EEPORT ON THE ANNELIDA. 
331 
The dental apparatus (Fig. 84) is peculiar in the great proportional length of the 
posterior appendages, the region occupied by the latter being only a little shorter than 
the maxillae. In this respect, therefore, the apparatus diverges from that in Nothria 
ehlersi. The colour is also pale, a blackish pigment-line occurring between the maxillae 
and the appendages, and a dark band forming a border to. 
the latter on each side posteriorly. The various parts are 
also comparatively soft, and therefore less brittle ; but this 
feature is perhaps of slight moment until the correct physio- 
logy of the parts is made out. The proportions of the 
maxiUae are similar to those of Nothria ehlersi. The anterior 
fang is finely pointed (from freshness X) and much curved. 
The posterior appendages have a well-marked cylindrical 
region next the maxillae, and an expanded and smoothly 
rounded, lamellar region, with a deep median notch distally 
(posteriorly). The left great dental plate has ten teeth, 
counting the inferior prominence, the right ten. The left 
lateral paired plate shows six or seven, the unpaired nine. 
The right lateral presents about seven. The mandibles are as 
soft as the other parts of the apparatus, the incisive edge being 
bulbous, and the semicircle on the ventral surface forming 
a soft apron from one side to the other. The transverse 
line running outward into the projecting edge at each side 
is as distinct as in the densest specimen ; and the two dorsal 
pigment-bands on each side of the symphysis are boldly defined. 
The first region of the body, like that in Nothria ehlersi, consists of three segments. 
These closely approach the latter in form, though certain minor differences are apparent. 
The jointed bristles have the distal process less acute and more bulbous than in the 
former species, and the secondary or inferior process is smaller (PL XXVIa. fig. 8). It 
is remarkable to notice how closely these forms approach each other, and yet how per- 
vading the distinctions are. 
After the fourth foot the ventral cirrus forms a scute. In comparing the anterior 
feet of this and the former species [Nothria ehlersi) it is found that the dorsal cirrus in 
this is much less dilated at the base, and therefore less broadly lanceolate, while its inner 
or dorsal margin is somewhat crenate. 
A branchia appears on the sixteenth foot (on one side) as a bifid process of consider- 
able length. At the twentieth foot the bifid branchiae are about twice the length of the 
dorsal cirrus, which, as in the former species, is appended to the common base. The 
branchiae are decidedly longer than in Nothria ehlersi, in which they are only about a 
third longer than the dorsal cirri. At the thirtieth foot the branchia has only two 
Pig. 84. — Maxill® and dental plates of 
Nothria arrtmndi, n. sp., from the 
dorsal aspect ; x 24 diameters. 
