170 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY 



minute dots. Commonly seven to fifteen of the fine lines, of which 

 the one in the median line is the most distinct and connects the 

 transverse, diamond-shaped yellow markings (PI. 3, fig. 36). 



Peculiar coloring on tip of head especially characteristic, consist- 

 ing of a narrow terminal border of white enclosing two oval, orange 

 colored spots imbedded in an area of lemon yellow. Sometimes 

 with a few dark brown dots in the yellow color. 



Body black or slaty after preservation, often without indications of 

 the characteristic markings seen in life. 



Proboscis very long and slender ; salmon or flesh colored ; pro- 

 vided with two muscular layers only, the internal longitudinal 

 muscles being wanting. 



Pigment of body situated in a very dense laj^er of minute granules 

 immediately beneath the epithelium. 



Cutis glands massed in a distinct layer just beneath the pigment 

 layer, not extending among the fibers of outer longitudinal muscles. 



Cephalic glands voluminous, extending back both dorsally and 

 ventrally nearly to the brain. 



Alimentary canal. — Esophagus remarkably short in comparison 

 with length of body, constricted at posterior end to form a sphincter 

 which opens into a widened posterior chamber or stomach of even 

 less extent than esophagus proper. Change from esophagus to 

 stomach very abrupt both anatomically and histologically, yet it is 

 quite impossible to determine exactly where the stomach ends and 

 the intestine proper begins, the cells of the axial cavity of the intes- 

 tine retaining the appearance of the stomach cells for some distance 

 posteriorly. 



Blood system. — In region of stomach there are five large blood 

 vessels in a transverse section of the body — the rhynchocoel vessel, 

 the pair of lateral lacunae situated in the angle between stomach 

 and proboscis sheath, and the pair of ventral vessels situated latero- 

 ventrally beneath stomach. At the beginning of intestinal region 

 the lateral lacunae pass ventrally to join the ventral vessels, which 

 continue to posterior end of body. Rhynchocoel vessel passes 

 beneath proboscis sheath at beginning of intestinal region. 



Nephridia very limited in extent, being found only in the middle 

 half of the very short esophageal region ; with a single pair of 

 efferent ducts opening dorso-laterally. 



Peripheral nerves remarkably conspicuous, the cephalic and 



