482 GLYCERA SIPHONOSTOMA. 



Head long, attenuate, composed of numerous (apparently twenty-two) rings, with the 

 four minute tentacles at the tip, and two longer dorsal and two shorter a little below 

 (palpi of Ehlers). In the preparations the muscles of the snout are separated by a 

 median longitudinal streak. 



Body rather small, about three inches in length, tapering a little anteriorly, and much 

 more gradually posteriorly. The dorsal surface is rounded and marked by a slight 

 median groove. The ventral has a median ridge flanked by a groove at each side. The 

 segments are two ringed. The proboscis has rather long simple digit-like papillae slightly 

 tapered towards the tip. 1 The black jaws have a powerful, curved fang, and a broad 

 base which has two spurs, so that it is triradiate, but it is difficult to remove them 

 uninjured from the muscles. 



The typical foot (Plate LXXXVII, fig. 6) has a large dorsal cirrus at the base 

 superiorly, two well-marked pointed lobes near to and almost parallel with each other 

 anteriorly, and only a single short and rather deep lobe posteriorly. The ventral cirrus 

 forms a short conical lobe which does not project so far outward as the anterior lobes, the 

 tip, indeed, being in a line with the edge of the posterior lobe. Two spines are present. 



The dorsal bristles (Plate LXXXVI, fig. 4) are simple and long, with a slight 

 forward and then a backward curvature as the tip flattens before tapering to a delicate 

 tip. The ventral bristles (Plate LXXXVI, fig. 4 a) have a similar curvature of the shaft 

 which slightly enlarges, then is narrow below the expanded distal end, which is split for 

 articulating with the flattened and finely tapered terminal blade. One bristle near the 

 dorsal edge of the ventral fascicle is somewhat larger than those near it. 



3. G-LYOERA siphonostoma, Delle Chiaje, 1825. Plate LXIV, figs. 8, 8 a — proboscis and 

 tail; Plate LXXVI, figs. 2-2 c— feet; Plate LXXXV, figs. 4-4 b— bristles. 



Specific Characters. — Head a conical process of nine segments. 2 Body rounded, 

 upward of a foot long and half an inch in diameter, slightly tapered anteriorly, more 

 distinctly so posteriorly, where it terminates in two cirri. . Segments two-ringed. Colour 

 pinkish or pale skin colour, with a reddish patch from the brain, and a pale brownish gut 

 posteriorly. Proboscis massive — with four powerful black hook-like teeth. Papillae 

 lanceolate and streaked like a leaf. 3 Foot comparatively short, with an ovoid dorsal 

 cirrus at its base ; two long anterior broadly lanceolate papillge or lobes about equal in 

 length ; and two short blunt posterior lobes besides the ventral cirrus, which is of con- 

 siderable length and has the tip pointed, but it does not extend so far outward as the 

 anterior lobes. The nerve-cords are surrounded by a thick sheath of the neuroglia, to 

 the investment of which the muscular fibres are attached. Numerous nuclei and cells 

 more immediately surrounding the cords in the interganglionic areas stain deeply. The 

 sections would seem to show that the cords are circular in the interganglionic and 



1 Ehlers says they are leaf-like. 



3 Grube states that each ring bears minute processes (Harchen), probably palpocils. 



3 Grube describes them as stiff and thread-like. 



