228 Messrs. Parker and Jones on 



topped, gently sculptured^ glassy, flat Pulvinulina, so much 

 coated with clear secondary shell-deposit as to have the fine 

 pores masked. It is near var. puJchella of Pulv. repanda. 

 Ehrenberg has figured it also from the Chalk of Moen (pi. 29. 

 fig. 15). and a very close ally from that of Riigen (pi. 30. fig. 28). 

 Fig. 96, Glohigerina foveoJata (1844, p. 67), is Ol. hidloides. 

 Fig. 97, a, h. Nodosaria? These are single and double rough- 

 coated hollow globules, possibly chambers of Glohigerina (?), 

 but not of Nodosaria. 



Inhabiting a depth of from 40 to 50 fathoms. 



Species and noticeable Varieties from Oran^ figured hy 

 Eh'enherg. 



1. Bolivina punctata, i?' 0>'Z». 



2. dilatata, Rss. 



3. Virgulina Hemprichii (Ehr.). 



4. Textilaria gibbosa, Z)' Orb. 



5. Glohigerina bulloides, Z)' Orb. 



6. Planorbulina aramonoides (Mss.). 



7. Pulvinulina spatiosa {Ehr.). 



V. The deposit yielding the Microzoa figured in pi. xxii. is 

 described as a white, chalk-like, thinly laminated " marl," 

 analogous to tripoli, from Caltanisetta, in Sicily. It Avas ob- 

 tained by the late Mr. Hoffmann ; and in his MSS. it was 

 termed " white chalkmarl," and referred to the Cretaceous 

 rocks dipping at a high angle below miconformable Tertiary 

 deposits. Ehrenberg, however, identifies these laminated 

 marly beds, containing numerous fishes, found between Calta- 

 nisetta and Castrogiovanni, near the middle of Sicily, with 

 the diatomaceous earth from near Oran, above treated of. 

 Between the two Sicilian localities mentioned above, Creta- 

 ceous rocks certainly are exposed ; but others of Tertiary age 

 also abound, including, we believe, the diatomaceous calca- 

 reous earth, with Clnpea tenm'ssima, already referred to ; and 

 if this white earthy siliceo-calcareous deposit (which is not a 

 "marl" in the correct sense), abounding with Coscinodisci and 

 Glohigerina^^ ^ be the same as that to which Ehrenberg alludes, 

 there is no doubt of its Tertiary age. 



WMte Chall'y Marl [?] of Caltanisetta^ Sicily. (Abhand. 

 Berl. Akad. Wiss. 1838, pi. 4. fig. xi. Monatsb. 1840, 1844. 

 Ann. Nat. Hist. vii. p. 313.) 



PI. xxii. figs. 1-73. Diatomacege, Polycystina, Spongo- 

 liths, &c. 



* We have some of this rock, from Sicily, in oiu* own collection. 



