BRITISH NEMERTEANS. AND SOME NEW BRITISH ANNELIDS. 417 



specks in front. In the second specimen the two anterior eyes were absent. 

 Segments about thirty 



^taurocephalus kefersteini, n. s. — On both the eastern and western shores of 

 North Uist a species of Prof. Grube's genus Staurocephalus* occurred under 

 stones near low-water mark. Body of an orange hue, paler towards head and 

 tail; length about an inch. Eyes two, black, situated near the posterior border 

 of the head. The latter conical, the snout forming a somewhat blunt apex. 

 Tentacles four, the anterior, arising from the infero-lateral region of the head, by 

 much the largest, and having a short jointed process at the tip ; the posterior 

 pair, springing from the outer side of each eye, are annulated and much less. 

 The large anterior pair can be coiled and twisted very prettily. The feet, instead 

 of being furnished with a dorsal and ventral cirrus, as in most of the species, 

 have only a small ovate dorsal and ventral process (Plate XVI. fig. 11, /and g) as 

 their representatives, and they are scarcely more prominent than the bristle- 

 papillae ; thus it approaches S. erucceformis, Mgrn.; from which, however, it 

 differs in the structure of the bristles and other respects. The superior fascicle 

 of bristles consists of two series, a stout bifid kind (Plate XVI. fig. 11 b) with 

 the long limb of the fork flattened and slightly clawed at the tip, the shorter trun- 

 cate and rounded. The second series (fig. 11a) are more slender, elongated, finely 

 tapered, and definitely curved, with a limited number of slight serrations on the 

 distal and convex side of the curve. The bristles of the inferior fascicle again 

 are all compound and of one kind, the terminal portion being somewhat elon- 

 gated, clawed at the tip, and without evident serrations on its edge. In regard 

 to the length of the terminal piece, these bristles present a gradational arrange- 

 ment, the longest terminal portions being superior, the shortest inferior. The 

 extreme bristles of a single foot are shown in figs, lie and 11 d; and it will be 

 observed that the swollen terminal portion of the shaft has a few serrations. The 

 tail is terminated by two styles of moderate length, which, like the processes of 

 the feet, are much shorter than in S. ciliatus. Malmgren,-}- alludes to a drawing 

 of a species of " Prionognathus," apparently different from the latter, which had 

 been sent him by A. Boeck from Norway; but he gives no description. 



yjyotocirrus scoticus, n. s. — At least three species of the Family Lumbrinereidce 

 have been hitherto described as frequenting the British shores, \\z.,Lysidice ninetta, 

 Aud. and Ed., Lumbrinereis tricolor, Mont., and L. latreillii, Aud. and Ed. The 

 two latter, however, have in all probability been sometimes confounded with the 

 L.fragilis of Muller, a species abounding on our northern and southern coasts. 

 A fourth and very well-marked form, which I have designated by the above name, 

 was dredged amongst tenacious grey clay in 6 to 9 fathoms in Lochmaddy, and 

 subsequently in several parts of the TIebridean seas by Mr Gwyn Jeffreys. The 



* Prionognathus, Keferstein, Zeitsch. fur wiss. Zool. vol. xii. p. 99, taf. viii. figs. 13-19. 

 t Annulat. Polychset. &c. 1867, p. 62. 



VOL. XXV. PART II. 5 



