272 bulletin: museum of comparative zoology. 



of dorsal surface. This color remained even after imbedding in 

 paraffin. Ventral surface without color. A specimen from another 

 locality showed no indication of the original coloring. 



Ocelli. — Numerous large ocelli lie on each side of head, but their 

 definite arrangement could not be made out. 



Proboscis sheath of strong, interlaced circular and longitudinal 

 muscles as commonly occurs in Drepanophorus, although such a 

 condition is very rare in the present genus. Proboscis not pre- 

 served in either of the s])ecimens. 



Cephalic glands fairly well developed. Submuscular glands 

 practically wanting. 



Basement layer of body walls well developed, in intestinal region 

 as thick as circular muscles and integument combined ; but httle 

 body parenchyma is present. 



Alimentary canal. — The peculiarities of the various portions of 

 the digestive canal will readily distinguish the present species fi'om 

 most other described forms of the genus. As shown in PI. 20, fig. 

 121, there is a caecal appendage to the esophagus and one to the 

 stomach in addition to the highly developed intestinal caecum. 

 Esophagus separates from rhynchodaeum near the tip of snout, but 

 remains of small diameter until posterior to brain. Here it enlarges 

 and is lined with a more columnar e])ithelium. A short distance 

 back of brain the esophagus branches into two portions, one of 

 which lies directly ventral to the other. The dorsal portion passes 

 by a narrow opening into the long stomach, while the ventral canal 

 retains the characteristic lining of the esophagus, but ends blindly 

 posteriorly. Such an esophageal caecum, as it may be called, has 

 been described and figured by Jovibin CSO, p. 564) for A. maxmora- 

 tiis, and occurs also in A. arctictis, Punnett (: 01, p. 94) . It is 

 found in two other forms fi'om the Pacific coast, as mentioned 

 below. In the present species the esophageal caecum extends back- 

 ward nearly to the most anterior sexual glands. In one of the spec- 

 unens it was still further com])licated by again bending forward 

 beneath its posterior portions as a rather narrow appendix (PI. 20,^ 

 fig. 121, app) . The cells of the appendix are somewhat modified, 

 are more glandular and stain more deeply with haeraatoxylin than 

 do those of the esophageal caecum proper. This caecum extends 

 posteriorly considerably beyond the anterior diverticula of the 

 intestinal caecum (PI. 20, fig. 121), so that a section through the 



