112 APHRODITACE^. 



of L. clava are so, and never so thickly. In the structure of the 

 feet and bristles, the two species are alike. There are twenty-five 

 pairs of feet. The dorsal branch is short, with a comparatively 

 small tuft of short bristles, gently curved and tapered to a rather 

 blunt point, where the shaft is closely striated across. The ventral 

 branch is much larger, obtusely pointed, with a flattened brush of 

 strong yellow burnished bristles ; the shaft smooth and cylindrical, 

 bent towards the point, below which there is a thickened portion 

 armed with sharp denticulations in close-set transverse series. (See 

 figs. 5 & 6.) 



(a) South Devon coast, G. Montagu, Esq. 



(b) Falmouth, TF. C. Cocks, Esq. 



** Scales more than 12 pairs, deciduous. Vivacious. 



3. L. impar, scales thirteen pairs, roundish or reniform, imbricate, 



granulous, ciliated on the external margin ; antenna, tentacula and 



cirri tomentose, with fleshy papillae ; anal extremity narrower, with 



prolonged styles. Length 8'". Plate VIII. fig. 3-9. 



Polynoe impar, Johnston in Ann. Nat. Hist. ii. 436. pi. 22. f. 3-9. 

 Oersted, Annul. Dan. Consp. 13. Grube, Fam. Annel. 36. 



Hab. Between tide-marks. 



Besc. Body linear-oblong, narrowing insensibly from the head to 

 the tail, depressed, slightly convex on the back, of a freckled or 

 mottled brownish colour. Head concealed by the foremost scales, 

 square, sinuated in front, pale. Eyes very distinct, the posterior 

 pair most approximated. Proboscis with four rather large, corneous, 

 hooked maxillae, the orifice encircled with a single series of simple 

 filaments. iVntennse five, the central one setaceous, elongate, flesh- 

 coloured ; the middle pair very small ; the outer pair as long and 

 rather thicker than the odd one, but pale-coloured, — all of them 

 appearing roughish when highly magnified. Scales thirteen pairs, 

 covering the back entirely, some of them roundish, others subqua- 

 drangular, and others kidney-shaped, rough with miliary granules 

 excepting where overlapped, and the external margin fringed with 

 short cilia. Feet uniramous, armed with two fascicles of very stout 

 bristles, the superior with the most numerous and longest bristles. 

 Bristles all of them simple, the longest formed like a lance, the 

 shorter curved like a scimitar towards their point, which is concave 

 ^nd serrulate along the edges : a single spine to each brush of bristles. 

 Tentacular cirri alternating as usual, covered with short fleshy 

 papillae ; the point of the cirrus suddenly acuminate, naked, and 

 frequently spathulate. Tail with two of the filaments disproportion- 

 ably elongated. 



{a) CuUercoats, Northumberland, Joshua Alder, Esq. 



Plate VIII. Fig. 3. Lepidonotus impar, nai. size. 4. The head uncovered 

 and magnified. 5, 5*, 6. Scales magnified. 7, 8. Two views of two 

 feet, magnified ; b, the tentacular cirrus. 9. Three bristles. 



