REPORT ON THE ANNELIDA. 
147 
The head (PL XXIII. fig. 3) forms a small rounded eminence at the base of the 
tentacle, and is somewhat concealed by the nuchal fold. No trace of eyes is visible in 
either specimen. The tentacle is a simple filiform process, which arises from an enlarged 
base and tapers gently to the extremity. The first pair of feet had lost the dorsal 
(tentacular) cirri, and the ventral only reached the base of the bristles. The latter are 
much more boldly spinous than the succeeding dorsal series. The palpi are long and 
finely tapered. 
The first pair of scales project far forward like a prow, and instead of being 
smaller than their successors, as in the ordinary Sagalionidse, they are conspicuously 
larger. AH the scales (PI. XXVII. fig. 6) are coated externally by Foraminifera, and 
fimbriated round the border. The cilia are long and slightly tapered toward the tip. 
The feet are covered with numerous short papillae, and the ventral cirrus is of 
moderate length, reaching almost to the tip of the setigerous lobe. Numerous long 
papillae occur between the feet. The dorsal division bears a series of very fine 
bristles, with faintly marked spikes at the tip. Nothing so definite as Kinberg’s ^ 
figure of the spikes in Psammolyce petey'si could be observed, but perhaps these delicate 
processes may have been affected by their calcareous surroundings. 
The ventral branch has stoutish flattened bristles (PL XIIIa. fig. 14, from the middle 
of the series) with brownish shafts and a single bifid joint at the tip. The latter 
becomes much more elongated superiorly amd interiorly (PL XIIIa. fig. 15). The distal 
end of the shaft is smooth. 
This appears to differ both from the Psammolyce arenosa,^ Delle Chiaje, which is pro- 
bably the Psammolyce herminice of Aud. and Ed.,^ and Psammolyce albicans^ of De 
Quatrefages, by the shape of the first pair of scales and the structure of the ventral 
bristles. At least no mention is made of their peculiarities. M. de Quatrefages now 
places the Leanira quatrefagesi of Kinberg under the same genus, to which it certainly 
does not belong. 
From the Psammolyce rigida of Glrube, from the Eed Sea, it is distinguished by the 
eyes which are at the corner of a quadrangle. It seems to be closely allied to his 
Psammolyce umbonifera from the Atlantic,® but as he does not describe the bristles 
minutely it is difficult to determine. 
Psammolyce differs from Thcdenessa and Sigalion in the structure of the body- 
waU, since the surface of the somewhat thin cuticle is studded with papiHse which are 
often coated with and joined together by extraneous deposits. The hypoderm is thin. 
The dorsal longitudinal muscles show no appreciable fold externally, and meet in the 
middle line dorsally. The ventral longitudinal muscles are reniform in transverse section 
(being rounded interiorly, dimpled superiorly). The fasciculi both of these and of the 
1 Freg. Eugen. Resa, Taf. ix. fig. 43, Gs. ^ Descriz. e not., t. v. pp. 58 and 107, Tav. 98, figs. 4, 5, &c. 
^ Annelides, p. 107, pi. 1a. figs. 1-6. ^ Anneles, p. 282. “ “ Gazelle,” p. 521. 
