424 PROCEEDTNGS OF THE NATIONAL MUSEUM. vol. xxv. 



driftwood. The congregation at this point ma}^ have been due to the 

 presence of the driftwood, but this was also abundant in better lighted 

 locations and did not seem to be inhabited bv the cru:- taceans. 



C^CIDOTEA RICHARDSONiE Hay. 



It was contidentlA' expected that one result of the reexamination of 

 Nickajack Cave would ))e the collection of the various species of animals 

 described from this localitv by Packard/ l)ut it was not until the last 



day of my visit that 1 was 

 able to find what 1 sup- 

 posed to be his Cmcidotea 

 nickajackensls. A few 

 specimens were collected; 

 and on a critical examina- 

 tion it quickly became 

 evident that either the 

 description and figures of 

 Dr. Packard's C. nichi- 

 jacl'ends are altogether at 

 variance with the facts or 

 my species was a distinct 

 one. As Dr. Packard's 

 types have been lost, it 

 can not be satisfactorily 

 determined which is the 

 proper view to take; but 

 for many reasons, some 

 of which are given below, 

 the latter seems to be the 

 onl}^ acceptable one. 



Description. — A prelim - 

 inary description of the 

 new species was published 

 soon after my return to 

 Washington;^ but now that figures have been prepared, it seems 

 desirable to describe it in detail. 



To a certain degree the general aspect is that of C'. styghis; the 

 animal is slender, white, eyeless. The slender ness, however, is much 

 more pronounced, and the long, sprawling legs recall strongly certain 

 of the Ligiidx. The whiteness, and especially' the apparent frailty of 

 the bod}', is nmch more noticeable than in C stygius. 



The body is flattened quite as strongl}- as any member of the genus, 

 being slightly convex along the median line only. The greatest 



'Packard, The Fauna of Nickajack Cave, Amer. Nat., XV, 1881, p. 880. 

 ^J'roc. Biol. Soc. Wash., XIV, 1901, i). 180 {Vacidolea richanhonu) . 



Fig. 2.— C.ecidotea kichardson.« Hay. 



a Dorsal view of entire spec 



imen x 6. 

 h First antenna. 

 c .Second antenna. 

 d Mandible. 

 c First maxilla. 



/ Second maxilla. 

 g Third maxilliped. 

 ;* Upper lip. 

 i Lower lip. 

 ./ Gnathopod. 



