40 THE SHORTER SCIENTIFIC PAPERS 



served fixed to the anterior end of one of the individuals, 

 the peduncle being less than 2/a in length. 



NAIS PARVISETA n. sp. 



Prostomium narrow, slightly acute. Eyes present, 

 round or slightly oval. Digestive tract differentiated into 

 a distinct pharynx which gradually merges into an esoph- 

 agus. Stomach dilation scarcely perceptible. Dorsal 

 bundle beginning on the 6th segment, composed of 1 

 capilliform, subequal to diameter of body, and 1 short 

 biuncinate seta, possessing equally developed teeth and an 

 indistinct nodulus. Ventral bundle composed of 3 to 4 

 biuncinate setse, with lower tooth considerably larger than 

 the upper tooth. Length 3.5 mm. Number of segments 

 in an individual 19 to 20. 



Cedar Point, Sandusky, Ohio. 



A very few specimens of this form were observed. Bud- 

 ding was noted in nearly all of the individuals examined. 

 The characteristic differentiation of the teeth on the 

 ventral setae appears to be of considerable specific im- 

 portance. 



NAIS TENUIDENTIS n. sp. 



Prostomium blunt. Eyes absent. Digestive tract not 

 differentiated into esophagus or stomach, covered with 

 many brownish globules. Dorsal bundle beginning on 

 6th segment, composed of 1 capilliform, the length (180 

 fi) of which is approximately one half the diameter of 

 the body, and 1 short (60/x) biuncinate seta possessing 

 equally developed teeth and provided with a nodulus. 

 Ventral bundle consisting of 4 (3 in several anterior bun- 

 dles) deeply bifid setse, both teeth being exceedingly long 

 and slender, the upper measuring 20 /jl and the lower 14/x 

 from the base of the cleft area. Length 3 to 3.5 mm. 

 Number of segments in an individual approximately 20. 

 Budding observed. 



Cedar Point, Sandusky, Ohio. 



Only two specimens of N. tenuidentis were found, 

 budding occurring in each. The extremely long and 



