222 CnELTDID^. 



Mental barbels sborter than tlic diameter 

 of tlie ej-c ; intergular shield longer than 

 its distance from the abdominals 5, racUoIata, p. 225. 



II. Skin of median upper surface of head undivided. 



Suture between the pectoral shields longer 



than that between tlie abdominals 6. rvfij^es, p. 225. 



Suture between the pectoral shields shorter 



than that between the abdominals .... 7. u'ctjleri, p. 225. 



1. Hydraspis liilarii. 



rhrynops geofTroyana (non Schtrcvjg.), Waf/l. Syst. Amph. p. 135, 



pi. V. tigs, xlviii.-li. (1830), and Icones, pi. xxvi. (ISo."}}. 

 Plateniys geoffreana, juv., Dinn. ^- liihr. ii. p. 421 (1835). 

 hilarii, Dum. ^- Bihr. p. 428; Gulchen. in Caateln. Voy. Amc7\ 



Slid, liept. p. 7, pi. i. (1855) ; JJiirmcktir, lieisc La Plata, ii. 



p. 521 (1801). 

 Ilvdraspis hilarii, Gray, Cat Tort. p. 40 (1844), and Sh. liept. i. 



p. 57 (1855). 

 Plateniys geotireyana, part., Ilcnsel, Arch.f. Nat. 18G8, p. 350. 

 Spatuleniys lasah\3, Gray, Ayrn. §f May. N. II. (4) x. p. 4(J3 (1872), 



and xi.'p. 73, pi. ii. (1873). 



Carai)ace with a very feeble vertebral keel, which may disappear 

 in the adult: dorsal shields of young not gibbose, but with con- 

 centric and radiating striae. Front lobe of plastron broader than 

 hind lobe ; intergular shield as long as its distance from tlie 

 abdominals in the young, shorter in the adult : suture between the 

 pectorals much shorter than that between the abdominals. Median 

 region of upper surface of head divided into irregular shields, 

 among which a small azygos frontal is constantly distinct ; parietal 

 bones above as wide as the diameter of the orbit ; mental barbels 

 at least as long as the diameter of the eye, club-shaped, narrowest 

 at the base. Olive above, edge of carapace yellow ; some of the 

 marginals usually with one or two small black spots ; plastron and 

 lower surface of marginals yellow, with black spots disposed more 

 or less symmetrically ; a black line on each side of the head and 

 neck, passing through the e^e ; lower surface of head and neck, and 

 tympanum, yellow ; each barbel w ith a black ring ; a black line on 

 each side of the throat, behind the barbels, sometimes connected 

 with the lateral line on the neck ; lower surface of neck with a few 

 black spots ; inner surface of limbs yellow, with one or more black 

 spots or streaks ; hinder side of thighs with a black band. 



Length of shell 34 centim. 



South America between the Amazons and the Parana. 



(i^ j_y. ^ ^ ^ hgr. Rio Grande do Sul. Dr. II. v. Iheriug [C.]. 



& yg., spir. 



y. J,skel. Rio Grande do SuL Dr. IT. v. Iliering [C.]. 



h. S , sttiii. Ii. Parana, I'rov. Col. Perez de Lasala [P.]. 



Corrieutes. (lype of S. lasalce.) 



i. 5 , spir. Buenos Ayres. AV. White, Esq. [C.]. 



k. d, stffd. ? 



