Species of Worth American Oligochceta. 407 



Microscolex hempeli n. sp. (PI. XXXVII., Fig. 13, 

 and PI. XXXVIII.) 



This species was represented by eleven specimens, most- 

 ly mature. They were found near Quincy, Florida, un- 

 der a manure heap. 



They are not jjigmented, but, like Eisen's Deltania spe- 

 cies, are pale and rather delicate. Alcoholic specimens 

 killed well extended are 35-55 mm. in length and 1-1.5 

 mm. in diameter. The number of somites in seven spec- 

 imens averaged 73, with extremes of G3 and 78. The 

 prostomium extends over about half the first somite. 

 The clitellum is upon XIII-XVII, but extends a short- 

 er distance upon the ventral surface of XVII than else- 

 where, the outline forming a sinus as in M. nova zelan- 

 dicB ('93, Beddard, Fig. 1). It is complete and nearly as 

 thick upon the ventral as upon the dorsal surface (PI. 

 XXXVIII., Fig. 14). Small genital papillae are present 

 but difficult to see upon the entire worms, and I 

 have studied them only upon sectioned specimens. Their 

 situation is quite variable. In one specimen there is a 

 pair of papillsB on X and a single one on XI; a second 

 specimen has them similarly placed on X and XI, and 

 also has a pair on XVIII; while a third specimen has 

 none on X or XI, but has a pair on the anterior part 

 of XVII. 



The setae are paired, and those of the inner couples 

 converge toward the male pore, as in the species in- 

 cluded l)y Eisen in his genus Deltania ('94, p. 22). 

 In the somites posterior to XIX (See Fig. 13, PI. 

 XXXVII.) the distance between the setae of a ventral 

 couple is almost exactly equal to that between the 

 setae of a dorsal couple, and is about two thirds of that 

 between those couples, and nearly as great as that be- 

 tween the ventral couples. Thus, calling the distance 

 between the inner setae (1—1) 12, then the distance be- 

 tween the setae of a ventral couple is 10, that between 

 the ventral and dorsal couples is 15, that between the 



