754 



MR FRANK J. COLE 



15. Retzius, G., Biol. Unters., N.F., i. p. 94, 1890. Cordis caudalis. 



16. Schaffer, Z.f. w. Z., Bd. lxxx. p. 155, 1905. Histology of tendons of "tongue" muscles. 



17. Schneider, Beit. z. vergleich. Anat. u. Entwick. d. Wirbelthiere, Berlin, 1879. Parietalis, "Tongue" 



muscles, Obliquus, Rectus, Transversus caudalis. 



18. Zool. Beitrdge, ii., Breslau, 1887. Histology of Myxinoid muscle. 



19. Schreiner, Bergens Mus. Aarbog, 1898, No. i., 1899. Visceral muscles, Constrictor pharyngis, Con- 



strictor branchiarum et cardias. 



20. Wiedersheim, Lelirbuch d. vergleich. Anat. d. Wirbelthiere, pp. 232-3, Jena, 1883. Body 



musculature. 



21. Wikstrom, Anat. Anz., Bd. xiii. p. 401, 1897. Body musculature. 



EXPLANATION OF PLATES. 



Reference Letters.* 



a. c. m. Middle cutaneous artery, 

 a. c. s. Superior cutaneous artery. 

 a. sp. Spinalis artery, splitting into superior and 

 inferior spinal arteries. 

 a. v. c. i. Inferior cutaneous artery and vein. 

 a. v. d. Dorsalis artery and vein. 

 a. v. v. Ventralis artery and vein. 



c. ao. Cardiac aorta. 

 c. b. c. Branchial portion \ of the M. constrictor 

 c. b. c. Paired anterior limb Y branchiarum et 

 c. b. c". Cardiac portion J cardiae. 



The numerals {1-14) indicate the regions 

 of the muscle referred to in the text 

 (q.v.). 

 cd. c. M. cordis caudalis. 

 c. e. External head 

 c. e. Internal head 

 c. e". Fused external and 

 internal heads 

 c. g. p. Lateral head \ of the M. copulo glossus 

 c. g. p". Median head J profundus. 

 c. g. s. M. copulo-glossus superficialis. 

 c. g. s. Median slip of tendon of above to ventral 



skin. 

 c. g. s". Lateral slip of tendon of above to base of 

 fourth tentacle. Between these two 

 slips the intermediate portion of the 

 tendon is bending round into the mouth. 

 c. h. M. cranio-hyoideus. 

 ■c. i. R. cutaneus inferior of the spinal nerve, 

 c. to. R. cutaneus medius of the spinal nerve. 

 c. o. M. coronarius. 



of the M. copulo- 

 ethmoidalis. 



c. p . 



c. p". 



c. p . 



cp. e. 



c. pi. 



cp. t. c. 



cp. t. c'. 



cp. t. c . 



c. q. p. 



c. q. s. 



c. sp. 



d. m. b. 



of the M. copulo- 

 tentaculo - 

 coronarius. 



d. r. 



e. 

 e. n. 

 f-r. 



h. c. g. 

 h. c. p. 

 i. c. b. 

 l.lg. 

 I. p. c. 



m. 



First division ^ , ,, Ayr , . , 



of the M. constrictor 

 Second division Y , 



pharyngis.- 

 Third division J 



M. copulo-copularis. 



M. copulo-palatinus. 



First or principal head 



Posterior division 



Anterior division ( = Ten- 



tacularis anterior of 



P. Fiirbringerj 

 M. copulo-quadratus profundus. 

 M. copulo-quadratus superficialis. 

 R. cutaneus superior of the spinal nerve. 

 Dorsal motor branch of the ventral root of 



the spinal nerve. 

 Dorsal root and ganglion of the spinal 



nerve. Above, it gives off the dorsal 



sensory branch, and below, the ventral 



sensory branch. 

 Vestigial eye. 

 M. ethmoideo-nasalis. 

 The ventral "fin rays" of the caudal 



fin (those at posterior extremity re« 



moved). 

 M. hyo-copulo-glossus. 

 M. hyo-copulo-palatinus. 

 Inferior chondroidal bar. 

 M. longitudinalis linguae. 

 Large left posterior cardinal vein, connected 



with the small right one by an inflated 



anastomosis. 

 Mucosa enveloping dental apparatus. 



* Care has been taken throughout this work not to use the same letters for different structures. Hence any 

 letters used in the present Part but not explained in this list will be found in the list given in Part I., pp. 786-7. 



