1885.] MOLLTJSCA OF THE ' LIGHTNING ' ETC. EXPEDITIONS. 2" 



the apparent absence of incremental striae, wiiich are only observable 

 with a lens. On the base this similarity is at once lost through 

 the small, almost microscopical umbilicus and its convex form. 

 The species belongs to the section Conulus of Fitzinger, and may 

 be described as follows : — 



^ 



Hyalina layardi. 



Hyalina (Conulus) layardi, sp. n. 



Testa viv perforata, orbiculato-pyramidata, tenuis, superne fub- 

 lente vix striatula, inferne distinct ius striata, oleuso-nitens, 

 corneo-lutea, sutura impressa ; anf r actus b, convexiusculi ; ulti- 

 mus rotundatus, antice non descemlens, gubtus convexus ; aper- 

 tvra verticalis ; perist. simplex, mctrginibus callo tejiui junctis, 

 hasali convexo, subexcavato columellari vix rejlexiusculo. 



Diam. maj. 5, min. 4i, axis 3 mm. 



Hah. Vate Island, New Hebrides. Coll. E. L. Layard and J. H. 

 Thomson. 



6. On the Mollusca procured during the 'Lightning' and 

 'Porcupine' Expeditions, 1868-70. (Part IX.') By 

 the late J. Gwyn Jeffreys, LL.D., F.R.S., F.Z.S.^ 



[Received January 13, 1885.] 

 (Plates IV., v., VI.) 



GASTROPODA {continued). 



Family XIX. Ianthinid^. 



1. Ianthina exigua, Bruguiere, Encycl. Me'thod. pi. 4.56. f. 2, 

 a, b ; Reeve, Couch. Icon. Ianthina, pi. v. f. 21, a, b : B. C. iv. 

 p. 188. 



1 For Part I. see P. Z. S. 1878, p. 393 ; for Part n. see P. Z. S. 1879, p. 553; 

 for Part III. see P. Z. S. 1881, p. 693 : for Part IV. see P. Z. S. 1881, p. 922 ■ 

 for Part V. see P. Z. S. 1882, p. 656 ; for Part VI. see P. Z. S. 188.3, p. 87 ; for 

 Part VII. see P. Z. S. 1884. p. Ill ; and for Part VIII. see P, Z. S. 1884, p. 341. 



^ [Dr. Jeffreys died suddenly on January 24, 188.5, four days after the reading 

 of bis paper at the Society's Meeting. By the request of his family I have 

 undertaken to see my much lamented friend's manuscript through the press, 

 but I would wish it to be understood that I do not therefore subscribe to the 

 views and determinations given therein. — Edgar A. S.mith.] 



