1890.] ON SOME UPPER CRETACEOUS FISHES. 629 



EXPLANATION OF PLATE LIII. 



Fig. 1. Di^Mhcle wakhi, ]}. 622. 



1 a, Spider in profile, witbout legs ; 1 b, sternum and labium ; 1 c, 

 eyes from above and behind ; 1 d, extremity of falx ; 1 e, tarsus of leg 

 of 1st pair ; 1/, binder part of abdomen, and spinners in profile ; 1 ff, 

 ditto from below ; 1 h, one of the masillce. 



2. Bendricon rastratum, p. (i23. 



2 a, cepbalothorax in profile, without legs ; 2 h, eyes from above and 

 behind; 2 c, spinners from below. 



3. Migas paradoxus, p. 624. Nest. 



4. Platyoides abrahami, p. 625. 



4 a, underside, showing maxillre, labium, and sternum ; 4 b, eyes 

 from above and behind ; 4 c, Spider in profile, without legs ; 4 d, 

 extremity of tarsus of 3rd pair of legs ; 4 e, spinners from below ; 4/, 

 genital aperture; iff, lengths of the four legs. 



5. Bobsonia formidabilis, Y). 625. 



5 a, eyes from above and behind ; 5 b, Spider in profile, without legs ; 

 5 c, right palpus from outer side ; .5 d, lengths of two examples. 



6. Argyrocpeira blanda, p. 627. Abdomen, upperside. 



6 a, ditto in profile. 



7. letmgnatha taylori, p. 627. One of the falces. 



8. Coerostris albiceps, p. 628. 



3. On some Upper Cretaceous Fishes of the Family of 

 AspidorhyncUdce. By A. Smith Woodward, F.Z.S.^ 

 of the British Museum (Natural History). 



[Eeceived November 4, 1890.] 



(Plates LIV. & LV.) 



Amoug the fishes met with in Upper Cretaceous rocks, there are 

 very few representatives of the " ganoid " types so characteristic of 

 earlier Mesozoic formations. Solitary survivors, however, do occur 

 in almost every fish-fauna of late Cretaceous date hitherto discovered ; 

 and conspicuous among these are members of the remarkably speci- 

 alized family of Aspidorhynchidae. It is of much interest to com- 

 pare the latest species of such a family with those by which it was 

 represented at earlier periods ; and a large series of specimens in the 

 British Museum now enables this comparison to be made in a more 

 satisfactory manner than has hitherto been possible, A number of 

 undescribed fossils from tlie Upper Cretaceous of Brazil are referable 

 to the genus Belonostomus, and reveal most of the principal external 

 characters of the species they represent ; while some fine examples 

 of another genus, as yet imperfectly described and inaccurately de- 

 termined, prove the occurrence of an allied, though more specialized, 

 fish in the corresponding formation of Mount Lebanon, Syria. 



Genus Belonostomus. 



[L. Agassiz, Poiss. Foss. vol, ii. pt. ii. 1844, p. 140.] 



Belonostomus comptoni. (Plate LIV,, Plate LV. figs. 1-10.) 



1841. Aspidorhyiichus comptoni, L. Agassiz, Edinb. New Phil. 

 Journ. vol. xxx. p. 83. 



