204 ARICIAD.^. 



3. Sp. crenaticomis, central lobe of the head deeply bilobed; the 

 branchial cirri about equal on all the segments ; eyes with the pos- 

 terior pair widest apart ; antennae tapered a little towards the tips ; 

 segments about sixty. Length 6'". 



Spio crenaticomis, Montac/u in Linn. Trans, xi. 199. tab. 14. f. 6. 



Grube, Fam. Annel. (iQ. 

 Spio quacli-icornis, ham. Anim, s. Vert, v. ; and 2ncle edit. v. 559. 



Stark, Elem. ii. 138. 



Hab. The coralline region. 



Desc. " Body slender, much resembling that of a Nereis, tapering a 

 little, and furnished with about sixty joints, terminating posteriorly 

 with two short styles ; the joints are furnished with peduncles and 

 fasciculi ; upon the upper part of the former are long cirri standing 

 erect, with their points usually reflecting over the back, and nearly 

 meeting those on the opposite side. The two tentacula are not quite 

 filiform, but taper a little, and are articulated or furnished with 

 numerous joints, which gives them a crenated appearance ; their 

 length is nearly half as long as the body : between the tentacula, but 

 generally obscured by them, are four black eyes placed in pairs : on 

 the front of the head is a short bifid snout, connected at the base." 

 " The colour is pale, with pink cirri." " The tube or case in which 

 these animals reside is extremely tender, composed of minute adven- 

 titious matter slightly agglutinated together : it is usually attached 

 to Sertularia." — Montagu. 



25. LEUCODORE*. 



Leucodore, Johnston in Mag. Zool. S)- Bat. ii. 66. Grube, Fam. 



Annel. 67. 

 Leucodorum, Oersted, Annul. Dan. Consp. 38. 



Char. Body vermiform : head conical, with two long occipital 

 antennse : first four segments with papillose setigerous feet, the fifth 

 with spinets and apodous, the following with papillose feet like the 

 anterior, and furnished besides with a branchial cirrus reflected on 

 the back : anal segment campanulate, the vent opening in its concave 

 centre. Tubicolous. 



* Name from XevKos, white, and Sws, a gift (and not Sopd, the skin, as Agassiz 

 gives it). Tlie naturalist who has experienced the joys of finding a hitherto un- 

 seen animal, and to whom the pleasing duty has heen reserved of publishing an 

 additional illustration of the wisdom of his Creator, and of filling up a blank in our 

 knowledge of His works, will at once divine the origin of this name so strangely 

 applied to a worm : 



" Nomen habes niveis nunc inscriptum ergo lapillis." 



The scholar may remember that the name was originally formed by some classical 

 wit for Dr. Whitgift, the famous Archbishop of Canterbury, temp. reg. Elizab. 

 See Walton's Lives by Zouch, p. 209. York, 1807. 



