Gutty Marine Lahoratori/j St. Aiidnws. 19 



wlicrc the scutes are somcwliat l)roa(ler and the incdiati 

 jj^roove is wider. The anterior region lias nine segments 

 with a wider antero-posrerior diameter than those wliicli 

 I'ollow, whilst tliese, again, are wider than the cauihd 

 segments. 



The colour of the hody is dull orange or of a salmon hue, 

 universally and minutely dotted with white grains. The 

 dorsal collar is pale, and is also minutely dotted with white 

 grains ventrally; the flaps are also pale with a brownish 

 edge — well marked in the anterior dimple of the first shield. 

 The ventral sciites are paler, but also minutely dotted with 

 Mliitc, and the ventral groove is reddish. The cilia of the 

 dorsal end carry loose bodies actively forward. 



The bristles of the second region are arranged like the 

 inferior group in front, viz. with the long diameter of the 

 row vertical, and they spring froni the tip in a double row — 

 that is, on each side of a ridge of tissue. The wings of 

 these are intermediate in character, being narrower than the 

 lower series and wider than the upper series of the first 

 region. Their tipa, however, are long, esi)eeially the upper 

 f(jrms, and finely attenuate. The chief changes in the 

 l)ristles toward the tip of the tail are the shortening of the 

 shafts and the great elongation of the tips, which stretch from 

 the side of the flattened body as finely-ta[)ered hairs. A 

 distinct curvature occurs at the commeucement of the 

 wings. 



Neural canals occur from the second setigerous segment 

 backward. The segmental organs are found in the first, 

 second, and third setigerous segments, and they open bv a 

 common canal. The anterior rows of hooks occupy the 

 summit of the rounded ridge, which begins close to the 

 setigerous process and passes ventrally neir the scute. Each 

 hook is avicular in shape, with a marked forwai'd curvature 

 of the posterior outline at tlie crown, a poweiful and sharp 

 main fang with a series of very minute serrations above it, 

 a neck of moderate length, and a long tapering base. J3oki 

 striie pass from the crown to the base, into which they 

 curve a little behind the prow. Each hook is accompanied bv 

 a short broad bristle, with a spatulate tij) bent at an angle and 

 ending in a point, or when seen obliquely the tip is hastate, 

 or on edge a hook-like organ. In a specimen from South 

 Devon in the ]3ritish Museum, both these and the hooks 

 had their '"heads'" tinted brown. The posterior ho(;I;s are 

 smaller, with a shorter neck and shorter base, and more 

 distinct serrations above the main fang. The tube is 

 leathery, coated externally with coarse sand niiii"l.(l with 



