354 Dr. R. Hausler on the Trochamminz 
norbiformis). Test thin, finely arenaceous, the sandy consti- 
tuents imbedded in a subtransparent colourless cement. 
Attached to the shells of Terebratule; very rare. ‘This 
species was first united with the Nubecularie; but the tex- 
ture of the shell places it with the Trochammine. W. 
planorbiformis is very variable, but easily recognized from its 
oldest part forming a regular flat spiral. The younger part 
of the tube often resembles 7. jilum, Schm., and Hyperam- 
mina, being irregularly bent and twisted. Often two or more 
individuals form small colonies on the shells of Brachiopoda. 
C. Hormosina, Brady. 
The group of straight or arcuate moniliform Trocham- 
mine is represented in the Swiss Jurassic series by several 
small species, none of which has, so far as I_ am aware, been 
recorded previously. While in respect of their external ap- 
pearance they are isomorphs of well-known Nodosarie (and 
Dentaline), with which I at first united them, their finely 
arenaceous tests place them nearest to the simple Zrocham- 
mine. Besides some doubtful lageniform modifications, 
which are probably mere isolated segments of multilocular 
varieties, we possess at least three different species from the 
Argovian zone of Ammonites transversartus, of which two 
are preserved in several perfect specimens, while the third is 
never found entire, and is therefore not determinable. 
The two species which I have described as Nodosaria chry- 
salis and N. transversarw are both good types of the genus 
Hormosina. 
1. Trochammina (Hormosina) chrysalis, Hiusl.* 
The description given of this form as N. chrysalis applies 
to all the specimens | had then collected from this zone, though 
since several others have been discovered in various localities. 
It appears that T. chrysalis is the most constant of all the 
Jurassic Trochammine. As the above-cited paper is out of 
print, it may be useful to repeat the description. 
Test straight, pupiform, composed of four or five segments, 
rapidly increasing in size. First chamber small, last long, 
almost half of the total length of the shell, slightly acuminated, 
bearing the small rounded aperture. 
Test finely arenaceous; cement colourless or slightly ferru- 
ginous ; surface smooth, resembling thus Z. incerta of the 
same beds. 
* Hiusler, ‘Untersuchungen tuber die microscopischen Structurver- 
haltnisse der Aargauer Jurakalke,’ p. 34, pl. ii. fig. 51. 
