216 MESSES. BRADY, PARKER, AND JONES ON 



The broad apertural end and simple orifice are sufficiently characteristic to mark this 

 little shell as an Articulina; but whether a complete specimen or only the earlier 

 portion of a dimorphous species, we are unable to say with any certainty ; nor do we 

 know of any described species with smooth exterior. 



Found in the material from 31 fathoms. 



16. Articulina conico-articulata, Batsch, sp. (Plate XL. figs. 7-9.) 



Articulina conico-articulata, Chall. Report, p. 185, pi. 12. figs. 17, 18 ; pi. 13. figs. 1, 2. 



A few specimens, for the most part broken, in the sounding from 940 fathoms. 

 There are very similar forms in Prof. Parker's collection, from a Tertiary marl at 

 Baljik on the Black Sea. (Figures 5 and 6 are fragments of some larger organism 

 probably not Foraminiferal.) 



Ophthalmidium, Rubier. 



17. Ophthalmidium inconstans, Brady. (Plate XL. figs. 12, 13.) 



Ophthalmidium inconstans, Chall. Report, p. 189, pi. 12. figs. 5, 6, 7. 

 Occurs only in the deepest sounding. 



Planispirina, Seguenza. 



18. Planisptrina exi&ua, Brady. (Plate XL. fig. 4.) 

 Planispirina exigua, Chall. Report, p. 196, pi. 12. figs. 1-4. 



Only found, associated with the species last named, at 940 fathoms. 



19. Planispirina sigmoidea, Brady. (Plate XL. fig. 16.) 

 Planispirina sigmoidea, Chall. Report, p. 197, pi. 2. figs. 1-3. 



A single specimen, at 940 fathoms. 



Subfamily Peieeoplidina 

 Cornuspira, Schultze. 



20. Cornuspira involvens, Eeuss. (Plate XL. figs. 1-3.) 



Cornuspira involvens, Chall. Report, p. 200, pi. 11. figs. 1-3. 

 Found at three stations. 



Peneroplis, Montfort. 



21. Peneroplis pertusus, Forskal, sp. (Plate XLII. figs. 18, 19.) 

 Peneroplis pertusus, Chall. Report, p. 204, pi. 13. fig. 17. 



Some specimens present the more or less evolute nautiloid features of the typical 

 P. pertusus (fig. 18); whilst others (fig. 19) are thicker and completely involute, and 

 exhibit a tendency to produce the irregular aperture of the " Dendritine " forms. 



