220 
V ermes. —T ubicol a. 
Spirorbis ammonius. Milne Edwards, var. truncata , var. nov = 
Plate XXXVI., Fig. 9. 
This interesting little annelid tube is frequent on the weathered surfaces 
of the Buchan limestone in the present collection. It is closely allied to the 
type species 1 , found by Goldfuss in the Middle Devonian of Germany 2 ; 
having a spiral tube divided by varices or ridges at moderately regular 
intervals. Our specimens differ invariably in having one face almost flat, 
the other strongly convex; whilst the ridges tend to give place to cor¬ 
responding depressions, thereby imparting to the shell an appearance of 
the foraminiferal test of a Truncatulina. An interesting feature of this 
variety is the mode of attachment; which is by the side of the tube and not 
on the flat coiled face as in Spirorbis omphalodes, Goldfuss 3 . The strong 
annular lines of growth common to the Serpulidce are well seen in these 
examples. A frequent character in our specimens is the tendency of the 
later part of the tube to be partially uncoiled, as is sometimes seen in 
.S', omphalodes , the commoner spirorb of the Devonian system. 
Measurements. —The diameter of the coiled portion of the tube measures 
from 2 to 3.5 mm. Average width of tube at mouth, 1.75 mm. 
Pelecypoda. 
Conocardium cf. sowerbii , de Koninck. 
Cardium aliforme (var.), Sowerbv, 1840, Trans. Geol. Soc. Lond., 
ser. 2, vol. V., PI. LVI., Fig. 2. 
Pleurorkynchus aliforme , J. Phillips, 1840, Pal. Foss. Cornwall, p. 
34, PI. XVII., Fig. 51. 
Conocardium sowerbyi , de Koninck, 1887, Foss. Pal. Nouv.-Galles du 
Sud, p. 109; idem 1898, Descr. Pal. Foss, Blew South Wales.—Mem. 
Geol. Surv. N.S.W. Palseont. No. 6, p. 87. 
There is little doubt that the examples before us belong to the above 
species; but since it is a weathered specimen with a much etched surface, 
it is referred to it with some reservation. It is important to note that this 
species was met with by de Koninck in black argillaceous limestone of 
Devonian age in the'Yass district, New South Wales. 
Gasteropoda. 
Mure his onia sp. 
Plate XXXVI., Fig. 8. 
A small species of this genus is fairly abundant in the Buchan lime¬ 
stone. In the thin sections it is seen to have sub-angulated whorls, and an 
umbilicus. A weathered example shows a trace of a median slit-band. The 
shell is minute, being only 6.75 mm. in length in the largest weathered-out 
example in this limestone. Whorls about seven, the sides giving an apical 
angle of 30 deg. The present specimens are not well enough preserved to 
1. Spirorbis ammonius, Milne Edwards (in Lamarck), 1818, Hist. Nat., vol. V., p. 616. 
2. Serpula ammonia, Goldfuss, 1826, Petrefacta Germanise, vol. I., p. 225, pi. LXVII. Fig. 2. 
3. Serpula omphalodes, Goldfuss, 1826, tom. cit., p. 225, pi. LXVIT., Fig 3. 
