Trof. T. R. Jones and W. K. Parker — On Foraminifera. 509 



the cloudy, or seemingly muddy, opacity of its shell, — a structure 

 beautifully engraved in pi. xxix., fig. 38, and elsewhere. This 

 species is very common in the Indian seas, with its misty, dull shell, 

 of variable growth, sometimes regularly Virguline, with alternate 

 chambers, sometimes passing into Bulimina proper, sometimes short 

 and nearly round, like Cassidulina, and in other sub varietal shapes. 

 It is the only VirguUna that takes on a sandy condition, becoming 

 subarenaceous, and thereby very delicately rugose. Ehrenberg 

 appears to have first noticed it in the Tertiary Limestone from 

 Thebes, Egypt. In pi. xxiv., illustrating the Foraminifera from 

 that rich rock, he gives the name StropJioconus Hemprichii to a fine 

 complanate specimen (fig. 32) ; some smaller individuals, figs. 29, 30, 



31, he puts under the same genus, and another as " Textilaria ? or 

 Grammohotrys. " His " StropJioconi " are all either VirguUnoe or 

 BulimincB ; therefore the name is not required. Other instances of 

 V. Hemprichii (fossil) occur at pi. xix., fig. 86 (?), ^Egina; xxi. fig. 

 88, Oran; xxiii., fig. 19, Mokattam ; xxv., fig. 15 (?), Antilibanon ; 

 xxvi., figs. 19—24, 26, 27, Cattolica ; xxix., figs. 32—36, Moen 

 Chalk; xxx., figs. 18, 19, 21, Eiigen Chalk; xxxii., ii., figs. 18, 20, 

 Mississippi Chalk ; xxxiii., xiii., fig. 27 (?), San Francisco. Of these 

 some are remarkable ; for instance, the Vaginulina ? paradoxa and 

 V. obscura (xxvi., 26, 27) are nearly cylindrical and subarcuate, 

 such as occur in the Jurassic Clays, in the Oault, and in the Chalk ; 

 they are old "Secondary" Virgulince. A variety, xxx., fig. 18, termed 

 " Polymorphina nucleus," shows a passage into Cassidulina. An out- 

 spread, rhomboidal, and suboblong Textilariform variety is seen in 

 xxxii., II., figs. 18 and 20, termed " Grammostomum tessera, " and 

 " Pleurites ? Ame^-icanus." 



PL xxviii., fig. 31, Heterostomum cyclostomum, and 33, Grammos- 

 tomum platytheca are young, broad, coarse-shelled Textularice gibbosce. 



32. See above. 34 — 42a., variously named " Botalice" (including B. 

 globidosa, 1838, figs. 40, 41), are so many individuals of Globigerina 

 cretacea, D'Orb., an outspread, flattish variety of Gl. bulloides, D'Orb., 

 smooth in the youngest (41, 42), coarser and prickly in older speci- 

 mens. 



43. Plamdina ompJialolepta {PI. turgida, 1838) is a small and 

 somewhat complanate Cristellaria rotulata, Lamarck sp., or feebly 

 keeled Cr. cultrata, Montf sp. 44. PL annidosa is a still smaller 

 specimen. 45a, 6. PL odontoplicBna is Grist, cultrata, Montf. sp. Fig. 

 45a has tear-like and ridgy exogenous growths of shell-matter near 

 the umbilicus, but no umbo. 46. PL hexas (Bosalina globidaris ? 

 1838) is Cr. cidtrata with a small keel. 47. Botalia prcetexta is a 

 produced suboval individual of Crist, cidtrata. 48. Plamdina 

 adspersa is probably a small Cr. cidtrata or rotidata. In fact, figs. 

 43 — 48 show various stages and conditions of growth of the common 

 Cristellaria of the Chalk, in its umbilicate condition, and with more 

 or less of a keel or crest. 49. PL umbilicata, also 54, Cristellaria 

 megalompliala, and 55, Cr. Anglica, are limbate specimens of Cr. 

 cultrata, that is, having the shell thickened over the septal lines. 

 50, Botalia lenticulina, 51. B. Londinensis, and 52. B. lepida, are 



