Article XIV. — Notes on Species of North American OUgo- 

 chceta. II. By Frank vSmith. 



ILLINOIS SPECIES. 



The collections of Oligochseta made in connection with 

 the work of the Biological Experiment Station upon the 

 Illinois liiver, at Havana, contain about thirty species, 

 of which the greater number have been previously de- 

 Bcribed. Two species, one of which must be regarded as 

 belonging to a new genus, are described in this paper. 



Pristina leidyi n. sp. (PI. XXXV.) 



One of the most abundant species of Naidomorpha 

 occurring in the Illinois River at Havana is a member 

 of the genus Pristina, closely allied to P. longiseta Ehrenb., 

 but differing from it in certain characters of sufficient 

 importance to make it necessary to regard it as distinct* 

 In this view I am supported by Prof. Vejdovsky. who 

 has very kindly replied to queries upon the subject. I 

 think it may be the species described and figured by 

 Leidy ('50, p. 44, Fig. 3), and considered by him as 

 identical with the European species P. longiseta. 



Budding specimens are 4—8 mm. in length when well 

 extended, and sexually mature specimens about 4 ram. 

 The length given by Leidy for specimens measured by 

 him, viz., 1 line, may, I think, reasonably be supposed 

 to apply only to the part anterior to the budding zone, 

 since he states that the "body" is composed of sixteen 

 elongated "articulations," and his figure shows about 

 that number anterior to the budding zone. If this view 

 be correct, the whole length of his specimens would be 

 nearly 4 mm. P. leidyi attains a length of 8 mm. only 

 "when there is a chain with three or more budding zones. 

 The diameter is .1 to .15 mm. The proboscis is much 



