5. UTDRASPIS. 223 



2. Hydraspis tuberosa. 



Ilydraspis dopressa (non Men-.), Orai/, Cat. SIi. licpf. i. p. o7 (IBoo). 

 I'latoniys liilaiii (^n(j)i 1). ^- li.), Trovch. in Sc/ii>)itln(rfjL-, Iteus. Brit. 

 Guiana, iii. p. G47 (1848). 



deprej^sa, juv., St ranch, Chelon. St ml. p. lo8 (18(52). 



tuberosa, Peters, Mon. JJerl. Ac. 1870, ]>. :',\ \, pi. — . 



Hydraspis tuberosa, Gray, Siipjil. Cat. Sh. llept. i. p. 75 (1870). 



Carapace with a vertebral keel, and a lateral keel or series of 

 knobs along the costals. Front lobe of plastron broader than hind 

 lobe; intergular shield usually as long as its distance from the 

 abdominals ; suture between the pectorals usually shorter than tliat 

 between the abdominals. Median region of u])pcr surface of head 

 divided into irregular shields ; parietal bones above wider than the 

 diameter of the orbit ; mental barbels a little shorter than the 

 diameter of the c^'e. Brownish above, edge of carapace yellow ; 

 plastron and lower surface of marginals yellow, with symmetrical 

 black spots and vermiculatious ; the black spots under the anterior 

 half of the margin confluent into a band ; a black streak on each 

 side of the head and neck, passing through the eye, often uniting 

 with anutlicr behind the tympanum ; a crescentic black streak on 

 the chin, embracing the base of the barbels ; throat yellow, with 

 black spots and marblings ; inner side and borders of limbs yellow. 



Tlie shell of the specimen described by Peters measures 127 

 millira. 



British Guiana. 



a. Yg., spir. British Guiana. Sir R. Schomburgk [P.]. 



b. Yg., spir. ? Dr. Iliippell [P.]. 



c. Yg.,spir. ? 



3. Hydraspis geoffroyana. 



Emys geoffroana, Sc/nvei(/r/. Prodr. p. 33 (1814). 



depressa, Men: Tent. p. 22 (1820); Wied, Beitr. i. p. 29 



(1825), a7id Ahhild. pi. — (1831). 

 ? Emys viridis, Spix, Test. Bras. p. 3, pi. ii. fig. 4 & pi. iii. fig. 1 



(1824). 

 Chelodina geoffroana, Fitz. N. CI. It. p. 4o (1826). 

 Hydraspis depressa. Gray, Syn. Bept. p. 41 (1831). 

 Y ilydraspis viridis. Gray, I. c. 

 Platemys geotireana, Dum. ^ Bibr. ii. p. 418 (1835) ; Strauch. Clielon. 



Stud. -p. 152 (1802). 



neuwiedii, Dum. 8f Bibr. p. 425. 



Phrynops geof?royaua, Gray, Cat. Tort. p. 41 (1844). 

 Hydraspis geoffroyana, Gray, Cat. Sh. Bept. i. p. 57 (1855). 

 Platemys depressa, Strattch, I. c. p. 153. 

 geoffreyana, part., Hensel, Arch. f. Kat. 18G8, p. 350. 



Carapace with a very feeble vertebral keel, which disappears in 

 the adult. Front lobe of plastron slightly broader than hind lobe ; 

 intergular shield shorter than its distance from the abdominals; 

 suture between the pectorals as long as or shorter than that between 



