig : 1872. 
4. ‘ Grundriss der vergleichenden Anatomie.’ Leipzig: 1878. (Also English 
Translation by Jeffrey Bell, Escp, ‘ Elements of Comparative Anatomy.’ 
London: 1878). 
Gotte, Alex. ‘ Entwickelungsgeschichte d. Unke.’ Leipzig : 1875. 
Huxley, T. H., F.B.S. 
1. ‘ Elements of Comparative Anatomy.’ 1864, pp. 189-194. 
2. ‘ The Anatomy of Vertebrated Animals.’ 1871, pp. 115-126. 
3. “Preliminary Note on the Brain and Skull of Amphioxus and Ammoccetes." 
Proc. Boy. Soc., 1874, pp. 127-132. 
4. “ On the Nature of the Cranio-facial Apparatus of Petromyzon .” Journ. ot 
Anat. and Phys., vol. x., pp. 412-429 ; plates 17, 18. 
Kolliker, A. 
1. “ Entwicklung der Wirbel der Selachier.” Verhandlungen der physikalisck- 
medicinischen Gesellschaft in Wurzburg. Bd. x., 1860 ; Taf. 3, fig. 8. 
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