138 ANNELIDES. ANTENNA. 



FAMILY HI. NEREIDES. 



Branchiae, when distinct, and superior cirri, on all the pairs of 

 the pediform papillae ; two jaws, or none. 



Gen. 8. SPIO, Lam. 



Body elongated, slender, with a row of tufts of very short bris- 

 tles ; branchiae lateral, not divided, filiform ; two very long 

 filiform or setaceous tentacula ; mouth terminal ; two or four 

 eyes. 



S. seticornis, Lam. (Nereis, Lin.) Tentacula finely striated. In- 

 habits European seas Lam. v. 319. 



S. quadricornis, Lam. (Diplotis hyalina, Mont.) Four tentacula, 

 the external filiform and longest, the intermediate thick and short. 

 Inhabits coasts of England. Lin. Trans, xi. pi. 14, fig. 6, 7- 



Gen. 9. SYLLIS, Lam. 



Proboscis divided into two segments, with the orifice destitute 

 of tentacula, but with a small projecting horn ; no jaws ; three 

 moniliform antennae ; two pairs of tentacula and moniliform 

 cirri ; the other cirri with the upper ones moniliform and 

 long, and the lower inarticulated and conical. 



S. monilaris, Sav. Body very long, slightly depressed, narrowed 

 gradually to the tail, which terminates in two slender and moni- 

 liform filaments. Inhabits Red Sea. Lam. v. 318. 



Gen. 10. PHTLLODOCE, Lam. 



Proboscis thick, claviform, with a row of small tentacula at its 

 orifice ; no jaws ; antennae short, and no odd one ; eight pairs 

 of tentacular, subulate, and unequal cirri, the others compres- 

 sed, veined, and not retractile. 



P. laminosa, Sav. Body very long, almost cylindrical, brown, with 

 purple and violet reflections. Coasts of Italy Lam. v. 317- 



Gen 11. HESIONE, Lam. 



Proboscis thick, subconical, of two segments, with the orifice cir- 

 cular and destitute of tentacula; no jaws; antennae equal; 

 eight pairs of tentacular cirri, all long, filiform, and retractile. 



H.festiva, Sav. Proboscis conical ; papillae naked at the apex, and 

 subtruncated ; body silvery gray. Inhabits coasts of Italy 

 Lam. v. 316. 



Gen. 1#. GLYCERA, Lam. 



Proboscis long, cylindrical, subclaviform, without tentacula at 

 the orifice; no jaws; middle and exterior antennas very 

 small, diverging, two-jointed ; no tentacular cirri. 



G. unicornis, Lam. Head in the form of a pointed cone ; body cy- 

 lindrical, linear, slightly inflated towards the anterior part, with 

 numerous segments ; pale bronze-coloured Lam. v. 315. 



