74 William F. Allen 



C. A., caudal artery. 

 Cau. S., caudal sinus. 

 C. F., caudal fin. 

 Con. T., connective tissue. 

 C. P. M., caudal fin profundus muscles. 

 C. R., caudal rays. 

 C. R. A., caudal ray arteries. 

 C. R. C, caudal ray subcutaneous canals. 

 C. R. v., caudal ray veins. 



C. T., caudal subcutaneous trunk or posterior continuation of the ventral 

 subcutaneous trunk. 



C. v., caudal vein. 

 Der., dermis. 



D, F. A., dorsal fin artery. 

 D. F. v., dorsal fin vein. 

 D. R., dorsal fin rays. 



D. R. A., dorsal ray arteries. 



D. R. C, dorsal ray subcutaneous canals. 



D. R. M., dorsal ray levator and depressor muscles. 



D. R. v., dorsal ray veins. 



D. T., dorsal subcutaneous trunk. 



End., endothelium. 



F. Con. T., fibrous connective tissue. 



Hse. C, hsemal cauals. 



Hge. S. (1) to (9), caudal hremal spines. Hypural bones of Teleosts. 



Hse. T., hsemal longitudinal trunk. 



I. Neu. S., interneural spines. 



Intm. C, intei'muscular or transverse subcutaneous canals. 



L. A., lateral arteries. 



L. C. A., left caudal artery. 



L. Cau. S., left caudal sinus. 



L. Cau. S. O., left caudal sinus opening into the caudal vein. 



L. Cau. S. v., semi-lunar valves guarding entrance of the left caudal sinus 



into the caudal vein. 

 L. Hae. T., left longitudinal h;Temal trunk. 

 L. T., lateral subcutaneous trunks. 

 L. v., lateral veins. 

 My., myelon or spinal cord. 

 Myo., myotomes of the great lateral muscles. 

 Neu. S., neural spines. 

 Neu. v., neural veins. 

 Neu. V. (1), last neural vein. 



Neu. V. (1) O., opening of the last neiu'al vein into the caudal vein. 

 0., connection or communication between the two caudal sinuses. 

 Pig., pigment. 

 PL, blood plasma. 



