vol,. XV 



iwc; 



^''] PKOCIOKDINCJS OK TirK NA'PfONAIi MUSEUM. 285 



or III*' loiiilccii males, only one possessed liooks on l)()lli tlictliird 

 and ioiiifli ])aii-s of I('-f;s; tlic- i«'st iia<l Micm on tlic tliinl \ni\r only, 

 Tn 1\vo cases, liowcver, the. liook on the fourtli pair <>f lej^s is I'epre- 

 sented by a, low, iilniost;' indistinyuisliable lnl»er<le. This is also the 

 ease with one oC the specimens (Vom Wyandotte, and very close to the 

 typical form. The tShiloh specimens with two pairs of hooks ha\e the 

 anteiior oni^s lather strong ami sonunvhat cniNcd toward the base of 

 the le^s. '^riie postei'ior ])air are about half the length of the anterior. 

 Tlie hooks of the other specim<'MS ai'e of the same form, but are .i;('ner- 

 ally not so strongly (lev«'lo|)e(l. '^Phe specimens w ith ji sinj;le pair of 

 hooks pr(»bably belong to the second form <»f Ha^^cn. 



It may also be stated that, as a. rnh'-, (■aiulxinis pclliiciihis is smoother 

 the III rt her north it occurs. Tluj material \vlii(;h F have collected myself, 

 and all that I have been able to obtain from others, will njthohl nn^ in 

 this Ktatemeiit. 



The small cave m^ir Wyandott*', produces individuals of ex<^eediug 

 s])ininess, it beinji the excejdion to tind ther(^ a (comparatively smooth 

 one. 



ComiuiH' liirtli(!r north, to I'aoli, we can iiml miu-h smootluM- speci- 

 m(!ns, and at Shiloh they are smoother still, while at Maytiehl's Cave, 

 in Monroe ( "ounty, oecuis a form entirely without spines. So constant 

 is this feature of smoothness in the Maylield (!ave specimens and so 

 dilferiiut, is its apjH'araiice from the typical pel lucid us, that 1 think it i» 

 worthy of beinj;' ('haiaetfUMzed as a subspecies. 



Cambarus pellucidus testii, kiiI)s]i. hov. I'l. \i.i\. 



CnmlKtrnn ixlhicidun l':irl<;n(l. .M()ii(»;;r;i|)li (';i\c Animals of X. A., Mem. Nat. A('iut. 



Sci. \'<)1. i.\, No. !t., ji. Jt). 

 ('aiiilxiriiH jx'UiiridHH Faxon. Notes on N. A. (JrayfislicH, I'roc. I'. S. Nal. Miiiscnm, 



Vol. Ml, ]). t>21. 



My attention was first diawn to llic p<cculiar foini of blind craylish 

 from Mayfield's (lave, by my friend, Mr. Frederick (J. Test, of the U.S. 

 National Museum, wiio sent nu' three s)»ccimcns collected by hiiu in 

 1 sss. 



On aecoiint of the pres(Mice in these sjx'cimc^ns ol" hooks on only tlie^ 

 tiiird pair of lej^s of tiie male, ami other peculiarities, I was mm-h in- 

 clined to think that they l»elon;;('d t(» an entir<'ly new and undescrib(Ml 

 si)e(;ies, and it was foi- the exprciss purpose of collectino ;ulditioual 

 speciimms that- MayliehTs ('ave was visited by nu^ 



The craytislu^s are not very abundant, only nine Ix'in^ taken. They 

 ranged in lenjith from -\ to (iS millimeters. Six were males ami tliice 

 females. 



They dili<'r from ('. pcllucUlns in the }4'reat redact ion of t he spines. 

 Instead of beinj^' rou^di and very sjtiny, as the typical specimens from 

 Mammoth (Jasc, ate, d<;sciib(cd as beinj;-, they are entirely smooth. 

 The lateral rostral spiiu's are wholly gone, the post-orbital ridges are 



