AMPHITBITE OIRRATA. 109 



Abroad it occurs at the following: Greenland (Michaelsen) ; Lussin (Grube); Norway 

 (Hathke and Appellof) ; Sweden, Finmark and Spitzbergen (Loven, Norman) ; Iceland 

 (Leuckart, Forell) ; Greenland (Forell, Ditlevsen and Amondsen) ; Nova Zembla, Gulf of 

 St. Lawrence (Mel.) ; Godhavn Harbour, Disco., "Valorous," 1875 (Mel.) ; Adriatic and 

 Mediterranean (Grube, Panceri, Verany, Marenzeller) ; White Sea (Ssolowiew) ; New 

 England and Atlantic Coast, U.S.A. (Verrill) ; Barentz Sea (Mcintosh) ; Siberian and 

 Behring's Seas (Wiren) ; Spitzbergen and the Mediterranean (Fauvel) ; Franz-Joseph 

 Land (Augener) ; Canada (Whiteaves). 



The cephalic plate is comparatively adherent, for the dorsal collar is restricted, and 

 the edge externally bends over into that of the supraoral fold, the whole plate being 

 more limited than usual. A sub-oral fold occurs within, and externally is the lower 

 lip on the ventral border ; the dorso-lateral continuation of the lip bears the first group 

 of branchiae. The tentacles have the normal structure and a deep groove. The segment 

 following the foregoing has no distinct shield, the anterior edge ventrally forming a free 

 border and ending laterally on each side in a rounded free flap. A second free anterior 

 rim follows, also ending laterally in a rounded flap opposite the second branchia. 

 In the middle line is a large shield which sometimes indents the segment behind it. 

 Opposite the third branchia and the first bristle-tuft is a third rounded external flap, 

 which passes further dorsalward than the other tAVO. It abuts on a narrower shield 

 than the one in front. 



The branchiae are three in number, arising from the second, third and fourth 

 segments, and each forms a series of long, simple filaments which are attached to 

 a single basal process. The tufts on each side are separated transversely by a 

 considerable space. 



The body is enlarged anteriorly, and gradually tapers posteriorly to the terminal 

 anus. Dorsally it is rounded ; ventrally are about ten to twelve shields anteriorly, and 

 then a median groove passes to the posterior end. Seventeen pairs of vertical, flattened 

 setigerous processes occur anteriorly, the first being in a line with the last branchial tuft. 

 The bristles (Plate CXXV, fig. 5) are dull golden and in two series, a longer and shorter ; 

 the former are deeply inserted, have shafts nearly of uniform diameter throughout, 

 and have comparatively short tapering tips with wings which are broad at the 

 commencement, but taper distally. The condition of the tip, however, is variable, 

 apparently from injury, since many are short with short and broad wings and tips 

 that taper little — the result in all probability of injury. The shorter series has 

 winged and tapering tips, though a few at the edge present short (broken P) tips 

 with broad wings. ' A minute papilla occurs on the ventral side of the setigerous process 

 from the second to the eighth bristled segment. Moreover, just below the papilla a 

 little flap is developed at the dorsal end of each hook-row, and sloping backward behind 

 it from the first bristled segment (which has no hooks) to the last, where, however, 

 it is less distinct. No hooks occur opposite the first bristle-bundle; a single row is 

 present on the next foot, and for several feet thereafter, but the eighth has two rows. 1 

 The hooks (Plate CXXV, figs. 5 and 5 a) have in lateral view about four teeth above 



1 From the eleventh to the twentieth segment the hooks are in a double row and semi-opposite 

 (Lo Bianco). 



