ON THE FAI'XA ANI> J-'LORA OF THE TRIAS OF THE BRITISH ISLES. 809 



2. R. OwBN.— ' Note on the Affinities of Rhynchosaums' ' Ann. Mag. Nat, Hist. 

 [3] vol. iv. (ISr.O). pp. 2:^7-238. 



:i. R. Owen. — ' Notice of a Skull and parts of the Skeleton of TfJiyvrJinxavruii 

 ,irtiei^>.<<; 'Vhil. Tran.s.' 1862, pp. 46(1, 167, pi. s.kv. 



1. T. H. lIixi.EY. — • Further Observations upon Ifyjuviulapedon gordoni,' ■ Quart. 

 Journ. Cieol. Soc.' vol. xliii. (1887), pp. G89 (i!t2, pi. xxvii. 



"i. R. 15i:uCKiiARl5T. — 'On Ihijhriidnpcdon i/nrdnnl,' 'Oeol. Mnp.' [4] vol. vii 

 (I'.tOO), pji. 4.'^(;^4ri2, .52'.1-5:14, text-lig. 8 



(). A- S. WoODWAun. — ' Notes on Footprints from the Kouper of South St.'ifll'onl- 

 sihhc' • Oeol. M:ig.' [4] vol. ix. (1902), pp. 2ir)_217, text-tigs. 1,2. 



Explanatio7i of I'lafe II, 



nhynehoiaiiriisi artirep.^, Owen; Keuper Sandstone, Grinsill, Shropshire. All 

 figs. nat. size. 



Fig. 1. Palatal view of skull (B.M. No. R. 1230) : yjt, interptorygoid vacuitj-; 

 Olid., mandible ; j/L, palatine ; jmix , premaxilla ; pt., pterygoid. 



Fig. 2. Left fore limb, anterior aspect, with traces of integument (S. No. 0) ; 

 //., humerus; r, radius; ?<, ulna ; I. -V., digits. 



Fig. 3. Itight humerus, dorsal aspect (B.M. No. R. 1239). 



Fig. 4. Anterior abdomin.al ribs (B.M. No. H. 1238). 



Fig. 5. Posterior abdominal ribs (S. No. 5). 



Meport on Footprints from tlie Tria-i. Part IV. By H. C. Be.\slj;y. 



Since the last Report ( 1 90;")) some fm tliPr forms have been examined, 

 and may be now described. 



Cheirotlteroid Form. — A 4. Pes : resemble.s that of A 1 (lleport 

 1903), but somewh.it more .slender and of smaller size, being only 

 7 inclios in length. The nails well shown and sharply 

 pointed. The sole covered with flattened tubercles 

 1 to 2 mm. in diameter. 



Manus : Length, 4 cm. ; breadth, 4-5 cm. Four 

 digits shown : III. the longest, 25 cm. ; IT. slightly 

 shorter, each tapering very rapidly and evenly to a 

 sharp termination, though no trace of a nail has been 

 noticed ; width of each of these digits about 1 cm. at ]\[anus. ' nat size 

 root. The outer digits, presumably I. and IV., are 

 much shorter, about 8 mm. So far no trace of V. lias been seen. The 

 surface of the natural cast is well rounded from before backwards, aiid 

 transversely. 



The distinguishing feature of this form is the small size of the Manus 

 as compared with the Pes — viz., .about one-seventh the length. Also tlie 

 greater paralleli.sm of the digits, giving it a more compact appearance. 



Numerous prints have been seen .amongst tho.se lately raised at 

 Storeton. There is also an example in the Liverpool Museum, ' no 

 locality.' 



A iine series is shown on a large slab (6 feet square) at Storeton, 

 crossing it diagonally. The prints have the same linear arrangement 

 noticed in A 1 (see Report, 190:^). Distance froni one footprint to 

 the next of same foot, 2' 9" agaiiist '?>' 1" in A 1. Manus is shown 

 'l inch in advance f)f extremity of Til. digit of Pes. 



This form may be compared with tlie smaller pi-ints on the P>ritish 

 ISruseum slab R. 729, described and figured as 'L' in Part I. of thi.s; 

 Report (190.S).i 



' Material obtained since this report was in type will necessitate some modilic^^ 

 tlon of the descriptiop of A. 4 in the next Report of thp C'ommi^teg. 



