SCOLBOOLBPIS (LAONICB) CIRRATA. 165 



1896. Laonice cirrata, Mesnil. Bull. Sc. Fr. Belg., t., xxix, p. 116. 



1897. Spio cirratus, Michaelsen. Polych. cleutsch. Meere, p. 152. 



1909. Scolecolepis (Laonice) cirrata, Mcintosh. Ann. Nat. Hist., ser. 8, vol. iii, p. 160. 

 „ Aonides cirrata, Fauvel. Bull. Inst. Ocean., 142, p. 4. 



1913. „ „ idem. Bull. Mus. Hist. Nat., No. 2, p. 9. 



1914. Laonice cirrata, Southern. Proc. Roy. Irish Acad., vol. xxxi, no. 47, p. 97. 



Habitat. — Dredged in 80 — 100 fathoms in St. Magnus Bay, Shetland, July 1867 ; 

 and in 85 fathoms in the same locality in 1868; 110 fathoms thirty miles west of 

 Blasquet, S.W. Ireland; in Valencia Harbour, May 1870 (Dr. Grwyn Jeffreys). S.W. 

 Ireland, 23—38 fathoms, long. 55, 1886; Ballinaskellig Bay (R. I. A.). Plymouth 

 (Spence Bate and Brooking Rowe). Clew Bay (Southern). From the contents of the 

 alimentary canal it would seem to be partial to fine mud. 



It ranges to Canada, 313 fathoms- (W. C. M.) ; Spitzbergen, Greenland, Sweden, and 

 Finmark (Malmgren). Atlantic coast, U.S.A. (Yerrill, Webster and Benedict) ; Siberian 

 coast and Behring Sea (Wiren) ; Kara-Havets (Levinsen). Large examples come from 

 Norway, 300 fathoms (M. Sars and Canon Norman). 



The head (Plate XCVIII, fig. 3) of this species is remarkably short, and the 

 snout is either smoothly rounded on the anterior edge, or slightly bilobed. A somewhat 

 triangular ridge with its base anteriorly passes backward and ends in a point posteriorly. 

 A small subulate tentacle springs from the apex. The eyes are situated on each side 

 of the ridge posteriorly, but in front of the tentacle. They are two in number. The 

 long tentacles are absent in every preparation, but the lamella at their base posteriorly 

 is present. 



The body tapers little anteriorly, so that with the shortness of the snout it has a 

 truncated aspect. The dorsum is somewhat rounded, whilst the ventral surface is 

 deeply grooved from the hind lip backward to the tip of the tail. From the broad 

 and deep anterior region the body gradually tapers backward to a moderately slender 

 tail, which ends in a regularly crenate margin with a series of long subulate cirri from 

 12 — 15 in number. Whilst the anterior part of the body is lamellar from the great 

 development of the flaps of the feet, the posterior region is considerably smoother 

 dorsally and laterally from the diminution of all the appendages. 



The first foot carries dorsally a small subulate branchia, and a large hatchet-shaped 

 lamella, with a conical edge superiorly, and a somewhat straight margin inferiorly. The 

 setigerous process in front of it has a fan-shaped series of rather long, slender, and 

 finely tapered wingless bristles, the most slender as usual being superior and pointing 

 upward. The ventral lamella is nearly as large, but it is bluntly conical superiorly, 

 and from this it curves downward to a sharp corner inferiorly. In the notch between 

 the lamellse are two small conical papillae. The ventral bristles are shorter, but as 

 finely tapered. No differentiation inferiorly is present. 



The branchia continues of considerable size anteriorly, though in lateral view the 

 great lamella somewhat overshadows it. At the tenth foot it forms a large subulate 

 organ tapering gradually from base to apex. The great and almost reniform dorsal 

 lamella succeeds the vertical diameter of the body, and though it does not reach the 

 ventral margin, yet it stretches considerably over the dorsum. The inferior margin is 



