ANNULATA. 239 



the dorsal surface is taken for the ventral, the anterior part for the 

 posterior; the author, Ann. des Sc. not. sec. se'r. vn. Zoologie, p. 247, 

 counts it amongst the Nereids. 



Aonis SAV. 



Comp. AUD. and Edw. Ann. des Sc. not. Tom. xxvu. pp. 400 403, 

 PL xvin. figs. 9 13. 



Aricia SAV. Body elongate, attenuated at both ends, with 

 conical head. The ventral oar of the anterior feet with a transverse 

 incised crest, of the posterior with a conical setiferous tubercle and 

 small cirrus, with soft branchial appendage. Dorsal cirri triangular, 

 plane. 



Sp. Aricia Cuvierii AUD. and EDW. Ann. des Sc. not. xxix. p. 397, xxvir. 

 PL 15, f. 5 13, &c. 



Scoloplos BLAINV. 



Comp. OERSTED Gronl. Annul, dorsibr. p. 199. Here also seems to 

 belong the genus Travisia JOHNSTON, Ann. of Nat. Hist. iv. p. 373, PI. XT. 

 f. n 18. 



Spio O. FABR. Head with two very long antenniform tentacles. 

 Mouth inferior or subterminal, little exsertile and without jaws. 

 Body elongate, slender. Superior pinna with uncinate or capillary 

 setas, inferior with capillary setae; branchiae ligulate, dorsal, in the 

 anterior part of the body very large, in the posterior evanescent. 



Sp. Spio seticornis 0. FABR., BASTER Nat. Uitsp. n. pp. 149, 150, Tab. xn. 

 fig. 2. 



0. FABRICIUS, von dem Spio-Geschlecht, Scriften der Berliner Gesellsch. 

 naturf. Freunde vi. p. 256. KATHKE, Beitr. zur Fauna der Krym, Tab. 

 vin. figs, i 6, p. 421 (Spio Icemcornis), OERSTED Grcenl. Annul, pp. 

 202, 203. 



The genus Malacoceros QUATREFAGES is distinguished by the defect of 

 eyes, GUERIN, Magas. de Zool. 1843. 



Family XI. Nereides. Body elongate, slender, with head 

 distinct, supplied with tentacles (antennae) and eyes. Rudiments 

 of feet similar throughout the whole body. Branchiae not distinct 

 from the feet or small appendages of the feet, like lobes or tu- 

 bercles. Proboscis large, often armed with two horny jaws. 



Goniada AUD. and EDW. Head conical ; with pinnae of segments 

 remote, each of them supplied with an acus and setae with conical 

 lobes or cirri. Proboscis large, furnished beneath with a double row 



