76 BRITISH SILURIAN BRACHIOPODA. 
with close concentric striz, as well as with minute punctures, and studded also with 
slender tubular spines, which are very wide at their base. 
Length 6, width 5 lines. Interior unknown. 
Obs. It is to Prof. Morris that we are indebted for the first description and figures 
of this interesting Brachiopod; and his article upon the subject is full of interest, for, 
besides describing the first-known British species of the genus, he gives us a translation of 
a portion of Dr. Kutorga’s valuable paper on the genus Siphonotreta. Speaking of 
S. Anglica, Prof. Morris mentions that the surface is ‘‘ minutely but concentrically reticu- 
lated ; reticulation regular, with quadrangular areolz, and covered with many slender, linear, 
tubular spines or their bases, somewhat quincuncially arranged; spines smooth, dilated 
at their base, a little above which they remain of uniform size throughout, or very slightly 
tapering, and are regularly and transversely sulcated or contracted, giving the spines a 
beaded or jointed appearance; the general form of the shell and quincuncial arrange- 
ment of the spines resemble 8. aculeata, Kutorga; but as that author does not figure or 
allude to any reticulated structure or the moniliform spines, this is considered to be 
distinct.” Prof. Morris was acquainted with a single, much compressed dorsal valve found 
by Mr. John Gray in Wenlock shale near Dudley ; but subsequently Prof. M‘Coy described 
the ventral valve from specimens in the shale nodules of Sunny Banks, Coniston, 
where, however, the shell is not so perfectly preserved as near Dudley. In his 
description, Prof. M‘Coy states that the “imperforate valve is suborbicular, depressed ; the 
perforate valve ovate, very convex in the middle, most so about one third from the beak ; 
beak produced, with a distinct perforation; surface of both valves with minute, close, 
imbricating, concentric striz, about fifteen m the space of one line, reticulated by 
minute close punctures, less than their diameter apart, their diameter equalling the width of 
the imbricating lines from each other.” 
SrpHonorreta MicuLa, M‘Coy, 1851. PI. VIII, figs. 2—6. 
SIPHONOTRETA MICULA, M‘Coy. Ann. Nat. Hist., 2nd ser., vol. viii, p. 389, 1851; and 
British Pal. Foss., p. 188, pl.i, , fig. 3, 1852. 
— — Salter. Siluria, 2nd ed., p. 212, fig. 3, 1859. 
— — Harkness. Geol. Mag., vol. ii, p. 431, 1865. 
Spec. Char. Shell minute, longitudinally ovate, as broad as long, posteriorly 
slightly acuminated, the front and side margins broadly rounded; valves very slightly 
convex, the ventral one most so, with a small circular foramen at its extremity. Surface 
marked with concentric laminar striz, and with very small punctations, having raised 
borders ; when perfect, there are numerous delicate short spines. 
A large specimen measured 2 lines in length by the same in breadth. 
Obs. Prof. M‘Coy, the first describer of this little species, states that it varies from 
nearly orbicular to ovato-pentagonal in outline. “In some specimens, particularly those 
