Riippell's Neue Wirbeltliiere. 279 



place in the form of the shield at the different periods of their growth, 

 and in the number of plates of the shield and the head of the ani- 

 mal, indifferent specimens of the same species. Carretta bissa, Riipp. 

 Tab. 2, and C. olivacea, Eschscholtz, Tab. 3. Agama colonorum, 

 Daud. Tab. 4. Stellio cyanogaster, Riipp. Tab. 5. Trapelus jlavi- 

 macitlatus, Riipp. Hemidactylus Jlavi-viridis, Riipp. ; and Pristurus 

 Havijninclatus, Riipp. Tab. 6. are all interesting, as being figured and 

 coloured from the living animals. And the genus Pristurus, appa- 

 rently belonging to the slender-toed Geckoes, and very peculiar for 

 having a long, much compressed tail, serrated on both its edges, is 

 now described and characterized for the first time. 



Pristurus, Riipp. Char. Gen Caput subdepressum, breve, antice rotundatum : 



Nares laterales prope apicem rostri : oculi magni, pupilla nocturna, subrotun • 

 da : membrana tympani profunde latens : lingua crassa, depressa, apice iutegro : 

 dentes maxillares integri asquales, uncinati • cutis trunci sublaevis, subtilissime 

 reticulata : pedes pentadactyli, digiti graciles, rotundati, elongati, uncinati : Cau- 

 da compressa, elongata, supra et infra carina serrata : pori femorales nulli. 



Of the fishes, forty-six species are described and figured in the two 

 numbers already published, most of them are coloured from the fish 

 when alive. Among them are what Dr Ruppell considers the types 

 of four new genera, of which we shall add his characters. 



Enneapterygius, Riipp. Char. Gen — Caput alepidotum, preoperculum carinis 

 duabis, operculum supra pinnas pectorales elongatum. Os labiis carneis, denti- 

 bus setaceis minutissimis per multis armatum, membrana branchialis sub gula 

 continuata, radiis 7. Corpus squamis magnis, margine serrato ; linea lateralis 

 sola parte anteriore expressa, pinnae dorsales tres, dua? anteriores spinosa?. Pinna? 

 ventrales tboracici, radiis binis veluti Blennii. Allied to Scorpaena. Species, 

 Enneapt. pusillus, Riipp. 



Gazza, Riipp. Char. Gen — Corpus compressum, cute squamis minutissimis 

 tecta ore mediocri, multum protractili, unica serie dentium uncinatorum ar- 

 mata, e quibus nonnulli fortiores elongati. Dentes palatinalis et vomerales nulli 

 preoperculum margine duplici, externo parte inferiore serrato. Characteres re- 

 liquis generis Equula pra?ter spinas ad latera pinna? dorsalis et analis, quaa tactu 

 sed non visu conspiciue sunt. Allied to Equula. Species, Gazza equulcefor- 

 mis, Riipp. 



Pseudochromis, Riipp. Char. Gen Dentes in utraque maxilla uniseriati, 



minuti, conici, antice fortiores, irregulares, uncinati ; dentes palatini spha?roidei 

 minutissimi, triplici plaga dispositi, arcum semilunarem aequantes ; dentes pha- 

 ryngei uncinati, setiformes ; rictus oris minutus. Labia mediocria ; os non pro- 

 tractile ; operculum angulo postico elongato, preoperculum margine integro 

 utrumque squamis minutis tectum ; apertura branchialis sub gula continuata ; 

 membrana branchialis radiis sex. Linea lateralis interupta ; radii tres ante- 

 riores pinna? dorsalis et analis spinosi, reliqui flexibiles. Allied to .Tulis, Cuv 



Species, Pseud, olivaceus, flavivertex, Riipp. 



Xenodon, Riipp. Char. Gen — Dentes in utraque maxilla 8, ordonati, com- 



