REPORT ON THE ANNELIDA. 
303 
same collection (British Mnseum), a simple and moderately elongated branchial process 
is developed in the posterior region of the body. 
Macduffia honhardi} n. sp. (PL XXXIX. figs. 20-22 ; PI. XXa. fig. 26). 
Habitat . — Dredged off Sombrero and St. Thomas, in 470 and 390 fathoms. 
A fragment of the anterior end of a peculiar form, measuring about 9 mm. in 
length, and little more than 1 mm. in breadth. 
The head (PI. XXXIX. fig. 20) is distinguished from any of the branchiferous series 
formerly described by having a smoothly rounded and entire margin, like a blunt cone, 
and without trace of palpi or division. It bears four smooth tentacles, a long one at 
each side, just within the eye, and a shorter proceeding almost from the margin of the 
snout a little beneath. A single and comparatively large eye occurs on each side. A 
considerable space devoid of processes exists in the middle line of the snout. On the 
ventral surface, the outline of the region resembles a horse-hoof, and has a groove in 
the centre, joining the transverse furrow at the mouth. 
The dental apparatus (Fig. 60) presents a pair of maxillae, which are somewhat nar- 
rowed in front. The posterior spathulate processes are unfortunately imperfect. The 
left great dental plate has six teeth, the right seven. The teeth on the right lateral paired 
plate seem to be about six or seven, and the unpaired appear to have about the same 
number. Those on the right lateral exceed the latter. 
The mandibles have a dentary surface shaped ventrally like 
a bivalve shell, and with a stripe of brown pigment 
arranged symmetrically on each side of the symphysis. 
Their condition is too imperfect for delineation. 
The first buccal segment (for there are two) consider- 
ably exceeds the second in breadth, especially inferiorly. 
The succeeding five segments bear a dorsal cirrus, which 
is tapered from base to apex, and somewhat short and 
thick ; a well-marked setigerous region ; and a large thick, 
tongue-shaped ventral cirrus. The sixth, seventh, eighth, 
and ninth feet are alone branchiferous. The sixth has 
T I-I T-- •• r 60 .— Maxill® and dental plates of 
a brancmai process ol three divisions springing Irom a Macduffia honhardi, n. sp. ; x 54 dia- 
• n • 1 1 1 e 00 meters. 
common trunk united with the base of the dorsal cirrus. 
The seventh has three or four divisions, and the eighth and ninth four each. 
The tenth foot (PL XXXIX. fig. 21) presents a somewhat short dorsal cirrus of the 
ordinary shape, an irregularly conical, setigerous region, and a large, lobate, inferior 
^ Named in remembrance of the late Alex. Macduff, Esq., of Bonhard. 
