THE SKULL AND TEETH OF ECTOPHYLLA ALBA. 271 
Measurements of Ectophylla alba (in millimeters). 
Head and body (from crown of head to base of tail)... 36 36 
Men ot hpoisanmirenn cerca terrane scar mere atcctcine seameeiooecisciie ceccacioe tition caste celecs vce vena shade svcetestersevsiics 17 
IL@IGIN Ot TOREAI TT qeaosadsoanseda0.an9odbsedb0adg6n0s8094Geqshdd90s00N60d0K000 000 Jodo bco0desHSsodDnECHE AG DoS He SEnBBEDEAOOSOEe 25 26 
First digit : 
ent hvolsnirshame tacan pala On eseerspheecsenteecsanceimasce ses sscsteneeresreeetimesaes see seceeeessesseemececees : 3 3 
Length of first phalanx...........-- 3 3 
Second digit : 
Wencthvotsecondentetacanpalliib one ys eeeerteeer creer steerer cece enlaces eee sesereseiseereseneaseeeteeceere 21 20 
TLS ON THRE, THAT TAS oc soog3n50000s900030N= INS cao SoocONbonSSaaTEG2Goqsabsoco9qsaROveS>9aHNGNDBAD9S9GBe0000 HOBHaDAea 3 
Third digit : 
Length of third metacarpal bone.........- 25 25 
ILE GE aS TONE FATED 0053090000000 ssaDDaDoADDOAGOCODBEHEDHODSEdoONdoHSHODoSENcHOADScROBOeSHASEAaEHAGIS 9 
ILemaHn @ii S@COMEl TRAN, soocec cov e3c000n0009s900099c3000R00080800 neagdaNDSSoODDoGONSOD oADeooAoeSAANGACES HoaHSo90a 12 13 
ILEWSUN Oi WantREl TNA eva CeccosoHoaconsdoooono5coaeINaESDDOGNbSONoROnOSCASDDKDDN|AGOGG soNEEHoSDHEOLOdesADoaEeDeGouAS 6 6 
Fourth digit : 
Length of fourth metacarpal bone 25 25 
Meno thyotuirstaphalamxerscyeccades veces ose de eeicishae cinch anced ene mare ueeseunaec ce acca sene ae soecee? sant 7h 8 
ILEMAWA Oi Seeded! [MAMI .coccnacsooocoGseDoGASEABOOBEOCHESoDUA SoBNSooogonnScoRaSDoDNEgOIBAALONATeREDEOgOSUDNeS 8 7 
Fifth digit : | 
‘Length of fifth TEASE EN! INO, paovoboodcongkosossoass0nGenbon 7OSG9nONEGERO anEDosONH/-aagodaDRoOEsCORONanDOGaeOD 25 ? 
Length of first phalanx.. 6 6 
ILemaWn OF SecouGl Tp ogee, coosopon20096590Racoa9Hoas nonDobsbopadeooosnHocHosHoo;endDoRSopSsOGASHADBORSoEHOODE Anae 7 ri 
ILE HD OF VEAL ceosenodasccsen600399c00905000 099 D500N00090000d0s NoNDOS NSESEES OED gBOsOSAOIcCoGNOoOOoRGNOSHOS PoaDbosaneHooAeaDAG 14 14 
JEIGREING @E © JProsccsaqnedancoconesecoq das pss bos0Hbo0000¢bac0000000 00500 aod ObUDDUsHAIGHE teEoRAODODDAESHOSeOUSbOARsODHsoGovOHONONS 10 10 
TEIGTEINE OF WREGWE .000900900060 on00000c0 0900900990000d000000000000950020000-,eaqD0D60 DonooDOINOTODOAGENNSNNOROHO SoncvasoROseDABHeE 5 2 
Length of t. igh.... 8 i 
ILEMAIN OP HDI, coocococcecas oscosonon donc coseaa0cnqqCnObESURCBSCONDABROSaqOCaD0 EqDNSIDDboaENcHDLAGOHDOOOD ScHoCODONDOTAGUOnEOTE » 10 10 
Length of foot ........ poo soaseso99eecbapcaDoDUaR ADDED DODHOUDEESORCO EDU DOONoDEANOCOORD.SoDAcHOsedSedonSEDonaaEEuDaEEeoSRaCRENcaS 8 8 
Length of interfemoral membrane........... SCORE GUE SNHSGABEAdoOSGnED. cosdacHaonbacoonaDoode Load bHebsaenEoooecanereones 4 4 
In concluding the account of this interesting specimen, I will call attention to the 
molar teeth of Cephalotes, a member of the remote group of the Pteropodidee. The two 
genera, however, resemble one another in being frugivorous, in retaining few or no 
tubercles to the molars and, probably on this account, in exhibiting elongated crests in the 
centre of deeply excavate crowns. A tenable hypothesis for the origin of this central cusp 
may be expressed as follows. The grinding away of the crowns has gone on to a degree 
that brings the enamel cap down near to the division in the alveolus, between the sockets 
for the roots of the teeth, so that this ridge acts as a point of resistance to further wear 
and leads to a reassertion of the principle of cuspidation at this point, 
A. PB. S.——Vow. XIX. 21. 
