1899.] NATURAL SCIENCES OF PHILADELPHIA. 317 



grooves, which are conspicuously developed and extend without 

 break from median ventral to median dorsal lines. Between the 

 origin of the fore and hind limbs there are thirteen pairs of these, 

 the first being directly over the axilla, the thirteenth inguinal. A 

 fourteenth lies directly over the axis of the femur when the leg is 

 extended at right angles to the body. Anterior to the axilla are 

 two more incomplete grooves close together. Somewhat irregularly 

 developed and ill-defined intermuscular grooves are continued for 

 the greater part of the length of the tail. 



The tail is five-elevenths of the entire length, quadrate at the 

 base, where it is broader dorsally than ventrally. While the 

 height remains nearly constant till near the end, the thickness 

 decreases rapidly, so that the posterior two-thirds are decidedly 

 compressed. The extreme end of the tail is slightly bent up and 

 terminates in a little compressed tubercle. A prominent doi-sal fin- 

 fold occupies rather more than its posterior half, reaching its 

 greatest height sixteen millimeters from the tip. Its free margin is 

 irregular and ragged, the result apparently of wear. A low dorsal 

 fold continues the fin-fold forward on to the base of the tail. A 

 much narrower ventral fold, which is highest posteriorly, extends 

 almost half the length of the tail. 



The limbs, especially the hind pair, are well developed. When 

 appressed to the sides of the body the fore limbs reach to a point 

 about half-way between the fifth and sixth costal grooves (counting 

 from the axillary), and the hind limbs similarly appressed reach 

 cephalad of the eighth costal groove, so that the extremities of the 

 two limbs are separated by two costal spaces. The fore limbs are 

 slightly depressed, the digits are long, slender and entirely free; 

 they increase in length in the following order: i, iv, ii and iii, the 

 number of phalanges being respectively 1, 2, 2 and 3. Each digit 

 is terminated by a slightly enlarged dark-brown horny nail which 

 is particularly conspicuous on digit i. No distinct palmar tubercles 

 are developed, but there is a deep groove extending from between 

 the second and third fingers, meeting a curved depressed line 

 which crosses the palm. 



The pes is large, broad and flat, with a small first digit and the 

 others long, slender, free and somewhat flattened. Digit i is less 

 than one-half the length of v, then ii, iv and iii become succes- 

 sively longer, but iii and iv are nearly equal. The number of 



