240 BULLETIN 34, UNITP]D STATES NATIONAL MUSEUM. 



fl lu a gular (tlio vocal) sac ; the young is expelled iu the perfect 

 state. 

 BhinocUrma.'' 

 b. By tlie female, 

 a. Attached to the belly. 



llhacopliorus reticulatus Gthr.t 

 p. Attached to the Lack; the young completes its metamorpliosis withiu 

 the egg. 



■y. Iu a dorsal jiouch. 



aa. The youug leaves the pouch iu the tadpole state. 



Notoirema marsuj)iatuni Dum. & Bibr.^ 

 fc6. The youug leave"" the pouch iu the perfect state. Noiotrema 

 Ustudineum Esp. ;|| Opisthodelphys ovifera Weiul.|| 



The species of Dendrobates liave the peculiar Labit of carrying tbe 

 youug from place to place iu search of water. The tadpoles resemble 

 those of Raua or Bufo, and attach themselves by the mouth to the back 

 of the parent. Whether the eggs are canned iu this position is not 

 knowu.^l 



The larvaj of Salientia have been divided into two groups by Lataste, 

 the Mediogyrini and the Laevogyriui.** In the former the external 

 branchial orifice is on the median line of the inferior surface ; in the 

 other it is on the left side. To the former division belong the Disco- 

 glossidfe ; to the latter all remaining Salientia, except Aglossa, where 

 there are two spiracula, one on each side (Amphigyriui Heron-Royer). 



In the stage which immediately follows the separation from the egg 

 the tadjjoles of Salientia possess one or two peculiar sucking disks on 

 the under side of the head behind the position of the mouth. Their 

 form differs (Plate 78) widely in different genera of Auura, and will 

 afford a valuable means of identifying the larvae. In JDiscoglossus pictus, 

 the adhesive organ behind the mouth, is hemispherical, with a V-shaped 

 groove on its surface, the V opening forward. In Pelodates fuscus the 

 adhesive organ is V-shaped, with a V-shaped groove on its surface, and 

 the limbs of the whole organ extending forward to embrace the angles 

 of the mouth. In Biifo vulgaris the organ is V-shaped, with a V-shaped 

 groove, and the limbs of the V come into contact with the angles of the 

 mouth. In Bufo viridis the organ is crescent-shaped, not in contact with 

 the mouth, but a little behind it, as in Discoglossus, and with a widely 

 open V-shaped groove. In Bombinator, Raua, and Hyla there are two dis- 



* Jimenez de la Espada, Ann. Soc. Esp. Hist. Nat., i, 1872, p. 139 ; Speugel, Zeitschr. 

 wiss. Zool. XXIX, 1877, p. 495; Howes Proceeds. Zool. Soc. Loudou, 1888, p. 231. 



t Giiuther, Aun. & Mag. Nat. Hist. (4), xvir, 1876, p. 379; Ferguson, oj;. cit., xviii, 

 187G, p. 357. 



t Formin, Developpemeut parfait du mystere de la g^u6ratiou du fameux Crajiaud 

 de Surinam ; Maestricht, 1765. 



'^ Boulenger, Cat. Batr. Ecaud., 1882, p. 417. 



II Weinlaud, Arch. f. Auat. Physiol., 1854, p. 449. 



U Kappler, Das Auslaud, 1885, p. 853; Smith, American Naturalist, 1888, p. 182. 



** The family terminations "ida;" given to these divisions by Lataste are inap- 

 propriate, as they do not represent families. 



