1889.] ON LIZARDS FROM THE MUSEUM OF HALLE. 143 



Plesiophysa, Fischer, 1883. 



Animal unknown, with the exception of the radula ; central tooth 

 5-cusped ; middle cusp the largest ; laterals 4-cusped, strong ; 

 marginals as the laterals. 



Shell that of a Physa, fragile. 



Distribution. Guadeloupe. 



2. On some Specimens of Lizards in the Zoological Museum 

 of Halle (Saale), By G. A. Boulenger. 



[Eeceived March 6, 1889.] 



(Plate XV.) 



Having, at the request of Dr. O. Taschenberg, examined some 

 specimens of Lizards belonging to the Museum of Halle, which have 

 been named or described bj Burmeister and Giebel, I beg leave to lay 

 before the Society the results of my examination, and to append 

 revised descriptions of two species from the Argentine Republic. 



1. GoNGYLUS melanogastricus, Burmcister, Verz. Zool. Mus. 

 Halle, 1850, p. 79 (jiom. nud.), =Chalcides viridanus, Graveuh. The 

 specimens are therefore not from Brazil, as stated by Burmeister. 



I may add, from the examination of fresh specimens of this 

 Lizard recently brought to me by Mr. E. B. Poulton, who collected 

 them in Grand Canary Island, that the colour of the lower surface 

 is a bright yellow, which turns to black after some time in spirit. 



2. Platydactylus albomaculatus, Giebel, Zeitschr. ges. Na- 

 turw. xvii. 1861, p. o9, from Banka, =Gecko stentor, Cantor. 



3. Platydactylus burmeisteri, id. ibid., from the same loca- 

 lity, = G. monarchus, Schleg. 



4. Platydactylus deissneri, id. ibid. p. 60, from the same 

 locality, = G. monarchus, Schleg. 



References to these three synonyms have been omitted from the 

 British Museum Catalogue of Lizards. 



5. Gymnodactylus horridus. (Plate XV. fig. 1.) 

 Gymnodactylus horridus, Burmeister, Reise La Plata, ii. p. 522. 

 Head once and a half as long as broad ; snout a little longer than 



the diameter of the orbit, as long as the distance between the eye 

 and the ear-opening ; forehead plane ; ear-opening oval, oblique, 

 half the diameter of the eye. The adpressed hind limb reaches the 

 shoulder. Digits slightly depressed at the base, with well-developed 



