76 ADDITIONS AND CORRECTIONS. 



Terrapene triporcata, Wiegmann, Iris 1828, xxi. 364. 

 Bull. Sci. Nat. xix. 293. 



Staurotypus. (Genus) Wagler Araph. 

 Hab. in America Meridionali, Mexico, Rio Alvarado. 

 Wiegmann, v. t. Mus. Bed. 



At page 34. I was induced, from Dr. Wiegmann's refering 

 to Shaw's Zool. t. 15, to refer this species to Kinosternon 

 scorpo'ides which that figure well represents, remarking that 

 the description of the sternum did not agree with that species; 

 having since had the opportunity of examining the original 

 specimen described by Dr. Wiegmann, it proves perfectly 

 distinct from Shaw's. It is the largest species of the genus, 

 being 12 inches long and 7y inches wide, and the dorsal keels 

 are very close together, and very high, especially the hinder 

 part of the central one ; the side ones are highest in front. 

 The vertebral plates are long and imbricate ; the nuchal 

 plate is broad and short, and the sternum is very narrow, 

 covered with very thin indistinct plates, which I could not 

 distinctly count as the animal is fixed upon a board. Dr. 

 Wiegmann describes them as 12, but Dr. Wagler, who has 

 formed a genus named Staurotypus for this species, de- 

 scribes them as 7 or 8 ! they are probably 1 1 . The axillary 

 and the inguinal plates appeared long and broad, so as to 

 cover the greatest part of the cruciform symphysis ; the front 

 of the sternum only is mobile. The sides of the shell are 

 indented, and the hinder margin is much expanded and sub- 

 dentate. The head depressed, lined, and spotted with white ; 

 chin with two beards, and the neck very thick. 



This species agrees with Kinosternon odoratum in the 

 narrowness of the sternum, and appears to form the passage 

 between Kinosternon and Chelydra. 



Dr. Wagler has noticed a species of this genus under the 

 name Cinosternon hirtipes, but I do not find it described. 



Page 38. Sternotherus. — Dr. Wagler has changed the 

 name of this genus to Pelusios, having kept Mr. Bell's generic 

 name for a species of Cistnda. 



Page 38. Chelodina. — Dr. Wagler proposes, (page 136, 

 note) to keep the name Hydraspis for this genus. 



Page 39. Hydraspis. — Dr. Wagler has divided this genus 

 from the number of the marginal plates, and the shape and 

 structure of the skin of the head, into 6 genera : Viz. 1. 

 Pklomedusa for H. subrufa. 2. Platemys for H. pla- 

 niceps. 3. Rhinemys for H. depressa, H. radiolata, H. 

 rnfipes, and H. Caycnnensis (5. 4. Phrynops for H. viridis 



