VAGINULINA OBLIQUESTRIATA. 231 



3. Vaginulina OBLIQUESTRIATA, sp. nov. Plate V, figs. 9, 10, 11. 



Characters. — This Vaginulina is stout, subcylindrical, varying from straight to 

 arcuate : fig. 11 is the straightest ; fig. 9 has a gentle curve ; and fig. 10 tapers 

 and bends like a Dentalina. The chambers are closely set, marked ofi" by very 

 slightly oblique septa. The surface-ornament consists of rather strong, oblique, 

 longitudinal costulse, either extending the whole length of the shell (fig. 9), or 

 interrupted at the sutures (figs. 10 and 11). These riblets are most oblique in 

 fig. 10, less so in fig. 9, and are almost straight in fig. 11, 



Although compact and ribbed this form is not so much compressed as the flat 

 V. striata, d'Orb. (after Soldani), which is the type of var. 6 at page 66 of Part I, 

 and it seems to require a distinct name. 



A somewhat similar, but much stronger ornament is observable in the 

 Dentalina divergens, Reuss, 1864 (' Sitz. k. Akad. Wiss. Wien,' vol. 1, p. 456, pi. iv, 

 fig. 10), with its strong oblique interrupted costulse. 



Of the various published Vaginulinse related to F. linearis the following have 

 oblique strice. 



1858. Williamson, ' Eee. Brit. For.,' pi. ii, figs. 46, 47 {Dentalina legumen, var. 



linearis). 

 1866. J., P., and B., ' Monogr. For. Crag,' pi. i, fig. 10 (Vaginulina linearis). 

 1882. Goes, K. Sv. Vet.-Ak. Hand!., vol. xix, No. 4, pi. ii, fig. .33 {JSfodosarina 



legumen, var. linearis). 

 1884. Brady, Eeport ' Challenger,' pi. l.xvii, figs. 10, 11 {Vaginulina linearis). 



Occurrence. — The figured specimens are in the Searles-Wood Collection, from 

 Sutton, in the British Museum. 



Genus 5. — Rhabdogonium, Beuss, 1860. 

 Brady, Report ' Ghallenger,^ 1884, pp. 70 and 524. 



Synonyms : 



Vaginulina. — d^Oriigny, Parker, Jones, and Brady. 

 Orthocebina. — d'Orhigny, Carpenter, Blake, Biltsclili. 

 Teiplasia. — Beuss, Costa. 



E,HABDOGONitrjr. — Beuss, Karrer, von Giimbel, von Hantken, Terquem, Schwager, 

 Brady, Berthelin, Quenstedt, and others. 



A Xodosarian test, straight, or slightly curved, angular or subcarinate ; 

 usually tri- or quadrangular in transverse section : chambers somewhat oblique or 

 arched. 



