408 Illinois State Laboratory of Natural History. 



setae of a dorsal couple is 10, and that between a dorsal 

 couple and the mid-dorsal line is 22-24. In the anterior 

 somites the setae of a ventral couple are a little nearer 

 together than those of a dorsal couple. The dorsal 

 setae are i?i the dorsal half of the worm. Setae of the 

 usual shape and size occur in the clitellar region as 

 elsewhere (PI. XXXVII., Fig. 13). The ordinary setae 

 are about .16 mm. in length. The penial setae are nearly 

 four times as long, very slender, and slightly curved out- 

 ward. They are upon XVII, and are only one sixth as 

 far apart as those of the ordinary ventral couples. There 

 are no dorsal pores. 



The buccal cavity is everted in alcoholic specimens. 

 The pharynx is thick only upon the dorsal side (PL 

 XXXVIII., Fig. 17). In somite V, as shown by septa, 

 but pushed back to VI, as indicated by external divi- 

 sion, is a slightly developed gizzard {giz.. Fig. 17). This 

 has a layer of circular muscle fibers slightly thicker than 

 that of the body wall of the same somite, but not nearlj"^ 

 as powerful as in some Acanthodrilidae. The oesophagus 

 continues to XVI, where it joins the greatly enlarged 

 intestine. Septal glands are present in V-VIII, those 

 of VII and VIII being small, and those of V and VI 

 larger. Figure 17 was drawn from median sections, and 

 consequently shows only small parts of the septal glands. 



The first nephridia are in II, and those of II-IV each 

 have a nephridiopore anterior to seta 4. Those of V 

 and the following somites each open anterior to and a 

 little ventrad to seta 3, the nephridiopores being almost 

 exactly at the ends of the transverse diameter of a cross 

 section of the bod3^ They all possess a bladder or 

 vesicle next to the wall. 



The "hearts" are large and in X-XII. 



The testes have the usual situation in X and XI. The 

 small and slightly lobulated s])erm-sacs are in XI and 

 XII, and are attached to the anterior septum of their 

 respective somites a little below the oesophagus. The 



