34 Messrs. Parker, Jones, and Brady on the 



Model no. 94. Triloculina tricarinata, D'Orb. Page 299, no. 7. 



Hab. Red Sea. PL I. fig. 8. 



This form is closely allied to T. trigonula, of which it may 

 be considered a variety. The outer margins of the chambers, 

 instead of being rounded, as in T. trigonula, are produced, and 

 form a sharp keel-like armature to the three angles of the shell. 



Model no. 95. Triloculina oblonga*, Montagu. Page 300, no. 16. 



Hab. Adriatic ; Mediterranean ; Atlantic, on the French and 

 English coasts; the Antilles; fossil near Bordeaux, Soissons, 

 Dax, and Castel-Arquato. PI. I. fig. 9. 



The elongated, compressed form of the same subtype, passing 

 in many instances into weak forms of Quinqueloculina Seminu- 

 lum, Linn., sp. 



Model no. 96. Quinqueloculina secans, D'Orb. Page 303, no. 43. 



Hab. Adriatic and Mediterranean. PI. I. fig. 10. 



This is the large outspread form of Quinqueloculina Seminu- 

 lum, Linn., sp., common in all our littoral sands, and having 

 sharp edges and obscure irregular transverse markings, never 

 amounting to costse. 



Model no. 97. Adelosina striata, D'Orb. Page 304, no. 2. 



Hab. Possil at Castel-Arquato. PI. I. fig. 15. 



The immature form of Quinqueloculina Brongniartii, D'Orb. 

 See note to Model no. 18, which represents the still younger 

 condition of the shell. 



Model no. 98. Amphistegina Lessoni *, D'Orb. Page 304, no. 3, 

 pi. 17. figs. 1-4. 



Hab. Isle of France. PI. III. fig. 92. 



A thick variety of Amphistegina vulgaris, D'Orb. See Model 

 no. 40. 



Model no. 99. Heterostegina depressa, D'Orb. f Page 305, no. 2, 

 pi. 17. figs. 5-7. 



Hab. Island of St. Helena. PI. III. fig. 100. 



A high-class Foraminifer of the Nummuline group, but having 

 its proper chambers subdivided by secondary septula into nu- 

 merous chamberlets. See Carpenter's 'Introd. Foram.' p. 288, 

 pi. 19. fig. 1. Heterostegina is plentiful in some parts of the 

 tropical and subtropical seas, and occurs fossil in the Middle 

 Tertiary Limestones of Malta, Vienna, and the West Indies, 

 and in Arabia. 



. t Inadvertently omitted to be noticed in our former paper on D'Orbigny's 

 species, Ann. Nat. Hist. ser. 3. vol. xii. p. 439. 



