REPOET ON THE ANNELIDA. 
37 
part enveloped by tbe felt, and they constitute a kind of double row along the dorsum. 
The shafts of these are somewhat ovoid in transverse section in the middle, and more 
Hattened towards the tip. Their texture is brittle, and they have the usual lustrous brown 
appearance. Below the dorsal spines is a tuft of very long, simple, flexible bristles, 
generally coated from base to apex with fine mud. They are most conspicuous posteriorly, 
forming a dense mass on each side superiorly. 
The envelopment of the dorsal spines by the felt causes the upper ventral bristles to 
appear very prominent. They resemble stiff brown spines with a slightly pilose tij?, 
which is frequently broken. The inferior group (a short distance outside the cirrus) are 
much more slender, but conform to the same type, their distal regions remaining more 
perfect from their sheltered position (PL YIa. fig. 3 — one of tlm inferior or smaller group, 
it may be wdth the tip in process of reproduction). Anteriorly, as in allied forms, the 
tips of the bristles are in many cases quite smooth. The internal portion of the bristle 
is also less brittle than the exterior, the former remaining as a long appendage after 
fracture of the latter. 
The dorsal cirrus is long and tapering, and ends in a slightly enlarged tip. Its surface, 
with the exception of a microscopic q»^^lpocil or minute papilla or two, appears to be 
smooth. The ventral cirrus is subnlate, tapering from base to apex, and with more 
numerous papillae. The tip appears also to be slightly bulbous, but it must be recollected 
that spirit greatly alters these delicate structures. 
The scales as usual are fifteen pairs, and both dorsal and ventral surfaces are coated 
with a ferruginous deposit. A few microscopic papillae occur on the upper surface. 
Some fragments of long hair-like greenish confervae were attached to the felt on the 
dorsum of one specimen. 
The proboscis {'pharynx exsertilis of Kinberg) and alimentary canal conform to the 
typical structure. The former is much compressed laterally. The body-wall appears to 
agree in structure with Aphi'odita aculeata, except that the dorsal cuticular papillae are 
somewhat longer and have simple pointed tips, whereas in Ayylirodita aculeata they have 
a slight terminal button or dilatation. The nerve-cords occupy the middle of the same 
wide area between the oblique muscles inferiorly. 
In one specimen the intestinal canal contained much granular debris, forming a 
pulpy mass, in which shreds of cuticle and numerous bristles apparently of one of the 
Spionidae occurred. 
This difiers both from the Aphrodita alta and the Aphrodita longicornis of Kinberg, 
the former coming from the South Atlantic near Rio Janeiro, and the latter from the 
same ocean off the River Plate. From the first it is distinguished by the prominent 
spines of the dorsum (they are hidden under the felt in Kinberg’s form), the absence of 
the elevated ocular region on each side, and the shape of the tentacle, which has a shorter 
and wider distal region in Aphrodita cdta ; whilst from Aphrodita longicornis it diverges 
