kongl. sv. vet. akademiens handlingar, band. 19. n:o 4. 87 



c) C lav u lina communis: 



PWautilus radieula Montagu, 1803, Test. Brit. p. 197, t. 14, fig. 6. 



Clavulina communis d'Orb., 1826, Tab. meth.; An. So. Nat. 7, p. 268. Frics Mod. No 10. 



» » d'OivB., 1846, Por. Bass. tevt. Vienne, p. 196, t. 12, figg. 1—2. 



» irregularis, communis Costa, 1854, Pal. Nap. 2, p. 270, t. 22—23, figg. 1—3; fig. 2. 



d) Cl a v. an gularis: 



u triquetra Ess., 1869, Oberburg; Wien. Ak. Dkschr. 1. 23. i, p. 6, t. 1, fig. 1. 



" tripleura Ess., 1865, Feuerstein-Kreide an. Kanara See; Wien. Ak. Sitz.-Ber. 52, p. 448, 



t. 1, fig. 1. 

 Szåboi Hken., 1875, For. Clav. Szåb. Sch. p. 15, t. 1, fig. 9. 



>) Philippiniea Kärr., 1878, Foramf. Luzou.; Bolet. Comis. Mapa geol. del Espaua, 7. 2, 



p. 11, t. E, fig. 4. 

 Clavulina parisiensis d'Orb., 1826, Tab. raeth.; Acad. So. Nat. 7, p. 268, Mod. 66. 



nodosaria d'Orb., 1839, Cuba p. 110, t. 2, figg. 19—20. 



Orthocerina clavulus d'Orb., 1826, Tab. metb.; An. Se. Nat. 7, p. 255, Mod. 2 (sec. Park. and 



Jones). 

 Clavulina angularis d'Orb., 1826, Tabl. Meth.; Ann. Se. Nat. 7, p. 268, t. 12, fig. 7. 



tricarinata D'OaB., 1839, Cuba p. 111, t. 2, figg. 16—18. 



Carp., Introduct. t. 11, figg. 17, 18. 



Valvuliiia triangularis dOrb. var. polyphragma n. 



Tab. XI, figg. 390—400. 



It is somewhat surprising, that this ^^Clavulina», which is one of the most frequent 

 rhizopodes on our chalk-bottom, has escaped the notice of our many and industrious 

 scrutinizers of the different tertiary strata, amongst the coristituents of which this spe- 

 cies also may be antieipated. The loosely agglutinated structure of its shell may have 

 prevented its more extensive preservation during the ages. 



Its Valvulina-stage proper, is ordinarely very short and owing to its strongly 

 agglutinant power the limits and arrangement of its chambers are nearly perfectly 

 raasked. This early stage seems sometimes to belong to the rotaline form of Valvulina. 

 Sometimes, but not so frequontly, it has a more produced (buliminoid) shape. The 

 most remarkable feature by our form is the high development of its uniserial stage 

 with its regular, handsome lituolina-like, radial subdivisions of the chambers. These 

 subdivisions vary in niiraber from 5 to 10 or rather from 10 to 20, each being sub- 

 divided into two branches. The aperture is usually closed by a thin cribriform lamina. 

 The surface of the shell, even in the young, is often studded with knobs and coarse 

 spines of accumulated chalkdebris. 



The shape of the whole varies from cylindric and clavate to ovoid, and globular. 

 The older ones assume ordinarely the ovoidform, resulting from the thick deposit of 

 debris, which render the outer layers soft, like white-chalk. It is devoid of siliceous 

 sand; but from the Atlantic Prof. Smitt and D:r Ljungman have braught home large 

 specimens somewhat adraixed with real and coarse sandy particles. 



