1872.] BLAKE YORKSHIRE INFRALIAS. 145 



add much to the knowledge of the microscopic fauna of the Lias ; 

 the chief features of the fauna, however, may be noticed. 



Noclosaria. — Of this there are smooth varieties, elongated like N. 

 raclicula (L.), and shortened like N. glans (D'Orb.) ; and also striated 

 varieties, thick like N. raphanistrum (L.), and narrow like iV^. lineo- 

 lata (Ess.). 



Dentalina. — This is in great abundance and variety. Of smooth 

 kinds, some are oblique, as D. commtmis (D'Orb.) and B. obliqua 

 (D'Orb.) ; some have the cells perpendicular to the axis, as B. 

 pauperata (D'Orb.), or elongated, as D. monile (Rss.) ; and there are 

 others differing from all the well-known forms. There are also some 

 ribbed varieties, as I), ohliquestriata (Rss.). 



Lingulina.—Some few may be referred to L. tenera (Born.). 

 Frondicularia. — These are the characteristic Foraminifera of the 

 beds, occurring in great abundance, but not in very numerous varie- 

 ties ; they may be referred to F. puhhra (Terq.), and other species of 

 that author. 



Vaginulina is present in its usual form of V. legumen (L.). 

 Planularia.— The identity of these with the forms previously de- 

 scribed by Brady from the Lias of S.W. England is very marked, P. 

 Bronnii (Rom.), F. cornucopice (Brady), and P. pauperata (P. & J.) 

 being common. 



Marginidina. — These are present in the form of M. raphanus (L.), 

 ribbed, and M. lituiis (D'Orb.), smooth, besides many other less- 

 known forms. 



Flabellina rugosa (D'Orb.) is certainly present, though rare. 

 Cristellaria. — These are abundant and present nothing novel, all 

 being referable to C. crepidula (F. & M.), 0. cassis (F. & M.), O. 

 rotidata (Lam.), and other well-known varieties. 



Lagena. — These are among the most interesting of the collection. 

 There are two distinct sets of varieties— one elongated and narrow, 

 like those called " Oolina" by foreign authors, and the other small 

 and globular, variously ornamented, as L. sulcata (W. & J.). 



Polymorphina. — These are in great variety, and cannot be named 

 ■with accuracy. Some compare well with P. lactea (W. & J.) and 

 P. gutta (D'Orb.), and many with P. hilocularis (Terq.) and others 

 of that author. Some may eventually turn out to be Bulimince. 



Textilaria. — Two well-marked specimens are all that have been 

 found of these ; they differ from all well-known forms. 



Triloculina. — One doubtful specimen appears to represent this 

 genus. 



Cornuspira. — ISTumerous specimens of this, mostly casts, can 

 scarcely be distinguished from C. infima (Strickl.). 



Webbina. — Some specimens of this, with irregular chambers, occur 

 attached to fragments of shells. They may probably b-e identified 

 with W. irregularis (D'Orb.). 



Lituola. — There are several specimens in casts, which have the 

 appearance of Eotalines, but are supposed to belong to anomalous 

 forms of this genus. The absence of the original shell renders the 

 decision perhaps impossible. 



