592 MESSES. E. HEEON-ALLEN AND A. EAELAND ON THE 



regularly increasing in diameter and arranged in a rounded helicoid spiral. The 

 primordial chamber large, appearing as a clear vesicle at the apex of the spire. About 

 three chambers to each convolution, the lines between the convolutions being some- 

 what depressed, while the septal lines between the chambers are flush with the surface 

 and conspicuous only by the greater density of the material at this point in contrast 

 with the opalescent wall of the chambers. Inferior surface nearly flat, slightly 

 depressed in the umbilicus, showing four chambers, the aperture being a rounded and 

 slightly lipped opening on the marginal edge of the final chamber. The shell- 

 substance on the inferior side appears to be covered with a network of faint striae, 

 apparently caused by minute scratches in the shell-substance ; these markings are 

 not visible on the superior surface of the test. Breadth at base -SS-'oS mm. Height 

 •20 mm. 



This species, which is evidently the most highly developed type of the genus, occurs, 

 a few specimens only, at Stn. 11. It bears some external resemblance to minute shells 

 of the Pteropod Limacina, and might easily be overlooked. 



A single specimen of F. helicina has been identified by us on a type-slide mounted 

 by B. L. Mestayer, F.E..M.S., from a dredging made ofl' the "Poor Knights" Is., 

 Hauraki Gulf, New Zealand, depth 60 fathoms. F. jjellucida Millett also occurs in 

 the same gathering. 



Subfamily Peneroplidin^. 

 CoKNUSPiRA Schultze. 



108. Cornuspira foliacea (Philippi). 



Orbis foUaceus Philippi, 1844, EMS. p. 147, pi. xxiv. fig. 25 (error for 26). 

 Operculina ammonitifonnis Costa, 1853, etc., PEN. 1856, p. 209, pi. xvii. fig. 16. 

 Spirillina Joiiacea Williamson, 1858, RFGB. p. 91, pi. vii. figs. 199-201. 

 Cornuspira foliacea Mobius, 1880, FM. p. 7Q, pi. ii. fig. 3. 



„ Brady, 1884, FC. p. 199, pi. xi. figs. 5-9. 

 „ Egger, 1893, FG. p. 247, pi. iii. tigs. 20, 21. 

 „ „ Heron-Allen & Earland, 1908, etc., SB. 1911, p. 305, pi. ix. figs. 5, 6. 



„ „ Herou-Alleu & Earland, 1913, CI. p. 36. 



5 Stations. 



Karely occurring at the Stns. All the specimens are small and of the true Philippi 

 type ; none of the broad divergent type first figured by Costa as Operculina ammoniti- 

 fonnis, after him by Williamson {ut sup^a), and following them by all later writers 

 as C. foliacea, were found at Kerimba. In our experience the evolute Costa and 

 Williamson type is confined to the colder areas of the ocean or deep water. 



109. Cornuspira selseyeiisis Heron-Allen & Earland. 



Cornuspira? Earland, 1905, FBS. p. 199, pi. xiii. figs. 2-4. 



„ seheyensis Herou-Alleu & Earland, 1908, etc., SB. 1909, p. 319, pi. xv. figs. 9-11. 



„ „ Heron-Allen & Earland, 1913, CI. p. 37. 



