484 GLYCERA SIPHONOSTOMA. 



Portan, near Lochmaddy, and at Paible. Scottish Fishery Board, Station LXVI, off 

 Cromarty? Plymouth (Allen). Coimemara (A. G. Moore). One hundred and ten 

 fathoms, thirty miles west of the Blasquet, south-west Ireland, ' Porcupine,' 1870. East 

 coast of England. Loch Goil (E. W. Hoyle, 1878). 



' Porcupine,' 1870, off Cape Guardia, Shores of France. Shores of the Adriatic, 

 Lussin Piccolo (Grube). Quarnero (Ehlers). Canada. Japan (Moore and self). Off 

 Fayal in the Azores (' Challenger '). Madeira and Canaries (Langerhans). Off the Cape 

 of Good Hope (' Challenger'). Porto Rico (Treadwell). 



Head forming a conical process of thirteen segments. 



Body in life upwards of a foot long and nearly half an inch in diameter, a little 

 narrower anteriorly, and tapering more distinctly posteriorly. Each segment has two 

 rings, that bearing the foot being somewhat broader as a rule. In good examples the 

 surface of the body is thrown into a series of papillge, especially laterally on the ridges of 

 the segments, so that a tessellated aspect is given to the general surface, hence probably 

 the origin of the name given by Grube. 



Proboscis. — In the preparations this is a short, massive, clavate organ, having the 

 four powerful black hook-like teeth at the tip. The inner surface of the organ is 

 minutely papillose (Plate LXIV, fig. 8), each papilla being somewhat lanceolate in outline, 

 and many are obliquely streaked. The teeth are only of use for seizure after the 

 extrusion of the proboscis, which the animal ejects with much force. Claparede (1868) 

 attributes the coloration of this organ to reddish granular pigment between the muscular 

 fibres. He also observes that the perivisceral cavity is divided into two chambers by the 

 union of the dorsal muscles below the intestine. The body terminates posteriorly in two 

 short tapering cirri (Plate LXIV, fig. 8 a) . 



The nerve-cords occupy a similar position to those of G. lajpidum, and the area has 

 the same shape, and, as in that species, there are alternations in position according as the 

 section passes through the ganglia or between them. Two upper and several subsidiary 

 neural canals also are present. 



The dorsum has a pinkish blush, marked in front by the whitish opacity of the 

 retracted proboscis, and acquiring a very faint pale purplish hue posteriorly in contrac- 

 tion. Others have a uniform pale flesh-colour with a pale snout and a reddish patch 

 (ganglia) at its base. Some are mottled pinkish white, with the black jaws visible 

 through the integument, and a few are of a reddish flesh colour. A large example at 

 Herm had a general purplish skin colour. Posteriorly the gut in the pale forms tints the 

 central line brownish. 



The first foot has a large conical and a smaller lobe, a single spine, and two tufts of 

 bristles. 



At the tenth foot (Plate LXXVI, fig. 2) three main divisions appear in lateral view, 

 viz., a large digit-like dorsal, a smaller median, and a shorter ventral with a broad base, 

 though posteriorly the setigerous process also shows two small elevations of its edge. 

 The dorsal bristles are simple, translucent, tapered, with just a trace of a wing. The 

 ventral are compound. Two spines are present. An ovoid papilla (dorsal cirrus) occurs 

 on the body at the base of the foot superiorly, and is especially conspicuous anteriorly in 

 this form. 



