1899.] NATURAL SCIENCES OF PHILADELPHIA. 319 



above the axilla, and may be traced about half-Avay along the tail. 

 The segmental organs are generally one near the anterior border 

 of each costal fold, though some of the anterior somites present 

 two. The dorsal series is very incomplete and disappears on the 

 tail and middle trunk region. The ventral series of sense organs 

 is complete on the trunk somites, several of the anterior and pos- 

 terior of which are provided with two organs each. On the sides 

 of the head a number of pores are aggregated in a rather large 

 patch behind and below the angle of the mouth. They are arranged 

 more or less into rows and are connected by a transverse line across 

 the occipital region. A line of pores extends forward along the 

 lower jaw and a shorter one on the upper jaw. 



The color pattern is rather characteristic. The ground color is 

 a decidedly yellowish buff, everywhere more or less thickly marked, 

 except on the ventral surface, with irregular confluent blotches of 

 black, sometimes distinct, sometimes obscure. On the parietal, 

 frontal and rostral regions the ground color strongly predominates, 

 while the whole occipital and nuchal regions are heavily blotched. 

 On the base of the dorsum of the tail the color pattern takes the 

 form of large blotches of the ground color in a network of 

 black. Extending on to the sides of the body and tail the two 

 colors become interdiftlised, producing a gray color with small light 

 yellow specks. The ventral surface is pale yellow, largely pure, 

 but becoming clouded on the tail, pelvic region and throat. The 

 dorsal and ventral surfaces of the limbs are colored respectively 

 like the corresponding surfaces of the body. The toes are tipped 

 with brown. 



Of all regions the palate has the most characteristic appearance. 

 Inside of the narrow vertical alveolar margins of the jaw which 

 bound it, it presents a broad, perfectly smooth, unbroken and 

 almost flat surface — a low unarched roof to the mouth. There is 

 no shelf or fold of the integument Avithin and parallel to the alveo- 

 lar margin, no median pit and no trace of palatine teeth, the 

 region usually occupied by the latter being perfectly smooth and 

 flat. More remarkable still are the choanse. These are minute 

 slits lying between the anterior outer margins of the orbits and the 

 maxillary tooth line, and consequently diverging posteriorly, where 

 they are separated by a distance twice that between the external 



