REPORT ON THE ANNELIDA. 
237 
The posterior bristles (PI XVIII a. fig. 15) are tinged of a deeper brownish hue 
than in Notocirrus tricolor. 
The tail is somewhat imperfect, but it seems to have been terminated by two large 
dorsal and two smaller ventral processes. 
The cuticle is comparatively thick, and the hypoderm and circular muscular coat 
well developed. In the structure of the body-wall this form shows somewhat smaller 
ventral longitudinal muscles than in Notocirrus tricolor, Johnston, while the oblique 
muscles are strongly marked, part of the fibres apparently terminating inferiorly opposite 
the superior angles of the nerve-cord, the rest passing down to decussate in the middle line 
ventrally, the fibres probably running into the circular coat. The strong vertical fibres 
pass from the upper angles of the nerve-area to the wall of the alimentary canal, enclos- 
ing the ventral blood-vessel in the intermediate space. The binding of the nerve-trunk at 
intervals, by the muscular fibres just mentioned, is noteworthy. The dorsal longitudinal 
muscles are proportionally as powerful as in Notocirrus tricolor. The muscularity of the 
walls of the dorsal and ventral blood-vessels is conspicuous. The great size of the various 
muscles of the body-wall in these forms probably causes rigid contraction, so that the 
alimentary canal occupies a small area in the preparations. The inner margin of the 
canal is opaque in section, thus forming a definite boundary to the more lax and trans- 
lucent glandular tissue intervening between the former and the muscular layer. A 
peculiar dark streak occurs in sections of the nerve-cord superiorly, but no distinct canal 
is apparent. 
Schmarda^ originally described Notocirrus as possessing both jointed and simple 
bristles, but the more systematic grouping of Kinberg^ and Ehlers® is preferable. Grube^ 
takes as the type the Notocirrus chilensis of Schmarda, which possesses a dental 
apparatus wholly different from the foregoing, but it is doubtful if this arrangement 
obviates the difficulties which are entailed on students of the group by Schmarda’s 
confused classification. 
Laranda, Kinberg. 
Laranda longa, (Webster) (PI. XXX. fig. 10 ; PI. XXXVII. fig. 5). 
Drilonereis longa, Webster, Ann41. Cb4top. Virginian Coast, Trans. Albany Inst., vol. ix. p. 40. 
Habitat . — Dredged at Station 47 (off the American coast between Halifax and New 
York), May 7, 1873; lat. 41° 14' N., long. 65° 45' W. ; depth, 1340 fathoms; surface 
temperature, 42°'0; sea-bottom, blue mud. 
A slender species, about 42 mm. in length and a little more than 1 mm. in diameter. 
1 Neue wirbell. Thiere, I. ii. p. 115. ^ Ofversigt k. Vetensk.-Akad. Forhandl., 1865, p. 573, &c. 
® Op. cit, Ed. ii. p. 397. ^ Jalires-Bericht. der Schlef. Gesellsch.f. vat. Cultvr., 1878, p. 81. 
