ANNULATA. 239 
the dorsal surface is taken for the ventral, the anterior part for the 
posterior; the author, Ann. des Sc. nat. sec. sér. VII. Zoologie, p. 247, 
counts it amongst the Nereids. 
Aonis SAY. 
Comp. Aup. and Edw. Ann. des Sc. nat, Tom. XXvIl. pp. 400—403, 
P), xvii. figs. g—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 Cuvierti AuD. and Epw. Ann. des Sc. nat. XXIX. p. 397, XXVII. 
Pl. 15, f. 5—13, &e. 
Scoloplos BLAINY. 
Comp. OERSTED Grénl. Annul. dorsibr. p. 199. Here also seems to 
beloff® the genus Zravisia Jounston, Ann. of Nat. Hist. wv. p. 373, Fl. x1. 
f. 11—18. 
Spio O. FAsr. 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 
setee, inferior with capillary sete; branchiz ligulate, dorsal, in the 
anterior part of the body very large, in the posterior evanescent. 
Sp. Spio seticornis O. Fasr., BasteR Nat. UVitsp. 1. pp. 149, 150, Tab, x. 
fig. 2. 
O. Fasricius, von dem Spio-Geschlecht, Scriften der Berliner Gesellsch. 
naturf. Freunde Vi. p. 256. RatuKe, Beitr. zur Fauna der Krym, Tab. 
vu. figs. 1—6, p. 421 (Spto levicornis), OERSTED Grenl. Annul. pp. 
202, 203. 
The genus Malacoceros QUATREFAGES is distinguished by the defect of 
eyes, GumRIN, Magas. de Zool. 1843. 
Family XI. Nereide. Body elongate, slender, with head 
distinct, supplied with tentacles (antennz) and eyes. Rudiments 
of feet similar throughout the whole body. Branchiz 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 Aup. and Epw. Head conical; with pinne of segments 
remote, each of them supplied with an acus and setz with conical 
lobes or cirri. Proboscis large, furnished beneath with a double row 
