324 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
suggestion that the nucleus plays a considerable part in the movement 
of the pseudopodia, acting perhaps as a regulating centre. 
Natural System of Thalamophora.* — Dr. L. Rhumbler argues in 
favour of the following arrangement : — 
YI. Orbitolitidae. 
Later chambers around 
earlier, subdivided by 
supporting walls. 
Since Lias. 
Y. Miliolinidae.— 
Bead-like 
imperforate 
chambers, 
mostly cal- 
careous and 
coiled. Since 
Trias. 
, — VIII. Nodosaridee. 
Calcareous, finely 
perforate chambers, 
partly in a spiral. 
Since Carboniferous. 
In Lageninae the 
individual chambers 
have separated. 
IX. Endothyridse. — 
Sand-chambers in 
spiral rows ; partly 
calcareous and 
perforate. Since 
Carboniferous. 
IV. Nodosinellidse. 
Straight sand-tubes with 
bead-like chambers. 
Since Carboniferous. 
— X. Rotaliidae. 
Spiral rows of cal- 
careous perforate 
chambers, with a 
canal system in 
involute forms. 
Since Carboniferous. 
— VII. Textulariidae. 
Sand-chambers in 
rows, partly spiral 
and calcareous. 
Since Carboniferous. 
II. Ammodiscidae. 
Imperforate tubes, be- 
coming spiral for strength, 
partly calcareous. Since 
Carboniferous. 
— I. Rhabdamminidae. 
With imperforate sand- 
shells, originally more 
or less spherical, 
secondarily tubular. 
Girvanella in Silurian. 
—Ill Spirillinidee. 
Perforate, cal- 
careous, spiral 
tubes, partly with 
pocket-like diver- 
ticula of the 
peripheral wall. 
Archseodiscus in 
Carboniferous. 
Foraminifera from Trmidad4 — Mr. R. J. Lechmere Guppy describes 
some Foraminifera from the Microzoic deposits of Trinidad. He thinks 
that the species of Foraminifera have positively as definite a form as 
most other species of organic beings. He urges that in the so-called 
higher animals we are not unfamiliar with the occurrence or persistence 
of what are known as embryonic characters, and just as these characters 
have thrown most valuable light upon the affinity and course of develop- 
ment of these animals, so they probably will do the same in the 
case of the Foraminifera. He makes some remarks on the initial stage 
of Frondicularia , which leads him to a view of the evolution of this 
* Nachr. K. Gesellscb. Wiss. Gottingen, 1895, pp. 51-98. 
t Proc. Zool. Soc. Lond., 1894 (1895) pp. 647-53 (1 pi.). 
