NEPHTHYACE^. 167 



Plate XV. Fig. 3 a. The head of Heteronereis margaritacea, with the 

 proboscis protruded. 3 b. A jaw separated and magnified. 3 c. The 

 foot of the 12th ring. 3d. A foot from near the middle of the body, 

 viewed laterally. 



Fam. V. NEPHTHYACEiE. 



Nephthydea, Grube, Fam. Annel. 52. 

 Char. Body vermiform, tapered posteriorly, the anal segment 

 with a single style : head small, angled, flattish, truncate in front, 

 and furnished with four minute antennae : mouth with a large clavate 

 biarticulated proboscis, ciliated with two series of connivent papillae 

 at the longitudinally slit orifice, and with rows of similar sharp 

 papillae half-way down the posterior half: jaws two, small: no ten- 

 tacular cirri : segments numerous, narrow, all of them footed : feet 

 large, biramous, the branches wide apart, lobe-like, vAth. a foliaceous 

 lamina in front of each, and pendent underneath the superior a sickle- 

 shaped branchial process ; the inferior with a short cirrus at its base : 

 bristles from the foot-branches behind the lamellae, in spread fasci- 

 cles, slender, weak and setaceous, simple and compound, the latter 

 spliced at its junction with the shaft, and with the terminal piece 

 acicular : a spine to each fascicle. Margaritaceous : arenicolous. 



14. NEPHTHYS. 



Nephthys, Cuv. Regn. Anim. 203. Lam. Anim. s. Vert. v. 313. Savign. 

 Syst. Annel. 34. Aud. Sf M.-Edw. Litt. de la France, ii. 232. 

 Blainville in Diet, des Sc. nat. Ivii. 483. Johnston in Loud. Mag. 

 Nat. Hist. viii. 341. Williams in Rep. Brit. Assoc. 1851, 215, and 

 in Ann. Sf Mag. Nat. Hist. ser. 2. xii. 404. 



Char. The only genus of its family. 



1 . N. caeca, dorsal lamella suboval, twice as large as its setigerous 

 lobe ; inferior lamella larger than the dorsal, broadly ovate or heart- 

 shaped, with a small cirrus at its base ; bristles weak, rather loosely 

 fasciculate, and not much protruded beyond the edge of the lamellae ; 

 dorsal cirrus none. Length 6-10" ; breadth 4'". 



Nereis caeca. Fabric. Faun. Grcenl. 304. Turt. Gmel. iv. 90. 



La Nereide aveugle = a species of Aonis, Aud. Sf M.-Edw. Litt. de la 



France, ii. 264. 

 Nephthys clava, Blainv. Diet. Ivii. 483. 

 Nephthys margaritacea, Johnston in Loud. Mag. Nat. Hist. viii. 341. 



f. 33. W. Thompson in Ann. Sf Mag. Nat. Hist. xiii. 439. 

 Nephthys cseca. Oersted, Grcsnl. Annul. Dan. 41. f. 73, 74, 77-86; 



Kroyer's Naturh. Tids. 1842, 123. Grube, Fam. Annel. 53. 

 Nephthys ciliata?, Rathke in Nov. Act. Acad. Caes. Leop. xx. 171. 



Ray Soc. Rep. 1847, 507. 



