368 RR. Etheridge, jun.—Carboniferous Tubicolar Annelida. 
x 
at present known by being attached at times only by a part of its 
surface on one side of the tube, and in the presence of the longitudinal 
microscopic striz. It agrees with O. minor and O. intermedia in the 
absence of the cellular zone described as existing in O. conica, whilst 
the absence of any lateral expansions at once separates it from 
O. intermedia, and O. striatula, Hichwald. On the whole, it probably 
is most nearly allied to O. minor, Nich., and O. Devonica, Pacht. 
Loc. and Horizon.—Found at a large number of localities, amongst 
which may be mentioned—Galabraes Quarry, near Bathgate, in shale 
below the Bathgate Limestone ; Roscobie Quarry, near Dunfermline, 
in shale above the Roscobie Limestone ; Fullarton Quarry, near Edin- 
burgh, in shale between the bands of the No. 2 Limestone; Fulwood 
Old Quarry, near Carluke, in shale above the main limestone, all 
‘horizons in the Lower Carboniferous Limestone Group (J/r. J. Bennie). 
Shore, east of Ravenscraig Castle, Fife, in shale above the Gair 
Limestone; Westerhouse and Gair Quarries, in shale above the 
Gair Limestone, horizons in the Upper Limestone Group (Mr. J. 
Bennie). The typical locality given by Mr. Young is Brockley, near 
Lesmahagow. 
Vi1.—Genus Ditrupa, Berkeley, 1835. 
(Zool. Journ. vy. p. 426.) 
Gen. char.—“ Shell free, tubular, open at both ends” (Berkeley). 
Obs.—Certain fluted, or ridged tubes, found in the Carboniferous 
rocks of Vise and Tournay, have already been referred to Berkeley’s 
genus Ditrupa by Baron de Ryckholdt, under the name of D. Carbo- 
nifera.! Judging from the figure this does not appear to partake of 
the characters usually met with in this genus in a sufficiently clear 
manner to render it absolutely certain that we are dealing with a 
species of it. The same author’s Ditrupa Devonica appears to be a 
more satisfactory determination, even to the presence of the transverse 
wrinkles or undulations of the surface. If truly a Ditrupa, then the 
latter species is the oldest form on record, being found in Devonian 
rocks. 
The following species, which I now describe under the name of 
Ditrupa Ryckholdti, comes much nearer in general characters to the 
recent species than does that of Baron de Ryckholdt, from Vise and 
Tournay. 
19.—Ditrupa Ryckholdti, sp. nov. (Plate VII. Fig. 41.) 
Sp. char.—Tube small, elongate, slightly curved, plain, smooth and 
hollow, tapering very gradually, with a few small constrictions towards 
the larger end, giving to the surface a broadly annulated appearance ; 
ornament none. 
Obs.—Side by side with the figure of this little fossil I have given 
one of a recent Ditrupa, from the coast of Madeira. This comparison 
will at once show the very close resemblance existing between the 
two. In Pl. VII. Fig. 42, the recent form, are seen numerous con- 
strictions commencing at about the middle of the tube and continuing 
1 Mém. Cour. etc., PAcad. R. de Belgique, 1852, xxiv. p. 125, t. 6, f. 25. 
