468 AMPHISBANIDE. 
long as second, on the side of which there is a larger suboval 
lateral chin-shield. Two hundred and forty-four to two hundred 
and fifty-five annuli on the body, and eleven to thirteen on the 
tail; an annulus contains twenty-eight dorsal and twenty-four 
ventral segments. Pectoral shields numerous, small, the medians 
but little larger than the laterals, little longer than broad. Pre- 
anal segments eight. Lateral, vertebral, and ventral lines feebly 
marked. Yellowish, the segments on the posterior third of the 
body greyish in the centre. 
millim. 
Length to vent .............. 330 
RAM ascitic vse) "sig ded ath ava dealers ees 15 
Diameter of body ............ 135 
Paraguay. 
14. Lepidosternon onychocephalum. 
Lepidosternum onychocephalum, Boettg. Zeitschr. f. Naturw. lviii. 
1885, p. 224. 
Rostral rather pointed, its posterior border truncate and forming 
a broad suture with the frontal; latter longer than broad, larger 
than any other head-shield except the rostral; prefrontal and 
supraocular united into a single shield on each side of the frontal ; 
two parietals, the suture they form with the frontal narrower than 
that between the latter and the rostral; a pair of very small occi- 
pitals, broader than long; eye distinct through the relatively large 
pentagonal ocular ; three or four temporals ; two upper labials, first 
scarcely larger than second ; two lower labials, first twice as large 
as second. Two hundred and fifty-five annuli on the body and 
sixteen on the tail; an annulus contains thirty dorsal and twenty- 
four ventral segments. The median pectoral shields considerably 
larger than the others and elongate. Praanal segments six. 
Yellowish, the segments of the posterior part of the body brownish- 
grey in the centre. 
millim. 
Length to vent ............ 260-5 
Pag sek sie Mes ais qotteanetandebaabch as 15:5 
Diameter of body .. ....... 9 
Paraguay. 
15. Lepidosternon octostegun. 
Lepidosternon octostegum, A. Dum. Cat. Méth. Rept. p. 150; Peters, 
on. Berl. Ac. 1879, p. 277, pl. —. fig. 1; Strauch, Mél. Biol. Ac. 
St. Petersh. xi. p. 455, 
Frontal very large, covering the greater part of the head, forming 
a broad suture with the rostral, separating the elongate, narrow, 
prefrontals ; a pair of minute occipitals; eye distinct through the 
rather large ocular, which is as much in contact with the prefrontal 
as with the supraocular ; latter rather large, evidently representing 
