Mr. T. Atthey 07i Rhizodopsis awr? llhizodus. 129 



Uraniidae. 



Urania, Fabricius. 



68. Urania leilus. 

 Papilio leilus, Linnaeus, Syst. Nat. ii. 1, p. 750 (1766). 

 Rio Mairo ; Pozzuzo. 



Nyctalemon, Dalraan. 



69. Nyctalemon empedocles. 



Papilio empedocles, Cramer, Pap. Exot. iii. pi. cxcix. A, B (1782). 



Cajaria, Ucayali. 



Tliis species is readily distinguished from N. lunus by the 

 pale central band being intersected by a brown stripe. 



'XNlll.— Notes on a Paper hij R. H. Traquair, M.D., F.G.S., 

 F.R.S., on the Structure of the Lower Jaw in Rhizodopsis 

 and Rhizodus, in the ' Annals and Magazine of Natural 

 History j'' vol. xix. 4th ser. p. 299. By Thomas Atthey. 



In the first volume of the fourth series of this magazine were 

 published " Notes " on Rhizodopsis, by my late friend Mr. 

 Albany Hancock and myself, in which the pr^maxilla is 

 described as a long, narrow, wedge-shaped bone, with a row 

 of small teeth along the margin, and two laniaries — one large, 

 the other small, the latter placed in front of the former and 

 near to the symphysis. 



Since then a large number of specimens of the cranium of 

 Rhizodopsis, several showing the pr^emaxilla in situ, have 

 been obtained from the black shale at Newsham. 



From three of the largest of these the matrix has been 

 carefully and entirely cleared away, so that all the bones can 

 be well seen. In these specimens the maxilla and our prse- 

 maxilla evidently form the margin of the upper jaw, along 

 which is placed a row of small teeth, with two laniaries, one 

 smaller than the other and lying near to the symphysis, quite 

 as in our description. 



The outline and the outer surface of the mandible are also 

 well defined, with the row of small teeth along its alveolar 

 border interlocking with or being overlain by those of the 

 maxilla and prtem axilla. 



On upwards of half a dozen mandibles in my collection 

 Ann. & Mag. N. Hist. Ser. 4. Vol. xx. 9 



