MOLLUSCA. 81 



Order COPEPODA. 

 Family CYCLOPIDAE. 



Specimens of Cyclops seemed fairly common in the cave stream. 

 Only two attempts to collect them were made, and the following species 

 were taken in small numbers: 



Cyclops virldls (Jurlne) var.? 

 Histoire des Monocles, 1820, 46, pi. 3, fig. 1. 



Cyclops vlridls brevlspinosus (Herrick). 

 Geol. and Nat. Hist. Surv. of Minn., 12th Ann. Rep., pt. v, Crustacea, 1884, 192, pi. 30. 



Cyclops blcuspidatus Claus. 

 Archiv f. Naturgeschichte, July, 1857, Bd. 1, 209, Taf. xi, figs. 6 and 7. 



Canthocamptus illinolsensls Forbes. 

 Bull. 111. Mus. Nat. Hist. No. 1, 1876, 3, 25. 



According to A. S. Pearse, who identified these species, all are very 

 common species and appear to have normal eyes. They could easily 

 reach the cave straem by following up the outdoor stream as Copepods 

 very readily do. A blind fish's stomach contained one of these animals. 



Copepods were found in the waters of Mammoth and Twin caves. 

 Cyclops cavernarum and C. learii, species without eyes, are reported 

 from an artesian well at San Marcos, Texas (Ulrich, 1902, 95) . Several 

 species of Cyclops are found in European caves. In some of them the 

 pigment is considerably reduced and two of them are described as eye- 

 less, but Hamann (1896, 248) thinks without sufficient grounds. C. novse- 

 zealandise, a normal terranean form, has been obtained from wells in 

 New Zealand (Chilton, 1894, 247). 



ANNELIDA. 



Earthworms are rather common in Mayfield's Cave, occurring in the 

 soil from the mouth to "10" and very commonly from "10" to "15," 

 where there is considerable soil. They are occasionally seen along the 

 cave stream far back in the cave. Their occurrence is accidental. 



An unknown chaetopod was found crawling along on the bottom of 

 the stream at "41." 



MOLLUSCA. 



Slugs were occasionally seen in the cave, especially during the fall. 

 Many individuals of a small black one were seen on the walls and roof 

 near the mouth, while occasionally one was seen back as far as "17," 

 where it was noted on the mud or under debris. Two individuals were 

 seen at "42" on the floor, near bait. A larger mottled gray slug, probabl y 



