ORDER DORSIBRANCHIA. 27 



id. ib. 1 — 2 ; Aphr. Clava, Montg. Lin. Trans. IX. vii., 

 which is at least greatly allied to Aphr. jjlatia, Mull. Vers. 

 xix; Polynoe impatiens, Sav.Egg. Annel. pi. iii. f. 2 ; Polynoe 

 muricata, id. ib. f. 1. 



SiGALiON, And. and Milne Edw., are of a much more elon- 

 gated form than the other aphroditae ; they have cirrhi to all 

 the feet. Sigalion MathiedcB, Aud. and Edw. Littor. de la 

 France, Annel. 



The AcoETES, of the same, have cirrhi which alternate with 

 the elytra for a considerable length ; their jaws are stronger, 

 and better denticulated, Acoetes Pleei, Aud. and Milne Edw. 

 Collect, of the Museum. The Antilles possess a large species, 

 which inhabits a tube of the consistence of leather. 



N. B. The Phyllodoce vnaxillosa, of M. Ranzani, called 

 POLYDONTE by Renieri, and Eumolpe maxima by Oken, 

 appears very much allied to Acoetes. Its proboscis and 

 jaws are the same, and neither of the genera has perhaps been 

 described from complete individuals. 



There remain still many of the Annelida too imperfectly 

 described to be well characterized : such as Nereis cceca, 

 Fabr. Soc. d'Hist. Nat. de Copenh. part i. pi. iv. f. 24 — 28 ; 

 A^, longa, id. ib. f. 11 — 13 ; N. Aphroditoides, ib. 4 — 7 ; ib. f. 

 11 — 13 ; Branchiariiis quadrangidatus, Montag. Linn. Trans. 

 xii. pi. xiv. f. 5 ; Diplotes hyalina, id. ib. f. 6 and 7 ; and the 

 pretended Hirudo branchiata, of Archib. Menzies, Lin. Trans, 

 i. pi. xvii. f. 3. Nor have I placed the Myriana, and two 

 or three other genera of M. Savigny, for want of an opportu- 

 nity of re-examining them. 



Chcetopterus, Cuv., 



A new and singular genus that can only come here ; the 

 mouth without jaws, and proboscis furnished above with a lip, 

 to which are attached two very small tentacula. Then comes 

 a disk, with nine pairs of feet ; then a pair of long silky bun- 



1.T 

 O 



