470 Miscellaneous. 
Pedicels of feet surrounded with flattened strap-shaped spicules, 
generally arcuate, sometimes slightly dilated in breadth in the 
middle, or at this part throwing out a lobe; the spicule is per- 
forated with a few foramina, which, except in the case where the 
spicule is dilated centrally, are usually arranged in single file. 
Terminal plate not observed in this specimen. 
Tentacle-spicules: the larger very like in general character to 
those of the pedicels, but Aen a little expanded at the extremities 
and bearing in that part three or more foramina; other spicules are 
cribriform, often elongate, more generally very irregular in form; 
the smallest of these, which clothe the extremities of the amieee 
tions of the tentacle, are very delicate in their structure. 
Specimen B.—Body-spicule like that of A, but only a spicule here 
and there showing any nodulous growth, the vast majority presenting 
a perfectly smooth surface ; nor are they so universally confined to 
the number of four foramina, the spicules often having an addi- 
tional foramen at each end (7. e. four in a direct central longitudinal 
line); among them were also very many in an early stage of 
growth, spectacle- formed, two foramina being united by the central 
bar. No bell-shaped spicules have been found in this specimen, 
though they have been thoroughly sought for. Pedicels with 
lateral spicules, some just as in A, but here more generally with 
about three small foramina at each end; termination of pedicel with 
an arborescent delicate cribriform plate in the centre, and at the 
edges several much stouter cribriform plates of irregular outline (it 
is possible that these disunited plates ultimately coalesce into one 
cap). Tentacle-spicules as in A. 
Specimen C.—Young, only 14 millim. long. Body-spicule exactly 
as in B, but here I could not find a single one that was nodulous, 
and no bell-shaped spicules. Pedicel-spicules as in B. Tentacle- 
spicules: the smaller of these, having to clothe very minute termi- 
nating branches of the tentacle, are much smaller than in A, and the 
ramifications greatly reduced in size, so that under a usual power of 
microscope for examination they look like little round or nodulous 
bodies, and it requires the use of a considerable power (? inch and 
high eyepiece) to reveal their structure. 
Ryecimion A corresponds very closely with Hérouard’s figures of the 
spicules of his “Semperia Drummondii,” the only slight difference 
being that the spicules he draws have attained a yet higher degree of 
calcification, especially shown in figs. 3 and 7, where. the foramina 
are much more contracted in size than i im my specimens. 
Specimen B corresponds closely with Th. Barrois’s figures of his 
Cucumaria Lefevrii, with this curious exception—in his fies. 4 and 5 
additional foranina are shown which are built on to the side, so 
that the number of /ateral foramina is increased. In mine a large 
number of spicules are enlarged beyond the usual four openings, but 
it isin almost every case in the central line, one at each end, and no 
tendency whatever is shown to increase laterally. 
My specimens were procured for me in 1865 at Polperro by the 
