DENTALINA OBLIQUA. 221 



To do away with the term " Dentalina " would be very inconvenient, and, 

 indeed, an unnecessary sacrifice to an attempted exactness in terminology; for its 

 use is certainly convenient in the frequent mention and defining of the arcuate 

 and tapering Nodosarians to which it has been so long applied, whether by itself, 

 or inserted in brackets after " NodosariaJ' 



1. Dentalina obliqua (Lmne), 1767. Plate I, fig. 9 ; Plate V, fig. 6. 



Part I, 1866, p. 54 ; and Append. I and II, Tables, No. 42. 

 Additional Synonyms : 



Orthoceras, Martini, 1769. N.'Syst. Conch. -Cab., vol. i, pp. i and 39, Vignettes, 



S,k. 



Orthocerata conico-cylindroidea, recurva, striata, &c., Soldani, 1780. Saggio Oritto- 



graphia, p. 107, pi. v, figs. 37 p P ; 

 Hortoceratia, &c., Testaceogr., vol. ii, 

 Appendix, 1798, p. 14^1, pi. v, figs. 

 37 p P [an arcuate, taperiug form of 

 JV. rapJianus], 



Orthoceratia in longum striata, subconica, &c., Soldani, 1791. Testaceogr., vol. i, 



part 2, p. 91, pi. xciv, fig. S ( = Nodo- 

 saria \_Dentalina\ suhstriata, d'Orb. 

 Ann. Sci. Nat., vol. vii, 1826, p. 255, 

 No. 46; Ann. Mag. N. H., ser. 4, 

 vol. viii, 1871, p. 160, No. 27, pi. ix, 

 fig. 54.) A tapering form, with short 

 chambers, imperfectly costate. 

 — Baculi, I, K, L, ostendunt aliquas Raphani vel RapJianistri varietates, 



Soldani, 1791. Ibid., p. 97, pi. ciii. 



[Fig. I {^Nodosaria [Dentalinal Cuvieri, 



d'Orb., vol. vii, 1826, p. 255, No. 45 ; 



. . Ann. Mag. N. Hist., ser. 4, vol. viii, 



1871, p. 160, No. 26, pi. ix, fig. 57.] 

 Curved, conico-cylindroid, tapering ; 

 except near the top the septa are not 

 excavate. In fig. k the lower half is 

 D. obliqua, but the upper part takes on 

 smooth and short chambers, like those 

 in N. ambigua. In fig. l the lower 

 part is D. obliqua, but the upper and 

 larger moiety has only short, scattered, 

 irregular riblets. 



