Warren Harmon Lewis 147 



formation of these fins. Boyer^ believes elements from the peripheral 

 layer of certain myotomes are contributed to the pectoral plate which 

 comes from the somatopleure. Corning" believed in 1894 that the 

 pectoral fins in teleosts received muscle-plate buds, but he has since 

 come to the conclusion " that these fins in teleosts do not receive such 

 buds, and agrees with Harrison that the myotomes take no part in the 

 formation of the pectoral fims. Kaestner " was not able to show in 

 Anura that the myotomes take any part in the formation of the limbs, 

 though he believes they do at a very early period. Field " believes that 

 the elements which form the muscle of the extremities in Amblystoma 

 are separated at a very early age from the ventral part of the myotome. 

 Byrnes " work, both her embryological and experimental studies, shows 

 that " the myotome processes, as such, take no part in the formation of 

 the limbs . . . The limbs are of somatopleuric origin, i. e., the muscle, 

 cartilage, and connective tissue." Goette " believes that the limb mus- 

 cles in Bombinator develop from the outer layer of the muscle plate. 

 Van Bemmelen" believes that in the lizard the limb muscles are derived 

 from the myotome buds. Mollier" finds cells from myotome buds go 

 into the arm anlage in Lacerta niuralis. According to Patterson," the 

 limbs of the chick are derived wholly from the somatopleure. He does 

 not find muscle buds or homologous structures entering into the limbs. 

 In a recent paper by Maj," the conclusion is reached that the myotomes 



9Boyer, The mesoderm in Teleosts, etc., Bull. Museum Comp. Zool., Harvard 

 Univ., Vol. XXIII, 1893. 



lo Corning, Ueber die Ventralen Urwirbelknospen in der Brustflosse der Tele- 

 ostier, Morph. Jahr., Bd. XXII, Heft 1, 1894., 



"Corning, Ueber die Entwickelung der Zungen Musculatur bei Reptilien, Anat. 

 Anz. (Gesellschaft) 1895. 



i^l^aestner, Extremitaten- und Bauehmusculatur bei Auuren, Arcbiv f. Anat. und 

 Phys. (Anat. Abtheil.), Hefte .5 und 6, 1893. 



13 Field, Die Vornieren Kapsel, ventrale Musculatur und Extremitiitenanlagen bei 

 den Amphibien, Anat. Anz., Bd. IX, No. 33, 1894. 



14 Byrnes, Op. cit. 



13 Goette, Die Entwickelungsgeschichte der Unke., 187.5. 



16 Van Bemmelen, Ueber die Herkunf t der Zungen- und Extremitiitenmusculatur bei 

 Eidechsen, Anat. Anz., Bd. IV, 1889. 



1' Mollier, Die paarigen Extremitaten der Wirbelthiere. Anat. Hefte, Bd. Ill, 

 Heft VIII; Bd. V, Heft XVI. 



18 Patterson, On the fate of the muscle plate and the development of the spinal 

 nerves in birds and mammals. Quart. Jour. Micr. Sci., Vol. XXVIII, 1887. 



"Maj, Contribute alio studio dello sviluppo della musculatura negli arti. Osserva- 

 zioni sur polio (Gallus domesticus), Dal Bollettino della Soc. Med.-Chir. di Pavia, 

 1901. 



12 



