396 W. C. M'INTOSH ON THE ANNELIDA 



The body is somewhat elongated for a typical example of the group. Most of the 

 specimens retain traces of colour, the dorsal cirrus being brownish purple ; and some 

 have a brownish median line on the dorsum, and a band of the same hue at the anterior 

 part of each segment. The dorsal edge of the caruncle is likewise deep purplish. 



The caruncle extends to the posterior border of the fourth segment. The tentacle is 

 much longer than the antennse; and the latter, again, are longer than the buccal 

 processes (tentacles of M. de Quatrefages). The branchiae are bipinnate, commence at 

 the 4th body-segment, and terminate on the last. The tail has two blunt styles. 



The dorsal fascicle springs to the exterior of the branchiae in each foot, and consists of 

 a brittle series of radiating bristles (PI. LXXI. fig. 2) with serrated tips. The dorsal 

 cirrus takes its origin from the same papilla. The ventral division is furnished with a 

 fan-shaped tuft of bristles, which are more slender and elongated in the centre of the 

 bundle. The bifid tips of the bristles diminish from above downward. The upper 

 series (PI. LXXI. fig. 3) have a large process beyond the fork, while the lower (fig. 4) 

 have a shorter. The ventral cirrus is pale in the preparations, and comes from the 

 posterior and inferior edge of the bristle-papilla. It is about the same length as the 

 dorsal ; and both continue to the last segment. Air readily passes into the central cavity 

 of the dorsal bristles ; and, in common with the others, they have a minutely granular 

 appearance under the microscope. Acetic acid demonstrates a considerable amount of 

 calcareous matter in their composition, a flexible translucent chitine remaining, while 

 the dorsal bristles lose their serrations. Some of the bristles show fine transverse 

 lines, -which even notch the edge — a feature more conspicuous after the addition of 

 the acid. 



APHEODITID^. 



The representatives of the Aphroditidse are three, viz. : — Aphrodita aculeata, L., 

 young examples of which occurred in 690 and 257 fathoms on Stations Nos. 3 & 8 on the 

 Channel slope in 1870, and in 90 fathoms off the west coast of Ireland in 1869 ; Lcetmonice 

 filicornis, Kbg., ofi"Eockall in 164 fathoms, and in 358 fathoms on the Channel slope; 

 and Hermione hystrix, Sav., in 40-80 fathoms ofi" Algiers in 1870. 



POLYNOID^. 



Lejndonotus sqiiamatus, L., was dredged in 30-40 fathoms on stony and muddy 

 ground off Dingle Bay, Ireland, in 1869, and Eunoa nodosa, Sars, in 690 fathoms on 

 the Channel slope in 1870. 



Eunoa hispanica, n. s. Dredged in 539 fathoms in the Atlantic (Channel slope) 

 1870. The single specimen is fragmentary and without scales. There is a pale purplish 

 hue along the dorsal and ventral surfaces. The eyes are remarkably large ; indeed the 

 pairs almost touch each other; and, from the whitish centre in the spirit-preparation, 

 each appears to have a lens — a feature, however, probably due to the opacity of the trans- 

 lucent covering. The palpi are smooth. The inferior cirrus is long, slender, and smooth. 



