2('G i\Ir. (). Thomas on the 



Platk VI. 



Fi<i. 1. Third pnisom.itio appendflfre of 7V/c/i///)/eM* /////«.•!, c?. 



Fi<j.'2. Abnonuiil dnsper of J'dchyplcus fridcnfitfus, ^J, retftiiiiii}; tho 

 (li.*tal oxtivmity of tlie imiuovablu fiiifriT and illustrating,' tlio 

 fi.rniation of the lieniichelate from tlio cliflite condition. 



70// 8. Third pro^oniatic api)enda^e of C(irti/t(>xcor/)iii'< rntititdicainla. 



Fiij. 4. Sixth appendage of Tmhypk-us yitjas, witli spur (.sy>.) on fourth 

 sefiuu'nt. 



Fl<f. 5. Ditto of C(trcinoscorj)ius rotundicnnda, sliowiu;^ absence of spur. 



Fiy. 0. Endopodit^i of branchial appeudijje of '/'. !/i;/as, sliowing tho sen- 

 sory or^an.s and absence ot spine on penidtinuito se^rnient. 



ivy. 7. Inner edjre of last and ponnltiuiate segments of endopodito of bran- 

 chial appendaf^e u^ Xipltusutut pulnphvmu^, showing spine {t<p.). 



N.B.— In the Quart. Journ. Micr. Sci. vol. xliv. p. L>98 (1001), I drew 

 attention to the presence ou the four posterior pairs of prosoniatic 

 appendages in Z»>*/t/;« of a suture marking tiie original division of the 

 fourth segment into two, thus bringing the number of leg-segments in 

 Scor))ions and Limulus into exact agreement. My regret at having 

 overlooked the fact iliat M. Laurie (Ji>urn. Linn. Soc, Zool. xxv. p. .'$7, 

 18iU) mentioned the same feature is lessened by the recognition of the 

 value that attaches to the independence of the testimony. The credit of 

 the discovery of this suture belongs apparently to Ilanzani (Opuse. Sci. 

 Bologna, ii.'p. 279, pi. viii. tigs. 2, 7, .t 8, 1818), as stated by Vau der 

 Iloeven. The latter, however, omits the sutures from his plates. 



XL 1 1 1. — On the Geographical Races of the Kinkajou. 

 By Oldfield Thomas. 



'I'lit: Kinkajou [Polos Jiavus, as Mr. Pulincr has shown its 

 iiiune to be, bettor known as Cercoleples caudi vol cuius) is 

 spread over Central and Northern South America from 

 Mexico to Ecuador on the west and Guiana on the east ; but 

 the specimens from these different regions are not all precisely- 

 alike, and a comparison shows that five definable subspecies 

 may be readily distinguished. These may be briefly indi- 

 cated as follows, more detailed descriptions of the new forms 

 being subjoined : — 



1. Potos jiavus aztecus, subsp. n. 



General colour greyer ; between "tawny olive" and " ehiy- 

 colour " of Ridgway. No dorsal streak. 

 Mexico and Guatemala. 



2. Potos f. megalotuSj ]\Iart. 



General colour deeper and stronger, about raw sienna of 

 IJidgway. A dorsal streak usually present. 

 Costa Ivica and Colombia. 



