CROCODILIAXS, LIZAIiDS, AND SNAKES. 451 



tylKn, but it is present and free in Eublepharis. In >Spli(rr<><lact!jJuH 

 notatus I observed the exceptioniU character of a distinct digitifortn 

 lobe of the liver on the left side, which partly embraces the stomach. 

 There are two families of this superfaniily. 



Vertebra- iirocrelous ; pariotal bones united Eublephakid^e. 



Vertebra' amphicci'lous ; parietal bones separate Gekconid/K. 



These families are found in the warmer regions of both continents. 

 The species which they include are of insectivorous habits. I have 

 been able to examine the mesenteries in relatively few genera of the 

 superfamily. I find the structure to be of the type most frequent in 

 the Sauria; that is, a single hepato ventral; a single gastrohepatic; a 

 left gastro})ulmouary, and a right hepatic, which embraces the right 

 lung. 



This superfamily is most nearly allied to the Diploglossa in its pro- 

 duced petrosal and papillose tongue. The form of the petrosal is very 

 different, and the underarched frontals are very rare in that group, 

 while the expanded clavicles are like those of the Leptoglossa in. 

 general. 



GECKONIDy!^. 



(Jeckoliens Cuvier, part, Regne Anim., II, 1817, p. 50. 



Jacalaboto' Mevuiem, part, Syst. Amph., 1820, p. 39. 



Geckotida' Ghav, part, Ann. Phil. (2), X, 1825, p. 198. 



Jscalahoto'ido; Fitzingeh, part. None Classif. Rept., 1826, ]). 13. 



riatyfjJossa; 'WAGhKii, part, Syst. Aiuph., 1830, p. 141. 



Ascdlahottv Wiei;mann, part, Herpt. Mex., 1834, p. 19. 



Geckotkns or Ascalahoies Dumf.rii. and BiHUOX, part, Erp. Gi-n., Ill, 1836, i>. 237. 



Ascalabolw Fitzingeh, part, Syst. Rept., 1843, p. 89. 



Geckotida- Gkav, part, Cat. Liz., 1845, pp. 5, 142. 



Gecconidd Cope, part, Proc. Am. Assoc. Adv. Sei., XIX, 1871, p. 236. 



Gcchomdw Bon.ENGEH. Ann. Mag. Nat. Hist. (5), XIV, 1884, j). 119. 



Coronoid bone produced anteriorly and posteriorly on external side 

 of ramus. Surangulai' wanting. Angular largely developed exteriorly, 

 not interiorly. Splenial elongate; ^leckel's cartilage covered between 

 the splenial and internal mental foramina. Premaxillary broad, in 

 contact with vomer. Pterygoids not touching sphenoid. Frontal 

 arching under olfactory lobes. Parietal bones distinct: attachment of 

 occipital segment very open; gomphosis internal. Petrosal with ante- 

 rior vertico-obli(iue ring; superior plate produced beyond anterior semi- 

 circular canal, forming abutnuMit for columella. Postorbital osseous 

 bars incomplete. Tongue i)apillose, no part retractile. 



I have examined the hemii)enis in the genera Thecadactylux, PUitydac- 

 ti/liis, J'hyUodactylKs, and (hjmnodavtylus. In these this organ is short 

 and wide, approi)riately to the fragility of the tail at a point Just beyond 

 the base. It is also more or less deeply divided into two branches. 

 The entire surface is calyculate, generally minutely. In Thecadaciylns 

 each fork has three strong welts. In PlatydactyJus there is a welt 

 opposite the sulcus, which is very large in /'. (vgyptiavm, and divides, 



