POTTS— POLTCHiETA. 339 



most superior there are long spinous tips, but the length of the whole seta and of 

 spinous area decreases in passing ventrally. There is an acute incurved tip with a long 

 slender spine situated just under it. In L. crozetensis the spine is characteristically 

 short. 



This appears to be a widely distributed form in the Indian Ocean, and an interesting 

 feature is the great depth from which it was taken at Amirante. 



Localities. Amirante, E 18, 280 fathoms. Salomon ; 2 specimens. Coetivy ; 3 small 

 bottles. 



This species comes very close to L. crozetensis, Mcintosh, from the Crozet Isles, 

 which is characterised by " whitish papillose scales, long palpi, rapid diminution of the 

 body posteriorly, and the length of the dorsal bristles." A decided difference shown in 

 Mr. Gardiner's forms is the absence of marked posterior attenuation ; for the body is 

 in them narrow throughout, only tapering slightly posteriorly. la otlier characters 

 there is a general agreement with the ' Challenger ' form ; but in the configuration of 

 the head this species differs not only from L. crozetensis, but all other species of the 

 genus. 



17. Lagisca cornuta, sp. n. (Plate 19. fig. 14; Plate 21. fig. 48.) 

 Measurements. Length 21 mm., breadth 85 mm. with setse, 4-5 mm. without; no. of 



segments 36. 



Body rather narrow, but not so much so as in L. iiidica, and posteriorly tapers more. 

 Head (fig. 14) rather rounded, median tentacle comes off much more dorsally than 

 the lateral, which alone are preserved, and are very short ciliated structures with a 

 stout basal portion and filiform tip. Above the insertion of the lateral tentacles two 

 very prominent lateral peaks strongly incurved. Both pairs of eyes large, the anterior 

 being situated quite externally at the middle of the lateral border. The anterior part of 

 the head coloured purple, and sharply marked off from a non-pigmented posterior part. 

 Palps long, smooth, and tapering. Elytra are all missing. Setae of great length, and 

 arrangement similar to that in L. indica. Dorsal setae (fig. 48) very broad and nearly 

 as long as ventral, serrated right up to tip, and with a bifurcate apex. Ventral setie 

 very long, almost exactly like those of L. indica, with a very long slender spine under 

 the recurved apex. 



Locality. Salomon ; a single specimen from the surface reef. 



The chief differences between the above species and L. indica relate to the origin of 

 the lateral tentacles and the dorsal setae. 



18. Lagisca flaccida, sp. n. (Plate 18. fig. 11 ; Plate 21. figs. 49, 50.) 

 Measu7'ements. Length 20 mm., bi-eadth 6 mm. ; no. of segments 38. Another 



specimen was 18 mm. in length, 6 mm. in breadth, and with 36 segments. 



Body very flattened, and parapodia very short compared to the body, affording a 

 difference between this and the last two species. Breadth fairly uniform, tapering 

 slightly just before posterior end. Anterior end rounded. 



Head hexagonal, with small distinct eyes, the anterior placed just in front of the 

 outermost angle of the head, the second pair close to the posterior border. There are 



