18 Messrs. Parker, Jones, and T ady on the 



Una, PI. I. figs. 1, 2; Miliola, figs. 3-15; Fabularia, fig. 16; 

 Pcneroplis, figs. 17-20; Orbiculina, figs. 21, 22; Alveolina, 

 fig. 23); Lituolida (Valvulina, figs. 24-26); Lagenida {No- 

 dosarina, figs. 27-46; Polymorphina, PI. II. figs. 47-53; Uvi- 

 gerina, fig. 54); Globigerinida (Globigerina, figs. 55, 56; 

 Pullenia, fig. 57 ; Spharoidina, fig. 58 ; Textularia, figs. 59- 

 63; Bulimina, figs. 64-66; Cassidulina, fig. 67; Discorbina, 

 figs. 68-71 ; Planorbulina, figs. 73-77, and PI. III. figs. 78, 79 ; 

 Puhinulina, PI. III. figs. 80-82 ; Ztota&a, figs. 83-86 ; C«/ca- 

 rm#, figs. 87-90); Nummulinida {Amphistegina, figs. 91, 92; 

 Operculina, figs. 93, 94 ; Nummulina, fig. 95 ; Polystomella, 

 fig. 96; Nonionina, figs. 97-99; Heterostegina, fig. 100). 



LlVRAISON l rc . 



Model no. 1. Nodosaria Radicula*, Linn. sp. Annales des 

 Sciences-]-, vol. vii. 1826, p. 252, no. 3. 



Hab. Adriatic. PI. I. fig. 27. 



The common straight Nodosarian form, with few globose 

 chambers, smooth and free from any surface-markings. 



Model no. 2. Nodosaria (Orthocerina) Clavulus*, Lamk. sp. 

 Page 255. no. 48. 



Hab. Fossil near Paris. PI. I. fig. 25. 



A Clavuline variety of Valvulina triangularis. The term 

 Orthocerina was applied by D'Orbigny in 1839 (Foram. Cuba, 

 p. 18 of 8vo edition, p. 47 of 4to ed.) to a Foraminifer really 

 related to Nodosaria, namely, 0. quadrilatera (For. Cuba, pi. 1. 

 figs. 11, 12). An Orthocerina which was described and figured 

 by Reuss as Triplasia (and afterwards Rhabdogonium) Murchisoni 

 is perhaps the best type of this somewhat peculiar genus. Al- 

 though Orthocerina is evidently one of the Lagenida, allied to 

 both Nodosaria and Uvigerina, it must be allowed to stand 

 apart. (See Carpenter's Introd. Foram. p. 166.) 



Prof. Heuss, in describing the three-sided Orthocerina above 

 alluded to, from fossil specimens found in the Cretaceous rocks 

 of the Eastern Alps, made use of the generic term Triplasia for 

 it (Sitzungsber. Akad. Wiss. Wien, vii. 1854), and subsequently 

 substituted Rhabdogonium as a denomination for these three- or 

 four-sided Orthocerina {ibid. 1860). D'Orbigny's subgeneric 

 term is misapplied to the Model under consideration, yet it was 

 evidently used in 1839 on the plan that he originally intended; 



* The species and varieties marked by an asterisk have been already 

 noticed by ns in former papers. 



t The references throughout arc to D'Orbigny's paper in the 'Annales 

 des Sciences Naturelles,' ser. 1. vol. vii. 1826. 



