ADDITIONS AND CORRECTIONS. 77 



of which he thinks E. Geoffroyana is a synonima. 5. Po- 

 DOCNEMUS, H. expansa, H. DumeriUana. 6. Hydromedusa, 

 H, Maximiliana, which he describes " caput elongatum de- 

 pressissimura, cute impresso-vibicosa tectum, ore ranino, 

 mentum inerme, disci scuta 14, maiginis 24/' America. 



Page 40, n. 4. Hydrastis plcmiceps. — This species is 

 named Emys Schnepjii, Wiegmann, in the BerUn Cabinet. 



Page 42, n. 9, add — Hydraspis lata, {Demerara Hydraspis.) 

 " Testa suborbicularis depressa nigra capite colloque nigris 

 aurantio maculatis." 



" Hydraspis lata, Bell Mss." Gray, Griffith, Trans. 

 Cuv. Anim. King. Syn. 17. 



This species is taken from a note of Mr. Bell's, made from 

 two living specimens in the gardens of the Zoological Society ; 

 since that time I have observed, in the museum of that society, 

 a specimen which is probably one of those described, as it 

 answers the above short description ; it only differs from the 

 Emys erythrocepkala, Spix, in being black and more orbicular ; 

 but the latter character may depend on an accidental circum- 

 stance, as the sternum is evidently deformed. Spix does not 

 describe the neck as red spotted, but the specimen shews 

 little of the spots in the preserved state, as it is figured by 

 him; it has the peculiar character of the grooved nose very 

 distinctly marked ; perhaps Emys erythrocepkala may prove 

 distinct from H. expansa, as from this specimen it appears 

 to be a much smaller species, and EmysTracaxa, Spix, may 

 probably prove a variety of E. DumeriUana. 



Page 42. — Humbolt, in his Personal Narrative, (English 

 edition,) iv. 482, has described two tortoises which appear 

 to belong to this genus : thus, 



" Testudo arraii. Testa ovali subconvexa ex griseo nigres- 

 centi subtuslutea ; scutellis disci 5, lateralibus 8, marginalibus 

 24, omnibus planis (nee mucronato conicis) pedibus luteis 

 mento et guttere subtus biappendiculatis." He adds, there 

 is " a deep furrow between the eyes, and the full grown animal 

 weighs from 40 to 50 pounds." 



" Testudo Terekay. Testa ovali atro irridi ; scutellis disci 

 3, lateralibus 10, marginalibus 24 ; capite vertice maculis 

 duabus ex rubro fluvescentibus notate ; subture lutescenti 

 appendiculo spinoso. Diameter about 14 inches. 



Humboldt remarked, that from the form of the head and 

 the appendages of the chin and throat, and the position of 

 the vent, seem to indicate that these species belong to a 

 new subdivision of Tortoises, as has since been done by Mr. 



