BY E. J. GODDARD. 727 



■developed papillae, the structures themselves being of slightly 

 more importance than the filiform papillae which occur along the 

 margin of the oral sucker of this species of Pontohdella. 



Against this idea, was held up the fact that the bodies had no 

 regular arrangement in any one individual. On examination 

 under the microscope, very little assistance can be derived, by 

 means of reflected light, with a view to fixing the exact meaning 

 of these structures. One can readily, however, make out a 

 swollen basal portion measuring 0*1 mm. in diameter, and cor- 

 responding to the foot-gland. The structures themselves resemble, 

 in miniature, the leech-host itself in shape, being much 

 attenuated at the distal end, where the calyx would be attached 

 (0'015 mm. in diameter), and thence increasing rapidly towards 

 the proximal end, so that, about mid-length, it measures 0-12 mm. 

 in diameter, and decreases but little till it reaches the foot-gland. 

 The greatest length of any one stalk was 0-72 mm. 



No traces of calices were found in connection with any of the 

 ■stems, and this unfortunate condition prevents one from making 

 any remarks in regard to the generic position of the form. There 

 is, however, every reason to suppose that a new genus is rep- 

 resented by these structures. 



Concomitant with the attenuated condition of the distal end of 

 the stalk, is the headless condition of the stalks, so that one may 

 •conclude that the calices very readily break away; and, further, 

 that, in all probability, regeneration does not take place. The 

 stem of all Entoproctous Polyzoa has a musculature which is 

 characteristic, so that the difficulty of drawing any definite con- 

 clusion of systematic value is enhanced. However, the habitat 

 of the form, and the fact that the form is a solitary species, enable 

 one to conclude, with some reason, that it has some affinity with 

 Loxosoma, which is a solitary form, and is found on Annulates, 

 although I can find no mention of its having been found in 

 association with any member of the Hirudinea. In Loxosoma, 

 however, the line of demarcation between body and stalk is not 

 well defined, the characters of the genus being given by Hincks 

 as " Polypides pedunculate, solitary, the body closely united to 



