553 



and those of XI are similar in size to the others. The excretory and 

 nervous systems have the ordinary structures and relations. 



The spermaries and spermiducal funnels have the usual positions 

 and relations in X and XI and the spermiducal pores are on XV. The 

 terminal parts of the sperm ducts are surrounded by rather large 

 masses of gland cells which encroach on the cavity of XVI. There 

 are but two pairs of sperm sacs, one pair in XI and one in XII. The 

 various female reproductive organs have the usual positions and rela- 

 tions except that spermathccrc are entirely lacking. 



A comparison of the above description with that of Hclodrilus 

 giescleri (Ude) — see Ude ('95:127) — will show very close corre- 

 spondence throughout except in the position of the clitellum, which 

 in the latter species begins abruptly on XX instead of XXII. I have 

 specimens collected from the eastern parts of Florida by Mr. Adolph 

 Hempel which correspond very closely with Ude's description even to 

 the presence of the groove separating the clitellar part of XX from 

 that of the following somites. A few specimens in the same collec- 

 tion show but little clitellar development on XX, the strongly thick- 

 ened part beginning on XXI. I assume that these Florida specimens 

 are Helodrilus gicseleri. They have about 40 longitudinal partitions 

 in the calciferous gland as does the form described above. In view 

 of the connecting forms, there seems insufficient basis for recognizing 

 the new form as a distinct species, but because of the great uniformity 

 in the hundreds of Illinois specimens examined, there does seem to be 

 justification for treating it as a variety. No connecting forms have 

 been noticed in the Illinois material. 



DlPLOCARDlA SINGITLARIS I'XUVIATIUS n. var. 

 (PI. XLT, Fig. 4) 



Dcfimtion. — Color of living worm, strongly brown on anterior 

 dorsal surface. Length, extended, 60-100 mm. Diameter, 2-2.5 mm. 

 Somites, 100-120. Seta; of pairs rather widely spaced: posterior to 

 clitellum, 2^ a^ = 2ah = he =^ cd; dd = ^ circumference; ventral 

 seta; lacking on XIX; ventral seta; of XVIII and XX modified as 

 pcnial seta; ; spcrmathccal seta; not modified. Clitellum, XIII-XVIII ; 

 nearlv as thick vcntrallv as dorsally except on XVII and XVIII. 

 First' dorsal pore, VIII/IX or IX/X. Spermathecal pores, VI/VIT, 

 VII/VIII, and VIII/IX. Prostate pores on XVIII and XX. Sper- 

 miducal pores near anterior margin of XIX. Genital papillae paired, 

 near XVII/XVIII and XX/XXI. Septa VII/VIII and VIII/IX 

 strongly thickened ; IX/X somewhat less strongly, and V/VI, X/XI, 

 and XI/XII very slightly thickened. Gizzards in V and VI. Last 



