8 NEPHTHYS (LECA. 



N. cirrosa. (3) The posterior lamellae of both divisions of the foot long — only in the 

 anterior segments, K discors. (4) The posterior lamellae in both divisions of the foot in 

 all the segments short, N. ciliata, N. longisetosa, JV. incisa. He comprehended under 

 Nephthys, Aonis, Savigny, Biplobranchus, De Quatrefages, and Aglaophamus, Kinberg. 



In P. Tauber's critical revision 1 of ' Danish Annulata,' four species of Nephthys are 

 entered, but he includes N. longisetosa, (Ersted, under N. Hombergii, and appears to be 

 inclined to do the same with N. incisa, Mgrn. One of the species is N. paradoxa, Malm. 



Levinsen 3 in his systematic account of the Norwegian Annelids gives eight species 

 of Nephthys, but as JSf. Malmgreni and N. minuta of Theel and N. paradoxa and 

 A. emarginata of Malm are four of them, further revision is needed. 



Baron de Saint- Joseph 3 points out the importance of the foot in diagnosing the 

 various forms, and the necessity for contrasting these organs from the same region of the 

 body. In criticising Wiren, who groups certain species together on account of the 

 variations of the feet in any given example, he truly observes that though these variations 

 do occur in each, yet they essentially differ from each other. 



The large foliate organs of A. trlssophyllus, Grube, from Naples, show how these 

 lamellae can be developed. Moreover, the great elongation and comparative straightness 

 and slenderness of the bristles of this species are diagnostic. 



I. GrEOUP WITHOUT A LONG UNPAIRED CIERUS. 



1. Nephthys oeca, 0. F. miller, 1776. Plate XLIII, fig. 1; fig. 2 var. ciliata; 

 Plate LVII, figs. 1-5; Plate LXVI, figs. 1-3— foot; Plate LXXVII, figs. 1-P— bristles. 



Specific Characters. — Head rounded in front ; eyes usually absent (two small on 1st 

 segment, St. Joseph) and two papillae (sensory) at posterior part of head. Body twelve 

 or more inches long, 130-136 segments ; exserted proboscis with twenty-two distal rows of 

 papillae, ^ve, or occasionally six, being in each row. The lip with ten forked papillae 

 and a median simple one at each side. Dorsal lamella of the foot fan-shaped and 

 prominent, its deepest part being external ; dorsal cirrus short and tapering ; branchial 

 process coiled externally, of moderate length, with a semicircular flap of the spinigeous 

 lobe at its base anteriorly. Ventral division with a large, broadly lanceolate and pointed 

 lamella continuous with the fleshy lobe of the region ; ventral cirrus of moderate size 

 slightly flattened and conical. Subulate (barred) bristles typical. The capillary bristles 

 have a flattened blade with a close series of fine spikes. Segmental organs opening at the 

 base of the feet ventrally. Tail terminating in a single long cirrus. Muscular walls of 

 body typical. 



1 Kjobenhavn, 1879. 



2 Yidensk, ' Meddel. f. d. natudh. For. Kjobenli./ 1883. 



3 i 



Ann. Sc. Nat/ 8 e ser. xvii, p. 1, 1894. 



