fjS COE 



tissues surrounding the rhynchodseum and blood lacunae, but are sepa- 

 rated from the more superficial glands of the cutis by the rather thick 

 layer of fibrous tissue which constitutes its inner portion. This line 

 of separation is more marked on the dorsal than on the ventral side of 

 the head. In the brain region the cephalic glands occupy a large por- 

 tion of the longitudinal muscular layer on all sides of the body. In 

 the region of the mouth they become more scattered, and He mainly on 

 the right and left sides, although they extend Inward to the inner por- 

 tion of the outer longitudinal muscular layer. Posterior to the mouth 

 they are limited to the middle portions of the outer longitudinal mus- 

 cular layer ventral to the lateral nerves, and occur only sparingly. 

 They cease entirely a short distance behind the mouth. 



The cu^is is thick and, as in related species, consists of two con- 

 spicuous layers — an outer, glandular layer with closely packed, deeply 

 staining gland cells, and an inner, fibrous layer consisting largely of 

 interlaced connective tissue fibers. The cutis is several times as thick 

 as the Integument, and between the two lies a rather conspicuous 

 layer of muscular and connective tissue fibers forming a basement layer 

 for the Integument. 



Alimentary Canal. — As stated above, the mouth Is remarkably 

 distensible, appearing when contracted as a small round pore, but 

 when distended Is a large and long slit with tliickened lips. The 

 posterior end of the esophagus becomes much widened before It joins 

 the Intestine, and Is peculiar In that it does not pass smoothly Into 

 the latter. The anterior end of the intestine proper is narrow, and opens 

 into the widened esophagus immediately beneath the proboscis sheath, 

 while the esophagus continues backward as a broad blind sac for 

 some little distance, surrounding the lateral and ventral walls of the 

 intestine. A section through this region, therefore, shows a rather 

 small intestinal canal, surrounded, except dorsally, by the thick 

 glandular walls of the broad, caecal portion of the esophagus. 



Blood and Nephridial Systejns. — Cephalic blood lacunae, lateral 

 vessels and esophageal lacunae as usual. Proboscis sheath vessel con- 

 tinues within the rhynchoccel nearly the whole length of the esopha- 

 geal region. Nephridia remarkably extensive, originating a short dis- 

 tance posterior to the mouth and extending nearly the whole length 

 of the esophageal region. The efferent ducts are numerous, but of 

 small size. They are scattered at irregular Intervals along the whole 

 length of the esophageal region, and, as usual, pass to the exterior im- 

 mediately above the lateral nerves. In the single specimen sectioned 

 there were eight to twelve of these ducts on each side. 



