190 COE 



Especially characteristic is the peculiar coloring on the tip of the 

 head, and this has suggested the specific name. On the dorsal surface 

 near tip of snout is a narrow terminal border of white, and situated 

 within this white border are two oval, orange-colored spots imbedded 

 in an area of lemon yellow (pi. xvn, figs. 5, 6). Sometimes a few 

 isolated dark brown dots are scattered in the yellow color. In some 

 specimens the orange-colored spots are very conspicuous, while in 

 others they are very small and indistinct. Sometimes the yellow color 

 surrounding them is wanting, but the white terminal border is always 

 present on the tip of the snout, both above and below. 



After preservation in formalin the head becomes much contracted 

 and wrinkled, the cephalic slits become short, and the body assumes 

 a dull black or slaty color, without indications of the characteristic 

 yellow markings seen in life. 



Mouth large, with pale lips, reaching forward to the posterior ends 

 of the cephalic slits. 



Proboscis salmon or flesh-colored, very long and slender. 



Size. Usually about 15 cm. in length and 3-4 mm. in width, 

 although individuals were found as small as 15 mm. long, while a 

 single specimen measured nearly 50 cm. 



Proboscis. Provided with two muscular layers only, the internal 

 longitudinal muscles being wanting. There is a well-marked crossing 

 of fibers between the circular muscles and the outer fibrous layer, as in 

 many related species. 



Body Walls. Structure of body walls as in other representatives 

 of genus. The pigment which gives the dark color to the body is 

 situated as a very dense layer of minute pigment granules immediately 

 beneath the epithelium throughout the whole length of the body. It 

 is even present as a less distinct layer beneath the epithelium of the 

 cephalic furrows, and is lacking only in a narrow area immediately 

 surrounding the proboscis pore. This area corresponds to the white 

 zone seen in life at the tip of the snout. So dense is the pigment layer 

 that if ocelli were situated in it they would be very difficult to dis- 

 tinguish. They are probably not present, however, for they do not 

 appear in any of the sections. 



A rather thin layer of connective tissue is found beneath the cutis 

 glands, which indicates an approach to the condition of a true cutis. 

 The cutis glands are massed in a distinct layer just beneath the pigment 

 layer, and do not extend among the fibers of the outer longitudinal mus- 

 cles even in the intestinal region. They are usually distinctly, though 

 not widely, separated from these muscles by the thin fibrous layer. 



