246 
THE VOYAGE OF H.M.S. CHALLENGER. 
posterior, but some of the latter differences may be due to indifferent figures. The maxillae 
and dental plates nearly correspond, and it has been thought advisable to unite the forms. 
Marenzeller’s example was procured on the east coast of the island of Ino-Sima, Japan. 
Lumbriconereis kerguelensis, G-rube (PL XXXVI. figs. 16, 17 ; PL XVIIa. fig. 18 ; 
PL XVIIIa. figs. 2-4). 
Lumbriconereis kerguelensis, Grube, Jahres-Bericht. der ScLles. GeseUsch. f. vat. Cultur., 1878, 
p. 92. 
Habitat. — Dredged at Station 149g (off London River, Kerguelen), January 29, 
1874; lat. 48° 50' S., long. 69° 18' E.; depth, 110 fathoms; surface temperature 40°'2 ; 
sea-bottom, volcanic mud. 
A comparatively small form, the longest fragment measuring about 40 mm., with a 
breadth anteriorly of about 2*5 mm. In the general outline of the body it agrees with 
Lumbriconereis nardonis, Gfrube, from the Adriatic, that is, has a more obtuse head and 
more distinctly marked segments than Lumbriconereis fragilis. 
The head (PL XXXVI. fig. 16) forms a large, bluntly conical and smooth process, 
marked dorsally by a little brownish pigment ; while ventrally a depression or dimple 
occurs in the centre. The mouth has the ordinary lateral folds on each side, in front of 
the crenate oral margin. Compared with the common southern form [Lumbyiconereis 
nardonis), the head is smoother and more 
rounded anteriorly, and the lines running from 
the border of the snout are wider. 
The maxillse (Fig. 12) are brownish, and the 
posterior spathulate processes taper to a some- 
what fine point. Each great dental plate has 
four teeth, the last on the right being followed 
by an elevation of the dental edge. Two lateral 
plates exist in front, each terminating in a 
tooth externally (dorsally). That adjoining 
the great dental plate is somewhat triangular, 
while the outer plate widens from the tooth to 
an expanded or lobate end. A small brownish 
patch exists outside the tooth of the latter 
plate ; and a slightly curved band stretches 
backward to the side of the maxilla. When 
the apparatus is viewed from the ventral surface, three horny inferior lobes project, viz., 
the two lateral plates, and the usual rounded process from the great dental plate. The 
mandibles (Fig. 13) ventrally present a crescentic dentary surface, somewhat pointed 
Fig. 12. — Maxills and dental plates of Lvmibriconereis 
kerguelensis ; x 55 diameters. 
Pig. 13. — Mandibles of Lumbriconereis kerguelensis, from 
the ventral surface ; x 55 diameters. 
