56 



ches a length at the most of 36 mm., has no more than 36 segments, usually a dorsal feit, 

 1 5 elytra, eye-peduncles without pigment, dorsal spines with 3 to 4 alternate fangs and neuro- 

 podial bristles with numerous closel)- packed slender pinnae. L. prodjicta however can reach a 

 length of 100 mm., possesses 45 to 47 segments, 18 to 20 elytra and eye-peduncles provided 

 with eyes, whereas the glochideal spines possess 6 opposite fangs and the neuropodial bristles 

 are provided with few and stiffer pinnae. Considering that both species have a very wide geo- 

 graphical distribution and are found at different dephts, I think it rather probable that there 

 occur also varieties of both. 



2. Laetmonice vialayana Horst. PI. XIII, figs. 4 — 6. 



HüKST, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 1916, p. 73. 



Stat. 52. 9° 3'.4 Lat. S., 1 19° 56'. 7 Long. E. South oft' Flores. Depth 959 M. 4 specimens. 

 Stat. 161. 1° 10.5 Lat. S., 130° 9' Long. E. North off Misool. Depth 798 M. 5 specimens. 

 Stat. 178. 2°4o'Lat. S., 128° 37'. 5 Long. E. North off" Ceram. Depth 835 M. 18 specimens. 



At the above-named Stations several specimens were collected of a Laetmonice-?>\i&c[G.?>, 

 closely allied to L. filicornis. The largest of them (Stat. 161) has a length of 40 mm., but 

 usually they are not longer than 32 mm.; the number of segments amounts to 34 (PI. XIII, 

 fig. 4). They are especially characterised by their large dorsal spines, the shaft of vvhich 

 is provided on one si de with several series of distinct thorns; these bristles 

 are stout, dark brown, in the anterior segments reaching to the median body-region, whereas 

 those of the middle of the body extend beyond the anal extremity (PI. XIII, fig. 5). Their 

 distal end is provided with three small, triagonal, alternating fangs. The ventral bristles are 

 provided with a dense series of .slender pinnae, separated at their base by a short interval 

 from the spine beneath them, that is not very long, hardly a third of the length of the pinnae 

 (PI. XIII, fig. 6). No dorsal feit occurs. There are 15 pairs of elytra, usually not overlapping 

 each other, and covering the whole dorsum or leaving the middle of it bare; the ventral side 

 of the body is smooth, not beset with papillae as in L. jilicornis^ whereas its median region 

 is thin, translucent. The head bears on each side a long, cylindrical eye-peduncle, that in some 

 specimens shows an inconspicuous ring of pigment beneath the tip. The tentacle has a basal 

 part, nearly as long and broad as the eye-peduncles, and a slender distal joint, four to five 

 times longer than the head, with an elongated clavate tip. The palps are rather long, reaching 

 to the 10'^ segment; they taper distally and are beset with small hook-shaped papillae. There 

 is a large oval frontal tubercle, covered with conical papillae. 



3. Laetmonice rtis^osa Horst. PI. XIII, figs. 7 — 9. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 1916, p. 74. 



Stat. 302. io°27'.9 Lat. S., 123° 28.7 Long. E. North off" Rotti Island. Depth 216 M. 3 specimens. 



At the above-named Station three Laci)nonicc-?>'^^ó\w&\\'!, were dredged, a large one and two 

 smaller ones, that by several characters can easily be distinguished from the other Lactinonicc- 



