10 PROCEEDINGS OF THE NATIONAL, MUSEUM voi,. 72 



with a high secondary fimbriate keel along the suture ; wall coarsely 

 perforate; aperture elliptical, with a distinct contracted neck and 

 thickened lip. 



Diameter 0.40 mm. ; thickness 0.15 mm. 



The types of this species are from the Pliocene of Italy near 

 Siena. I have excellent specimens from the Pliocene of Calabria and 

 have collected it myself from the Pliocene of Coroncina, near Siena, 

 Italy. 



This is one of the most striking and most highly ornamented 

 species of the genus, apparently very specialized and becoming 

 extinct in the Pliocene. 



LIVING SPECIES 

 SIPHONINA TUBULOSA Cushman 



Plate 1, figs. 3 a-c, 5 a-c 



Truncatul'ma reticulata H. B. Brady (not Czjzek), Rep. Voy. Cliallenger, vol. 



9, 1884, pi. 96, figs. 5-7 (not fig. 8). 

 SipJiomna tubulosa Cushman, Carnegie Inst. Washington, Publ. 342, 1924, 



p. 40, pi. 13, figs. 1, 2. 



Test biconvex, slightly more convex on the ventral than dorsal 

 side, periphery acute, with a distinct keel, developing into tubules; 

 chambers usually five in the last-formed volution, very slightly in- 

 flated on the ventral side; sutures distinct, curved, slightly limbate; 

 wall with the surface often developing distinct tubercles or with 

 large perforations; aperture broadly elliptical with a distinct, con- 

 tracted neck and phialine lip. 



Diameter 0.50 mm. ; thickness 0.20 mm. 



The types of this species are from Samoa. Brady's figures ac- 

 cording to Nuttall are from Bass Strait and from Fiji. The species 

 has a distinctly Indo-Pacific distribution from the records. It may 

 be best distinguished by the distinctly separated tubules of the 

 periphery. 



SIPHONINA PHILIPPINENSIS, new species 



Plate 4, figs. 4 a-c 



Test small, unequally biconvex, the ventral side more convex than 

 the dorsal, periphery subacute, with a finely fimbriate keel ; chambers 

 usually five in the last-formed volution, not inflated; sutures curved, 

 on the ventral side distinctly limbate and in the last-formed ones 

 somewhat spreading on the surface or forming a secondary ornamen- 

 tation; wall only slightly roughened along the sutures; aperture 

 elongate elliptical, without a neck. 



