Mr. J. E. Gray on the Slender-tongued Saurians. 331 



acute bractea. Sepals equal, broadly oval or nearly orbicular, 

 very concave. Petals Ungulate, obtuse, slightly concave. Lip 

 equal in length with the petals, divided to the middle into three 

 obtuse segments, of which the middle one is the largest and 

 broadest : the centre of the lip is clothed with a broad line of 

 dense glandular down, reaching from the base almost to the 

 apex. Column much shorter than the perianth, thick, fleshy, 

 rhomboid. Anther hemispherical. 



Plate XVII.* A. Stelis foliosa, nat. size ; fig. 1, flower-bud ; fig. 2, 

 flower expanded, in its natural position ; fig. 3, the same inverted and more 

 expanded ; fig. 4, column ; fig. 5, petals ; fig. 6, labellum ; fig. 7, side view 

 of the labellum ; fig. 8, pollen masses, magnified. 



XXXVIII. — Catalogue of the Slender-tongued Saurians, with 

 Descriptions of many new Genera and Species, By John 

 Edward Gray, Esq., F.R.S., Senior Assistant in the 

 Zoological Department of the British Museum, &c. 

 [Continued from p. 293.] 



Dasia. Toes 5 — 5, short, lower joint rather thick, with transverse 

 plaits beneath, upper ones compressed and slightly arched; the index 

 and middle finger equal, the next finger a little shorter, thumb large ; 

 ears closed over by the scales, not apparent (nor apparently fringed) ; 

 muzzle short, rounded ; tail tapering. 



Dasia olivacea. Olive, back of the head- shield black ; the back 

 with 1 2 cross series of scales with a central white spot and a black 

 spot on the sides ; the band sometimes interrupted ; scales 3 or 5 

 keeled, 3 or 5 toothed behind, the 2 lateral keels close together ; 

 hinder part of the sides, and sides of the tail with 2 broad white 

 streaks ; chin and beneath green, not spotted. 



Prince of Wales's Island. Mus. Chatham. 



Aprasia. Head small, with 2 pairs of rather large frontal shields, 

 which also cover the cheeks ; a large 6 -sided elongate vertebral, and 

 a pair of small superciliary, shields ; labial shields rather larger, few ; 

 eyes large, round, eyelids rudimentary, pupil round ; nostrils small, 

 in the suture between the top of the first labial and anterior frontal 

 plate ; muzzle rounded, rather produced. Ears none ; body cylin- 

 drical elongate, covered with uniform hexangular smooth scales; 



* This plate will form part of the Supplement. 

 z2 



