382 W. C. M'mTOSH ON BRITISH ANNELIDA. 



in the shorter forms, in which it grooves the extremitj'. The ventral branch has a 

 series of rather slender bristles with tapering tips. Superiorly the latter are alternate, 

 with only a trace of the secondary process ; and it is sometimes broken off, so that the tip 

 appears simple — a condition, indeed, apparently normal in some. One of the superior 

 attenuate forms is represented in PI. LXVIII. fig. 3. The pectmate or spinous rows 

 are rather prominent. One of the best-marked shorter forms, with a somewhat worn 

 extremity, is given in PI. LXVIII. fig. 14. Toward the inferior border the bristles 

 again have attenuate tips, with a very slender secondary process ; and in some the latter 

 is absent. The ventral cirrus reaches beyond the base of the bristles, and has some- 

 what slender clavate papillas. The remarkable condition of the dorsal cirri has been 

 noticed by Prof. Lankester; once, indeed, I received from a correspondent detached 

 specimens which were supposed to be " parasites." The structure of the scales is most 

 elaborate. In Britain this species was first found by Prof. Lankester in the tubes of 

 Terebella nebulosa, and afterwards by Mr. Cooper in the tubes of Ckwtoj)terus, and by 

 myself frequently under stones at Herm. It appears to be figured by O. G. Costa in 

 Tav. 2 of his ' Aunel. di Napoli,' 1857. 



Harmothoe macleodi ', n. s. Found between tide-marks, Lochmaddy, North Uist, 

 Shetland, and in the stomach of the cod, St. Andrews. Body elongated, rather narrow, 

 and with comparatively short bristles; segments thirty-five. Head elongated from 

 before backward, and with distinct eyes similarly placed to those in H. zetlandica — two 

 at the posterior border, and two at the side in front of the middle line, all being visible 

 from the dorsum. Palpi similar, as also are the tentacle, antennee, and tentacular cirri, 

 which have clavate papillae. The scales appear to amount to fourteen or fifteen pairs, 

 are pale, semitranslucent, and with a very few short papillae along the outer and pos- 

 terior border. The scales are arranged like those in H. zetlandica, circular in front, 

 and increasing in size to the last two pairs. The dorsal cirri scarcely extend beyond the 

 bristles, are slender, tapered from base to apex, and furnished with sparsely distributed 

 clavate papillae, which leave the tip bare. The ventral cirrus has a large base and a 

 few clavate papillae. 



The bristles of the dorsal branch of the foot differ from those of //. zetlandica, since 

 their spinous rows continue to the tip of the organ. They are comparatively short, 

 moderately robust, very slightly curved, and not much tapered toward the tip. The 

 spinous rows are also very closely placed. One of the larger examples is sketched in 

 PI. LXIX. fig. 2. In the smaller forms next the body the spinous rows are somewhat 

 wider. The ventral division has boldly bifid bristles superiorly (PI. LXIX. fig. 3), the 

 whole tip being rather broad, and the spinous region short. The secondary process at 

 the tip diminishes in length from the superior to the inferior series ; thus in the latter 



' Named after Dr. Kenneth Macleod, of H.M. Indian Army, who aided me in dredging at Paible, North Uist, 

 in 1865. 



