THT0NE. 4o 



(1872) p. 146, pi. iii. figs. 22-30; Lampert, Seewaken, (1885) p. 156 ; 

 Thee!, Cludl. Rep. Hoi. (1886) p. 135 ; 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 hody, 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. Hore or 

 less yellow or brown in colour. 



Distribution. British and Norwegian seas ; Mediterranean. To 

 155 fins. 



a-c. 60° 32' N., 0° 29' W., 64-75 ftns. ' Porcupine ' Exp. 



d-f. Faeroe Channel, 570 fms. ' Triton ' Exp. 



g-h. The Minch. ' Porcupine ' Exp. 



i-k. Dingle Bay, 40 fms. Royal Dublin Society. 



/. Shetland. R. McAndrew, Esq. 



3. Thyone flexus. 



Thvone flexus, Hodge, Trans. Northumb. 8f 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. Each 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 

 very narrow ; and exterior to these again, and close within the 



