X 



i'llli IJAl'UALMllA OF NOKTll AMEUICA, 



12r) 



Or tliiis: 



Two rU10.MA.\Il.LAKII':S. 



(lijriHoiihiluH, 

 I'ltlhiidoii. 

 dvotritoii, 

 IhmidavhjUum. 



Dif^itH 4-5, 

 a. Distinct. 

 Toiifjiiu IVnc. 



Toni^iio iutiiclicd. 



iX(X. United. 



Dibits 4-4. 



ONK PltlCMAXIl.LAKY. 



Sjtvliriwu. 



SUnvchiliin. 



(Kiiipun. 



(titculitn. 

 Ilalravhoscjin, 



Some other chanicters found in tlii.s tiu lily are those of low develop- 

 ment nnd iiijproxiiniitions to the larvul condition. Thu.s three of the .spe- 

 eie.s exhibit at tinie.s a subnareal cirrhn.s, which occurs in some of the 

 Co'cilid! ', and Xenopus among Salientia. It is the persistence of that 

 long sulDcular tentacle characteristic of the early larval stage of Uro- 

 dehi generally (see Plate 10), and of a later larval stage of Xenopus 

 (cid. Wyman and (Jray), where they resemble the appendages of the 

 Siluridie. They have been called crochets by Itusconi, and homologized 

 with the cylimlric cephalic processes of the larval liana, with what cor- 

 rectness remains to be proven by ob.servations on other types. 



I'ischscholtz correctly rei>resents 7><(/ra(7/f>.st7).s' attcnuatiis i\>i without 

 pretbntals. An elongate process of the frontal occupies only part of its 

 place, forming no suture w ith the maxillary. This is (juite ditUirent from 

 J)enK)gnathus, where the orbit is comi»leted by the union of frontal and 

 maxillary. In ^fan(^nlus ijiiadi'idi(iit(itun the prefrontal occuipics this 

 depression as an elongate vertical .scale. 



In fSpclerpcs ruber the (luadratum presents a small internal anterior 

 ala, whi(;h has a superlicial resemblance to a pterygoid. In this species 

 there is ai)parently an a/.ygus bone behind the luemaxillaries. This is, 

 however, only the expo.sed extremity of their united spines, w hich are 

 nearly or (piite i.solated by the approximation of thi^ anterior parts of 

 the nasale. It does not occur in the Gyriuophilti.s porphyritkuti. 



JJATUACIIOSEPS Donap. 



Faiuia Italica; Oniy, Cat. Hrit. Mun., \H20, 4vJ ; Coiic, Piococil. Ac I'liila., 

 1809, p. 1)8 ; Straucli, Salani., i>. 84; Houlen^cr, pt. Cat. Brit. Mns., 

 Oil. n, lS8i, J). .V.>. 



Tongue adherent anteriorly. Digits I, 4 ; a large parietal fontanelle. 

 i'remaxillary single, pierced by a fontanelle. 



This genus embraces the tbrms which may be considered the lowest 

 in the family. It dill'ers from Ilemidactyliuni as Thorius does from 

 Si>elerpes, /. r., in the nonossitlcation of the parietal bones. This low 

 grade of development is liero «een in the extremities also, whi(;h are 



f > 



ft. i^m 



