LD) PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
MILIOLINA SEMINULUM var. DISCIFORMIS Williamson. 
Miliolina seminulum var. disciformis WILLIAMSON, Recent Foram. Gt. 
Britain, 1858, p. 86, pl. vu, figs. 188, 189. 
Resembling the typical form but more complanate and with 
broader, shorter segments, frequently emarginate at their umbilical 
borders and possessing transverse ridges of growth which are lacking 
in the typical species. Common along the English coast in shell 
sand. Occurs in every latitude and is known from all depths. Geo- 
logically its history dates from the early Eocene. Not very common, 
but present at Stations D. 4017 and H. 4694. 
MILIOLINA TRICARINATA (d’Orbigny). 
Triloculina tricarinata D’ORBIGNY, Ann. Sci. Nat., VII, 1826, p. 290, No. 7, 
modele, No. 94. 
Tricarinate milioline are not at all rare, but this species is more 
widely distributed than its related form J/. trzgonula. The carinate 
feature is in M/. tricarinata limited to the peripheral portion, the 
intervening portion being more or less gibbous, but the species is sub- 
ject to great variation and is perhaps easily confused with J/7lolina 
trigonula. While having an almost unlimited geographical distribu- 
tion the species is also of great bathymetric range and is known from 
a few fathoms down to 2,350 fathoms. As a fossil, it 1s recorded 
from the early Tertiary. Found at Stations D. 4000, D. 4025, D. 
4174, and H. 4694. 
MILIOLINA TRIGONULA (Lamarck). 
Miliolites trigonula LAMARCK, Ann. du Museum, V, No. 3, 1804, p. 351; 
Ninn, Sams Were, VIO ING, 2, We, jo Gil, 
Test regular triloculine, with smooth subspherical or elongate 
chambers and nearly circular end view. Distinguished from 4J/. 
tricarinata by a difference in the roundness or angularity of the 
chambers. Of wide distribution in shoal waters, and more frequent 
in the temperate than in tropical regions. Absent in cold northern 
waters; found chiefly in temperate in-shore sands. Beyond 100 
fathoms the form is said to be replaced by Miliolina tricarinata. 
Geological history, Tertiary to recent. Found at Stations D. 4000, 
D. 4017, D. 4025, H. 4568, and H. 4696. 
