May 4, 1888.] 



SCIENTIFIC NEWS. 



41; 



FORAMINIFERA.— II. 



( Continued from page 390J 



THE group of the Arenaceous Foraminifera is well 

 represented here by Reophax scorpiiinis, Montf. (fig. 

 9), the animal of which constructs a test of very irregular 

 fragments. The series of chambers commence in slender 

 form, rapidly increasing in width and forming together 



Arenaceous. The figure is taken from a specimen out of 

 the London clay of Piccadilly; it is also common in 

 recent soundings. 



Lagena, a one-chambered flask-shaped shell, is one of 

 the starting-points of many Hyaline Foraminifera which 

 are beautiful adaptations and arrangements of this simple 

 form on certain plans, resulting in a great diversity of 

 forms. L. squamosa, Mont, sp. (fig. 11.), is a form the 



Fig. 15. — Uvigerinaas- 

 perula. Czyzek. 

 X 80. 



Fig. 



13. — Nodosaria 

 raphaiius. Linn6 

 Sp. X 30. 



Fig. 9.- 



-Reophax scorpiiirus. Montfort. 

 X 3°. 



Fig. 14. — Cristellaria cul- 

 trata. Montf. Sp. 



Fig. 13. — Denialina 

 adolphina. d'Orb. 

 X 3°. 



Fig. 17. — Rotalia becca- 

 rii. Linne Sp. 

 X 3°- 



Fig. 18. — Polysiotnella o'ispa. 

 Linn^ Sp. x 30. 



Fig. 16.- 



-Glohigerina bulloides- 

 d'Orb. X 30. 



Textularia aggliitinans. 

 d'Orb. X 30. 



a curved or crooked line. It is an abundant form both 

 in arctic and tropical seas, and has been recorded in the 

 fossil condition from Switzerland in rocks of Jurassic age. 

 The test varies in regard to its composition according to 

 the surrounding material from which it builds, using 

 spicules, shell or coral fragments, or other substances. 



Textularia aggliitinans, d'Orb. (fig. 10), a good 

 example of the Textularian forms, consists of a double 

 series of alternating chambers, with the aperture slit-like. 

 This type is decidedly Arenaceous, others, especially the 

 smaller varieties, are .Hyaline, or only partially 



surface of which is covered with a scaly decoration. The 

 specimen figured is from the Pliocene beds of St. Erth, 

 but it is also found widely distributed, both as to depths 

 and localities, at the present time. Nodosaria, a genus 

 characterised by a simple rectilineal series of Lageniform 

 chambers, is represented here by A'', raphanus, Linn^ sp. 

 (fig 12), from the Gault of Folkestone : it has occurred as 

 far back as the Trias. It is a very variable form both in 

 size and conformation. The sub-genus Dcntalina, which 

 differs only from the preceding by the shell being curved 

 instead of straight, is illustrated by D. adolphina, d'Orb 



