968 17. KINOSTERNIDM 



Cinosternum sotioriense Cope, Bull. U. S. Nat. Mus., No. i, 1875, p. 52; 

 CouES, Surv. W. looth Merid., Vol. V, 1875, p. 589; True, Bull. 

 U. S. Nat. Mus., No. 24, 188.^, p. 31; Boulenger, Cat. Chelonians 

 Brit. Mus., 1889, p. 40; SiEBENRocK, SB. .'\kad. Wiss. VVicn, Vol. 

 116, 1907, p. 571; Siebenrock, Zool. Jalirb., Suppl. 10, Heft j, 

 1909, p. 444. 



Cinosternum flavescens Cope, Bull. U. S. Nat. Mus., No. I, 1875, p. 52 

 (part); True, Bull. U. S. Nat. Mus., No. 24, 1883, p. 31 (part). 



Aromochelys carinatus Yarrow, Surv. W. looth Merid., Vol. V, 1875, 

 p. 582. 



Kinosternon sonoriense Stejneger, Proc. U. S. Nat. Mus., Vol. 2;, 1902, 

 p. 149; RuTHVEN, Bull. Amer. Mus. Nat. Hist., Vol. 23, 1907, 

 P- 594; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4, 

 Vol. 3, 1913, p. 396; Grinnell & Camp, Univ. Cal. Publ. Zool., 

 Vol. 17, No. 10, 1917, p. 200; Stejneger & Barbour, Check List 

 N. Amer. Amph. Rept., 1917, p. 112. 



Description. — Shell rather narrow, elongate, somewhat 

 depressed, smooth. Vertebrals five, usually longer than 

 broad. Costals four, first longest, second and third highest, 

 last smallest. Nuchal narrow. Marginals 1 1 on each side, 

 ninth with superior border not much elevated anteriorly, 

 supracaudals not united. Plastron large, extending forward 

 about as far as carapace, its central region covered by the 

 abdominal plates, united to carapace by a strong bridge. 

 Anterior and posterior portions of plastron hinged, capable 

 of closing shell completely when head and limbs are re- 

 drawn. Gulars partly or completely united into a single 

 plate. Pectoral median suture shortest. Abdominal suture 

 longest. Anal suture next longest. Axillary and inguinal 

 plates elongate, separating abdominal from marginals. Head 

 rather large, somewhat pointed, covered with smooth skin. 

 Chin and throat with a few barbules. Limbs covered with 

 smooth skin except close to toesj anterior with five, posterior 

 with four toes, completely webbed. Tail of moderate length, 

 ending in a horny nail or claw. 



