66 Miscellanea Zoologica. 



* Feet of two kinds, dissimilar. 



I. Aktcia. Feet raised upon the back, those of the anterior part 

 of the body composed of two very dissimilar branches, the ven- 

 tral branch having some analogy to the feet with crotchets, — ■ 

 the other feet with two branches nearly alike : Head conical : 

 Antenna?, none or rudimentary : No oral Tentacula. 



II. Leucodore. Feet papillary and setigerous, the first four pairs 

 abranchial, the fifth with crotchets ; the following like the an- 

 terior, but with a cirrus reflected on the back, and becoming 

 branchial : Head conical : Antennae two, occipital, setaceous : 

 Proboscis none. 



** Feet co-ordinate, and alike. 



III. Nerine. Head small but distinct, furnished with two long 

 occipital antennce : no oral tentacula : Feet biramous, each 

 branch consisting of a membranous lobe and a short setigerous 

 pedicle : Bronchia? forming a series of short setaceous filaments 

 along each side reflected on the back, with a small cirrus at their 

 base. 



IV. Aonia. Head small but distinct, surmounted with a conical 

 very short antenna : no oral tentacula : Feet divided into two 

 branches each garnished with a lamellar lobe : a dorsal but no 

 ventral cirrus : no branchial. 



V. Ophelia. Head indistinct, terminated by two large tentacu- 

 lar horns, surmounting a circle of oral tentacula : Feet with 

 two branches scarcely protruding, and without membranous 

 lobes : no dorsal cirrus : a ventral cirrus upon the rings of the 

 middle part of the body. 



VI. Cirratulus. Head conical indistinct, and destitute of all soft 

 appendages: Feet scarcely projecting, with two branches wide- 

 ly separate : no ventral cirrus : the dorsal cirri filiform and 

 very long : in general branchial exactly similar to the cirri and 

 fixed upon the back of one of the rings of the anterior part of 

 the body. 



II. — Leucodore, * Johnston. 

 Character — Body vermiform: head conical: mouth simple, 

 emandibulate : eyes four : antenna; 2, occipital, large, long, and seta- 

 ceous, ciliated : four anterior segments with papillous setigerous feet, 



* Name from Ast/jcoc white, and cTo>c a gift: The naturalist who has experien- 

 ced the joys of finding a hitherto unseen animal, and to whom the pleasing duty 

 has been reserved of publishing an additional illustration of the wisdom of his 



