338 PERCY SLADEN TEUST EXPEDITION. 



Head (fig. 12) small, very distinctly divided into two parts, each of which ends 

 anteriorly in very acute point. No sign of eyes. Median tentacle missing. Lateral 

 tentacle very minute and slender, origin from head rather ventral. Paljis small, stout, 

 conical, ending in a sharp tip ; surface smooth. 



Back narrow, parapodia rather elongated. Setae all project laterally. Notopodium 

 (fig. 31) much shorter than neuropodium. Dorsal cirrus extends as far as ventral setae. 

 Dorsal setae (fig. 42) fairly numerous, well developed, about half as long as ventral setse, 

 broad, slightly curved, with a rather blunt apex and numerous serrations (10-15), far 

 apart toward base, crowded together near tiji. Neuropodivim acutely pointed, with very 

 numerous set-se, with apex rather faintly serrated, not bearing recognisable spines ; 

 upper setae (fig. 43) with a very elongated serrated region, a short incurved tip, and 

 projecting tooth just under it ; in lower the same region is short and swollen, giving 

 a distinctly hastate appearance. 



Elytra mostly lost, but aj^pear to cover the back and are of type found in the two 

 preceding species, being almost circular, translucent, with entire margin, smooth surface 

 with delicate veinings, and occasional tiny chitinous tubercles. 



Locality. S. Male (2 incomplete specimens). 



Genus LAGISCA. 

 16. Lar/isca indica, sp. n. (Plate 19. fig. 13; Plate 21. figs. 46, 47.) 

 Measurements. Length 20 mm., breadth 7 mm. with setae, 3 mm. without; no. of 

 segments 39. 



Body narrow throughout, only tapering slightly at posterior end. Head (fig. 13) 

 pentagonal, w^hile in L. crozetensis (Mcintosh, pi. viii. fig. 6) it is ovate; anterior pair 

 of eyes are placed further forward than in the related species. Head is like that of 

 Lepidonotus, with the anterior border prolonged into the lateral tentacles, and all three 

 tentacles arising at the same level. All tentacles slender, ciliated, and end in filiform 

 tip, median half as long again as the lateral. Palps are in turn about one and a half 

 times the length of median tentacle, covered with cilia not so long and conspicuous 

 as those on the tentacles. Distinct nuchal fold behind the head and tentacular cirri 

 attain the size and development of the median tentacle. Dorsal cirri throughout long 

 and slender, extending as far as the longer ventral setae. Ventral cirri fairly long, but 

 hardly reach the point where the setae spring from the lobe of the notopodium. 



Elytra are ovoid, entirely cover the back, overlapping considerably, and are firm 

 with granular appearance ; in the centre is a broad crescentic mark of black pigment 

 and a concentration of the same pigment generally round the base of the spines. 

 In certain lights they are beautifully iridescent. In minute ornamentation elytra 

 exactly similar to those of L. crozetensis, covered densely with short sharp spines and 

 intermediately placed cilia and with short cilia on the postei'ior and outer borders ; 

 spines best developed in first elytron. 



Parapodia are long and slender, bearing upstanding long dorsal setie arranged in 

 a diverging tuft. The setae (fig. 46) are straight, acutely pointed, with very numerous 

 and bold rows of spines. The ventral setae (fig. 47) are comparatively fine. In the 



