THYONE. 43 
(1872) p. 146, pl. iii. figs. 22-80; Lampert, Seewalzen, (1885) p. 156 ; 
Théel, Chall. Rep. Hol. (1886) p. 185; Bell, Proc. R. Irish Ac. iv. 
(1886) p. 620. 
Body curved on itself, much narrower in posterior half or third, 
which looks more like a tail to the rest of the body, which is more 
or less irregularly semiovate. 
Deposits rather small, overlapping plates with a varying number 
of holes. 
Half an inch to an inch or an inch and a half in size. More or 
less yellow or brown in colour, 
Distribution. British and Norwegian seas; Mediterranean. To 
155 fms. 
a-c. 60° 32' N., 0° 29' W., 64-75 fms. ‘ Porcupine’ Exp. 
d-f. Faeroe Channel, 570 fms. ‘ Triton’ Exp. 
g-h. The Minch. ‘ Porcupine’ Exp. 
t-k. Dingle Bay, 40 fms. Royal Dublin Society. 
Z. Shetland. R. McAndrew, Esq. 
3. Thyone flexus. 
Thyone flexus, Hodge, Trans. Northumb. § Durh. Nat. Hist. Soc. 
i. (1867) p. 44. 
“ Body-spicules (or plates) of varying forms and dimensions ; 
perforations round or slightly oval; on their first formation four 
such perforations are arranged round two nodules, which, when 
viewed sideways, are seen to be two stalks, meeting at the top, and 
terminating in several minute points; in some cases, that of large 
plates, three of these ‘ nodules’ are present. The prevailing shape 
of the plates nearly square, with eight perforations. This form is, 
however, soon lost in the further growth of the plate, which seldom 
again presents any regular outline. Feet-spicules much curved, the 
convex or upper part being produced into two stalks meeting at the 
tips, and having a triangular opening between them. LEach foot 
furnished with a plate at the extremity, irregular in outline, with 
numerous irregular perforations, the larger being concentrically 
arranged,” 
I have not seen this species, of which, so far as I know, only one 
specimen has ever been obtained. 
4, Thyone elegans. 
Thyone elegans, Norman, Rep. Brit. Assoc. 1868 (1869), p. 317. 
“Length 1-2 inches, Body smooth; skin thin, very delicate, 
totally devoid of all calcareous imbedded spicula: feet numerous 
but not crowded, scattered all over the body, their sides without 
spicula, but a large round spiculum at the extremity. This spicu- 
lum has round perforations in the centre, exterior to these a circle 
of large radiating wedge-shaped openings, the spaces between them 
yery narrow; and exterior to these again, and close within the 
