196 COE 



region commonly much wrinkled and with numerous constrictions. 

 Posterior extremity not very slender. 



Body fragile, often constricted at the white rings described below, 

 and it is through these rings that the rupture usually takes place. 

 Several individuals broke spontaneously at the third ring, while the 

 rings in front and behind remained intact. This third ring seemed to 

 be the usual position of the first rupture. 



Mouth large, situated immediately behind brain. 



Proboscis pore subterminal, near ventral margin of terminal white 

 border. Proboscis slender, color very pale, with a tinge of yellow. 

 Proboscis sheath extends very nearly to the posterior extremity of the 

 body. Ocelli wanting. 



Color. — General color of dorsal surface deep chestnut brown, slaty 

 brown, purplish brown, or occasionally dark drab, the shade varying 

 considerably in different parts of body. Some individuals are choco- 

 late brown in esophageal region and are much paler brown posteriorly. 

 The under side of the body is sometimes dark brown like the dorsal 

 surface, but is usually paler, with a tinge of gray, and is occasionally 

 light drab. Those individuals which have the less deep coloring on 

 the dorsal surface have a correspondingly lighter tone on the under 

 side of the body. When the intestinal lobes show through they appear 

 to be still lighter in color. 



Head bordered anteriorly by a narrow terminal band of white which 

 also extends back along the borders of the cephalic slits. The white 

 color extends back a little farther in the median line than elsewhere, 

 except on the margins. Sometimes the white color extends backward 

 to the posterior ends of the slits, both above and below, so that when 

 the slits are open they appear white in color (p1. xvi, fig. 10) . White 

 terminal border is a little less broad on ventral than on dorsal surface 

 and is less conspicuous owing to the paler color of the ventral surface. 

 Head is often paler brown in front of brain, much deeper brown an- 

 teriorly next the white terminal border, and is brighter red in the brain 

 region (both above and below) , where the rosy coloring of this organ 

 shows through the superficial darker brown color. 



A series of very fine white rings encircles the body at intervals 

 throughout most of its length. These rings occasionally show slight 

 thickenings in the dorsal median line, but this is not usually the case. 

 The first of these very narrow rings appears nearly as far behind the 

 brain as is this organ from the tip of snout. The succeeding rings are 

 commonly separated from each other by about the diameter of the body 

 in ordinary states of contraction. 



