354 
Wir.LIAM F. Al.LEN. 
cartilaginous bar or l>asal fusion of the dorsal fin-rays or radials. 
d. bar. Massing of the mesenchyme to form the median dorsal bar. 
Dep. In Fig. 7 certain depressions in the lateral wall of the caudal vein, 
which doubtless represents the remains of an earlier embryonic con- 
dition of the vein. D. R. Dorsal fin-radials or rays. I). S. Dorsal fin- 
ray veno-lymphatic canals or sinuses. 1). V. Dorsal veno-lymphatic 
trunk, d. v. Above in embryonic condition. Ep. Epidermis, e. per. 
Embryonic external perimysium. F. C. T. Fibrous connective tissue. 
Fib. Aluscle-fibrillse. Hee. T. Intersegmental or hsemal lymphatic canal. 
Tuts. A. Intersegmental artery. Tuts. V. Intersegmental vein. i. per. 
Eml)ryonic internal perimysium. L. Can. A. Left caudal artery. 
L. Can. H. Left caudal heart. 1. can. h. Above in embryonic condition. 
L. Can. H. (i). Anterior portion of the left caudal heart. L. Can. V. 
Left caudal vein. L. The. T. Longitudinal haemal lymphatic trunk or 
trunks. L. Fee. T. (i). Posterior portion of the longitudinal hseinal 
lymphatic trunk. L. L. Fee. T. Left longitudinal hsemal lymphatic 
trunk. L. L. IF. T. (i). Left I)i-anch of the posterior portion of the 
longitudinal ha3inal lymphatic trunk. L. L. S. Left lateral veno- 
lymphatic sinus or trunk. 1. 1. s. Above in embryonic condition. 
L. L. S. C. Left lateral sinus mesenchymal caVity. L. L. S. Cou. 
Left lateral sinus connection with the ventral trunk. L. Proc. Lateral 
X^rocess of the median ventral cartilaginous bar. 1. proc. Above in 
embryonic condition. L. V. V. Left ventral veno-lymphatic trunk. 
Posterior x^ortion homologous to caudal trunk of the higher fishes. 
/. V. V. Above in embryonic condition. M. C. C. Musculi cordis caudalis 
or myocardium of Favaro. m. c. c. Above in embryonic condition. 
M. C. C. F. Musculis cordis caudalis fibre. AT. C. C. ATyob. Musculi 
cordis caudalis myoblast. Ales. Mesenchyme. AT. Sac. AIucous sac. 
ATy. Myelon or sx^inal cord. Alyo. Myotonies, myo. Above in the 
Xirocess of formation. ATyob. Myoblasts. Alyo. F. Myotome muscle 
fibre. Alyo. Alyob. Myotome myoblast. Nc. Notochord. 0. (i). First 
or anterior orifice between the ventral veno-lymxihatic trunk and the 
caudal heart, o. (i). Probable x^oint where the anterior orifice between 
the ventral trunk and the caudal heart will latei- occur. 0. ( 2 > Second 
or x^osterior communication between the ventral veno-lymxihatic trunk 
and the caudal heart, o. ( 2 ). Probable x^lace of the x^osterior communi- 
cation between the ventral trunk and the caudal heart. P. In recon- 
structions, x^artition of mesenchyme sexiarating two x^arts of the caudal 
vein or heart. Possibly the remains of a wall sexiarating two cavities. 
K. C. Red corxiuscle. R. Can. A. Right caudal artery. R. Can. F. 
Right caudal heart. r. can. h. Above in embryonic condition. 
R. Can. V. Right caudal vein. R. L. Fee. T. Right longitudinal hannal 
lymxihatic trunk. R. L. Fie. T. ( 2 ). Right branch of the xiosterior 
portion of the longitudinal hicmal lymxihatic trunk. R. L. S. Right 
