422 PROCEEDINGS <>F THE ACADEMY OF [18 < •"> 



single small hunch in the median region of each lip is all that is 

 present. 



The jaws are remarkable, and although large, are inconspicuous 

 on account of their transparency and lack of color. On the dorsal 

 one, which is much the larger, a high median ridge is developed, 

 which hears three strong teeth, the points of which are directed 

 posteriorly (down the throat). The ventral jaw is shaped like a U 

 each limb of which is bent out of the common plane into a boomerang 

 shape. The angle of the boomerang on each side is uppermost and 

 hears a very strong curved tooth, the two bounding a deep groove 

 which accommodates the dorsal dentigerous ridge. 



The stomach is comparatively small, and behind it the evenly 

 tubular intestine is thrown into loops, which become more obvious 

 with the greater degree of contraction of the animal. 



In connection with the vascular system is developed a remarkable 

 shallow sinus which covers almost the entire surface of the alimentary 

 canal. This presents dorsal and ventral longitudinal enlargements 

 into which the principal vascular trunks are received. The extensive 

 vascular surface with the contained bright red blood thus presented 

 gives the animals a delicate pinkish hue which distinguishes living 

 individuals at a glance from the other species herein described. 



In each of the nine post-cephalic segments is a pair of peculiar 

 translucent, glandular bodies composed of large nucleated cells, and 

 communicating with the exterior by slender ducts having ventro- 

 lateral openings. 



The anterior two nephridia open into a gourd-shaped vesicle having 

 an opening to the exterior in the mid-dorsal region of the major 

 annulus of the third segment. The spermatheca is short, cylindrical 

 and bifid ; the penis- sac short- pedicled and spherical, and the atrium 

 clavate and curved. The spermatheca, penis, ovaries, posterior paired 

 nephridia and anus open respectively on the fifth, sixth, seventh, eighth 

 and ninth post-cephalic segments. Length of full grown individuals, 4 

 mm., maximum diameter (7th segment) ■!) mill., diameter of aceta- 

 bulum -35 mm. The figure represents an individual of maximum 

 size. 



The cocoon is regularly ellipsoidal iu shape and bears an anchoring 

 pedicle at each pole of the major axis. Length of cocoon, -55 mm., 

 diameter, '40 mm., length of pedicles, "33 mm. 



This species is very common and has been found in the branchial 



