ORDER DORS1BRANCHIA. 
27 
id. ib. 1 — 2; Aphr. Clava , Montg. Lin. Trans. IX. vii., 
which is at least greatly allied to Aphr . plana , Mull. Vers, 
xix; Polynoe imp aliens > Sav.Egg. Annel. pi. iii. f. 2 ; Polynoe 
muricata , id. ib. f. 1. 
Sigalion, Aud . and Milne Edw ., are of a much more elon- 
gated form than the other aphroditae ; they have cirrhi to all 
the feet. Sigalion Malhiedce , Aud. and Edw. Littor. de la 
France, Annel. 
TheAcOETES,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 maxillosa , 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 coeca , 
Fabr. Soc. d’Hist. Nat. de Copenh. part i. pi. iv. f. 24 — 28 ; 
N. longa , id. ib. f. 11 — 13 ; N. Aphroditoides , ib. 4 — 7 ; ib. f. 
11 — 13 ; Branchiarius quadrangulatus , 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. 
ClKETOPTERUS, Cuv.y 
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- 
13 
