T.KPTDOSTERNON. 463 



2. Lepidosternon phocaeiia. 



Lepidostcrnon phocfena, (h-ay, Cat. Tort. p. 73, 

 and S/i. llepf. ii. p. 40. 

 Lepidosternon phocaena, Dinn. i^- Bihr. v. p. .507 ; D^Orb. Voi/. Am6r. 

 Mer., Bept. p. 9, pi. vi. figs. 7-11; Strauch, Mel. Biol. Ac. St. 

 reterxh. xi. p. 427. 



Differs from L. microciphalnm chiefly in the following points : — 

 Frontal much longer than broad, as long as its distance from the 

 end of the snout ; supraoculars large, broader than long ; occipitals 

 large, nearly as large as the pavietals. Sternal plates all small, 

 lozenge-shaped, forming oblique series, without any longitudinally 

 dilated ones. 



Argentine Republic. 



a. Ad., stuffed. (Annuli 217+13.) S. America. Mr. Bridges [C.]. 



3. Lepidosternon straiichii. 



Lepidosternum strauclii, Boettq. Zeitschr. f. Nuftinv. Iviii. 1885, 

 p. 221. 



Allied to the preceding. Supraoculars united with the praefron- 

 tals. Two hundred and sixty-five annuli on the body and eighteen 

 on the tail ; an aunulus contains twenty-six dorsal and twenty-four 

 ventral segments. 



Paraguay. 



4. Lepidosternon infraorbitale. 



Lepidosternon infraorbitale, Berth. Gott. Nachr. 1859, p. 179 ; 

 Strauch, Mel. Biol. Ac. St. Petersb. xi. p. 429. 



Snout very thick, little depressed, not very prominent, with the 

 longitudinal grooves feebly marked ; rostral rather small, widely 

 separated from the ocular; a pair of irregular, snboval prtefroutals, 

 placed very obliquely and forming together a very short suture ; a 

 regularly hexagonal frontal, a little longer than broad ; a pair of 

 very irregular parietals, each about half as large as the frontal ; 

 occipitals considerably smaller than the parietals ; eye rather distinct 

 through the ocular, which is a little larger than the supraocular, and 

 forms a suture with a subocular and a very small portion of the 

 second labial ; subocular tra]iezoid, wedged in between the second 

 and third labials ; temporal shields very small ; three up])er labials, 

 first and third very small, second very large ; mental small, broad, 

 quadi-angular, followed by a large median chin-shield, on each 

 side of which is an elongate, narrow, lateral one ; three luwcr 

 labials, first large, second and third very small. Two hundred and 

 sixty-four annuli on the body and seventeen on the tail ; on the 

 body an annulus contains fifty-four segments, twenty-eight dorsal 

 and twenty-six ventral. Peel oral sliields numerous, small, irregular, 

 mostly roundish, forming oblique series. No enlarged anal shields. 



