5. WYDRASPIS. 923 
2. Hydraspis tuberosa. 
Hydraspis depressa (non Merr.), Gray, Cat. Sh. Rept. i. p.57 (1855). 
Platemys hilarii (non D. § B.), Trosch. in Schomburgk, Reis. Brit. 
Guiana, iii. p. 647 (1848). 
depressa, juv., Strauch, Chelon. Stud. p. 153 (1862). 
tuberosa, Peters, Mon. Berl. Ac. 1870, p. 311, pl. —. 
Hydraspis tuberosa, Gray, Suppl. Cat. Sh. Rept. 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 that 
between the abdominals. Median region of upper 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 eye. Brownish above, edge of carapace yellow ; 
plastron and lower surface of marginals yellow, with symmetrical 
black spots and vermiculations ; 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 another 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. 
The shell of the specimen described by Peters measures 127 
millim. 
British Guiana. 
a, Yg., spir. British Guiana. Sir R. Schomburgk [ P. ]. 
b. Ye., spir. p Dr, Rippell [ P. ]. 
e. Yg., spir. —? 
3. Hydraspis geoffroyana. 
Emys geoffroana, Schweigg. Prodr. p. 33 (1814). 
depressa, Merr. Tent. p. 22 (1820); Wied, Beitr. i. p. 29 
(1825), and Abbild. pl. — (1831). 
? Emys viridis, Spe, Test. Bras, p, 3, pl. ii. fig. 4 & pl. iii. fig, 1 
(1824). 
Chelodina geoffroana, Fitz. N. Cl. R. p. 45 (1826). 
Hydraspis depressa, Gray, Syn. Rept. p. 41 (1831). 
? Hydraspis viridis, Gray, J. ec. 
Platemys geoffreana, Dum. § Bibr. ii. p. 418 (1835) ; Strauch, Chelon. 
Stud. p. 152 (1862). 
neuwiedii, Dum. § Bibr. p. 425. 
Phrynops geoffroyana, Gray, Cat. Tort. p. 41 (1844). 
Hydraspis geoffroyana, Gray, Cat. Sh. Rept. i, p. 57 (1855), 
Platemys depressa, Strauch, l.c. p. 153. 
—— geoffreyana, part., Hensel, Arch. f. Nat. 1868, 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 
