^o. 472] ANATOMY OF CRYPTOBRANCHUS 311 



ten cartilaginous elements, which are arranged in two more or 

 less definite groups, the proximal and the distal, with two elements 

 in an intermediate position. Articulating with the tibia, or rather 

 with the cartilage that tips the distal end of the tibia, is the tihiale, 

 {T' .) an irregular, elongated mass of cartilage. Attached in the 

 same way to the fibula is the fihulare (Fb/); and lying in an inter- 

 mediate position and articulating more or less with tibia, fibula, 

 libiale, and fibulare is the angular intermedium (In.). The 

 distal row of tarsal elements (Dt.) is composed of five masses of 

 cartilage, all of about the same size, and each attached to the basal 

 end of one of the metatarsal bones. These distal cartilages are 

 smaller than the proximal. Between the proximal and the distal 

 rows, are two small elements (sometimes fused into one) called 

 bv Osaw^a the " centrals tibiale" and "cenirale fbulare" (Ct. and 

 Cf.). 



The mefatarsits (M.) is composed of five elongated, cylindrical 

 bones, somewhat enlarged as usual at the ends. They are of 

 nearly the same length, though the first (on the tibial side) is 

 somewhat shorter than the rest, and the third and fourth are 

 somewhat longer. 



The phalanges (PI.) of the first, second, and fifth digits are 

 made up of two elements, while those of the third and fourth 

 digits contain three elements each. The terminal element of 

 each digit is a pointed, claw-like structure. 



The A^^scular System 



For the purpose of working out the course of the blood vessels 

 the usual method of injecting the arterial and venous systems 

 with masses of difi'erent colors was used. The injection of the 

 arterial svstem was accomplished with but little difficulty by 

 inserting the cannula into the well developed conns arteriosus, 

 and thronu-h it forein- the inieeti..n mass into all of the arteries, 

 lint the injection of the veins was a more dilhcnlt matter, and 

 will be described in connection with tl 1 ji t tl e 



