z 



Till': ItATUACIlIA OF NOK'TII AMEKICA. 



NcKictic Jocdliliin. 



Ciiliili'iiiii' No. of 



llllMlllll. s|l(Mt 



Loi'iililv. 





Wli.n 

 collcc'tud. 



I'lDiii wImhii ircciviil. 



1 KniwiiHviilo, Ti'X I ' C'lipt. Stcwiii I V:iii Vliit 



1 MiMilli of Uiotiiiliiilr ... I. II. riaik 



,:) 1 llcldtcs, 'I't^x ! (i. \V. SIimihhU , 



381 



Naliiiv of 

 spi'iiiiii'ii. 



,,. 



Neolropiral loraVtliex. 



1 MiiadiH, Vera ('riii!. ., 

 \i Ol i/.al(il, K:ist M(^xi('0 , 



I 1)1-. C. Karloriiis ... 



V. Suiiiiclii-.iMt 



1 j (iiiail.iliixiini, WcHi Mcx j T. T. Majiii- 



1 ' Cciliina, WrsI, Mo.siro .. . i , iloliii Xanlii>< 



1 OiiK.a, lliiiiiliiiaH ' Dr. .r. L. I.cC.iMto 



5 1 Vni'.ifaii I Arlliiii Srliolt 



AMl'lUGNATIIODONTID.E. 



15oulcii<,'or, Cat. liiitr. Sal. Hiit. Mas., cd. ii, H-".', !>. IU». 



IJiit two {(eiieiii of this fuiiiily arc known, as follows : 



I)inits with l:ii'jj;c (liliitatioiis oil lliu extremities ; a dorsal deriiial pouch; 



Amphujiiathodon Boul. 

 l)i;;itM aeiito at eiiil ; no dorsal i)oiieli (Iryiilnciin' Cope, 



Tlie typical gemis is liyla'lorm, while Grypisciis is a robust terrestrial 

 type. The true position of the latter being soinowhat doubtful, I give 

 the following more exact definition : 



Mandible with a series of caducous pleurodont teeth, aiul a permanent 

 elevated tooth on each side the symi)hysis. Prefrontal bones fully de- 

 v(;loped,in contact with each other throughout, and with frontoparietals. 

 Auditory apjiaratus well developed; tongue broad, entire, little free. 

 \()meriiie teeth ; no parotoid glands. (See I'lato (>8, lig. 11.) 



The mandibular teeth are obtuse, and scarcely project above the al- 

 veolar margin ; their attachment appears to bo to the mucous membrane 

 only, on which account they are readily scraped away. 



The alllnities of this genus are as yet obscure; the mandibular teetU 

 and general form would refer it to the ncmii)hractidie, but the form of 

 the sacrum separates it. The form of the cranium, with its broad out- 

 line and narrow brain-case, and of the body in general, are nearest to 

 Cyclorhamphus and Cophieus, though the form of the sacrum soi)arates 

 it again. If referred to the Pelodytidir, it will be the type of a group 

 ill the family characterized as follows: 



Frontopiirietal bones fully developed; xiphisteruum an emarginatc, 

 cartilaginou.s shield: coccygeal style attached to two condyles; toes 

 webbed. 



*A lii^iiro of (I'n/yji.scd.s iiiiiliriinis will ho Ibiind in the Addenda. 



.1! 





