CRUSTACEANS OF NICK A. TACK CA VE—UA Y. 



42' 



nearer approach to the genus Asellus than that of .Mammoth and Wyandcjtte caves. 

 On the other hand, C. stygia approaches Ase/lnx more in its shorter, Iwoader body, 

 with the shorter, broader abdomen. It seems (juite evident that the two species 

 must have descended from different species of Aaellus. Whether there is an addi- 

 tional species in the Southern States from which the present species may have been 

 derived remains to be seen. 



From the above description it would seem that the chief difi'erence 



l)etween (\ ii!ch(jach:'u,^lK and C. r!<'Jiar(h<ma' 



Hes in the character of the uropods, ])ut a refer- 

 ence to the houres accompanyino- Dr. Packard's 



description shows several more important char- 



ai^ters in which this species do not correspond 



with the present one. The tirst antenna are 



short and have a iiagellum composed of not 



more than seven segments; the present species 



has about fifteen. The outline of the head and 



body is quite different, though this may ))e due 

 to fault}" drawing. The 

 shape of the telson is very 

 different, being much 

 longer in proportion to 

 the knigth of the l)ody 

 and its own width than 

 in C. richardsonx. 



During my examina- 

 tion of the new" species 

 Miss Harriet Richardson 

 kindly furnished me with 

 specimens of an eyeless 

 Ccecldoten from Metcalf, 

 Georgia, which she has 

 identitied as C. nlvl-njachmalx Packard. 



It seemed rather improbable that the species 

 should appear in two localities so far apart as 

 the northern and southern limits of the State of 

 Georgia, but a careful comparison with Pack- 

 ard's description and figures showed that it 

 coi-responded ver\' well, although differences 

 are still to be found in important characters. 

 Regarding them, in the absence of better 



proof,' as C. ntcJcajacl-etisis Packard, we tind the following differences 



between C. richardsona' and C. nichijackev-^/x: 



C. nickajache'n.^h has the tirst antennae shorter, composed of about 



^The Metcalf specimens may represent a distinct species, in whic-h case it may be 

 known as C. troglodi/tes. Type, No. 2618(>, LT.S.N.M., Metcalf, Georgia. 



U.ECmOTEA NICK - 

 I ACKENSIS, METCAI.K, GEOK- 



fus. 4.— c.eciaotea stygia 

 Packard, Mammoth Cave. 

 Kentucky. 



