Uuppell's Neue Wirbelthiere. 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, Rupp. 
Tab. 2, and C. olivacea, Eschscholtz, Tab. 3. Agama colonorum, 
Daud. Tab. 4. Stellio cyanogaster, Rupp. Tab. 5. Trapelus flam- 
mnculalus, Riipp. Hemidactylus flav i-viridis, Riipp. ; and Pristurus 
flavipunctatus, 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 integro : 
dentes maxillares integri aequales, 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 Riippell 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, duse anteriores spinosae. Pinnae 
ventrales thoracici, 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 praeter spinas ad latera pinnas dorsalis et analis, quae tactu 
sed non visu conspicuae sunt. Allied to Equula. Species, Gazza equulcefor- 
mis, Riipp. 
PseudochromiS) Rupp. Char. Gen Dentes in utraque maxilla uniseriati, 
minuti, conici, antice fortiores, irregulares, uncinati ; dentes palatini sphaeroidei 
minutissimi, triplici plaga dispositi, arcum semilunarem aequantes ; dentes pha- 
ryngei uncinati, setiformes ; rictus oris minutus. Labia mediocria ; os non pro- 
tractile ; operculum angulo postico elongate, preoperculum margine integro 
utrumque squamis minutis tectum ; apertura branchialis sub gula continuata ; 
membrana branchialis radiis sex. Linea lateralis interupta ; radii tres airte- 
riores pinnas dorsalis et analis spinosi, reliqui flexibiles. Allied to Julis, Cuv. 
Species, Pseud, olivaceus, flavivertex, Riipp. 
Xenodon, Riipp. Char. Gen Dentes in utraque maxilla 8, ordonati, coin- 
