EEPORT ON THE ANNELIDA. 
511 
ventral hypodermic flaps is noteworthy. Each extends over a larger base than the 
longitudinal ventral muscle of its side. 
The hooks of Protula [Psygmobranchus) multicostatus and Protula ccecus of 
Claparede, and those of Protula arctica, Hansen/ so widely diverge from the foregoing 
that a different genus will probably require to be constituted. On the other hand, they 
approach those of Protula {Psijgmobranchus) protensa, as flgured by Claparede,^ though 
they are nevertheless distinct. 
Protula lusitanica, n. sp. (PI, XXXIa. flg. 16). 
Habitat. — Dredged at Station II. (ofi* the Portuguese coast, near Setubal), January 13, 
1873 ; lat. 38° 10' N., long. 9° 14' W.; depth, 470 fathoms ; surface temperature, 57°'0 ; 
sea-bottom, green mud. 
A fragment of the anterior region of a minute specimen, measuring about 5 mm. in 
total length, and scarcely 1 mm. in diameter. 
The fragment of the body is normal. The cephalic collar forms a continuous reflected 
fold ventrally, and, turning over at each side dorsally, passes backward above the bristle- 
tufts to the posterior end of the thoracic region. The branchiae are all injured, but they 
seem to have the usual structure, with a long, bare, filiform tip. Seven bristle-bearing 
processes occur on each side in the thoracic region. The bristles present the usual 
tapering tips with well-marked wings. The anterior hooks (PI. XXXIa. fig. 16) have a 
simple curve (convexity) from the crown to the inflection, and a comparatively short edge 
behind the great fang inferiorly. They difier from those of the Protula from Valentia, 
and Protula capensis, and are somewhat triangular in outline. 
The specimen was unfortunately lost, having been carried out of the dissecting- 
trough by a hair. 
Protula arafurensis, n, sp. (PI. XXXIa. figs. 17, 18). 
Habitat . — Dredged in the Arafura Sea. 
A fragmentary example, reaching 32 mm. in length and fully 2 mm. in diameter 
behind the thoracic region. 
The branchiae are absent, but the body has the usual form. The cephalic collar 
shows a broad fold ventrally, and then forms a membranous expansion over the thoracic 
setigerous processes. Two prominent papillae occur on the dorsum just behind the snout, 
for the attachment of the branchiae. Six setigerous processes occur on each side. The 
bristles (PI. XXXIa, fig, 17) are elongate, slightly curved toward the extremity, which is 
finely tapered and furnished with well-marked wings. The tips on the whole are 
' Op. cit, p. 43, Tab. vii. fi . 30. 2 Annel. Ch^top., p. 432, pi. xxx. fig. 7. 
