REPORT ON THE ANNELIDA. 
serrated kind. M. Claparkle^ has drawn attention to the special characters of the bristles 
in JEuphrosyne, viz., their extreme brittleness, their tubular structure, calcareous nature, 
and the entrance of air into the interior. The same features have been noticed in Chloeia.^ 
Schmarda also mentions the occurrence of a yellow fluid in the central canal of the present 
form. Nothing has been seen to verify his statement that a network of slightly 
curved bristles, pointed at both ends (fusiform-acerate, Bowerbank), exists at the lower 
border of the branchiaj. His figures very much resemble sponge-spicules. The ventral 
bristles (PL Ia. fig. 3) are considerably larger than the dorsal, and are terminated by a 
shghtly curved blunt tip, with a conical spike at the base. The internal canals from the 
processes join after a short course downward, and there is a slight dilatation of the cavity 
opposite the enlargement at the upper third of the shaft.® 
The dorsal region of each segment is further supplied with a densely ramose series of 
branchial processes, which are eleven in number in the typical segments. Schmarda 
says there are twelve, but such a discrepancy is of little importance. Each is dicho- 
tomously branched, and the tips end in a series of elliptical or sub-oval bodies somewhat 
like those in Euphrosyne foliosa. The superior are the longer. So far asTan be observed 
in sections of the organs, the view of M. Claparede — that these structures are entirely 
devoid of an axial cavity, if we exclude from this term the blood-vessels — seems to be 
correct, especially as regards the distal branches. This author, indeed, thought that the 
general surface of the body exercised the function of respiration. On the other hand, it 
requires very little manipulation to trace the large blood-vessels from the body-cavity 
into the branchise and follow their branches up to (but not into) the tips of the organs. 
In sections of the base of the trunks a complex series of muscular fibres appear, and the 
cuticle and hypoderm of the entire structure are dense except distally, where the former 
becomes very thin. 
In the structure of the body-wall this form agrees with its congeners. The nerve- 
cords have superiorly a firm investment which is continuous from side to side. In the 
hollow between them superiorly is a fascicle of muscular fibres, and below them a central 
granular structure. Moveover, the cords are united by a streaked isthmus interiorly. The 
anatomy of one region of this form is especially interesting, viz., that of the buccal 
apparatus. The anterior part of the structure consists of a cylindrical protrusible proboscis 
densely covered with cuticle. The centre of the latter in front is occupied by a large 
muscular and vascular, but chiefly glandular mass, the inner lining of which is throvm 
into bold longitudinal rugae. The vast collection of glands in this organ would indicate 
1 Anu. Chetop. clu Golfe de Naples, p. 109. 
^ “ Porcupine ” Annelids, Trans. Zool. Soc. Lond., vol. ix. p. 396. 
® A remarkable and apparently new form in the British Museum shows the peculiarity of having along with the 
ordinary forked ventral bristles a dense series of long slender dotted hairs tapering to a tip which is slightly birlbous. 
The dorsal serrated forms are very boldly marked, and the smooth ones are long. The branchise are much branched, and 
the tips somewhat lanceolate. The species is fully an inch in length, and comes fioin the Pascadores Islands — Consul 
Swinhoe’s Collection (70, 6, 18, 13). 
