378 LUMBRICONEKEIS LATREILLII. 



bears superiorly a series of winged tapering bristles with moderately elongated tips. 

 Similar bristles occur below the spines, and amongst them one or more winged, 

 jointed hooks, the ends of which have four or five spines behind the small hook. The 

 wing is narrow. The occurrence of these in the first foot, together with the pale spines, 

 aids in the discrimination of the species. 



At the tenth foot (Plate LXXITI, fig. 9) the outline shows a nearly horizontal dorsal 

 edge to the posterior lamella, whilst the ventral edge is long and sinuous. Above the four 

 pale spines the larger tapering winged bristles (three or four in number) occur (Plate 

 LXXXII, fig. 3). Beneath the spines are about four articulated hooks (Plate LXXXII, 

 fig. 3/;). The distal end of the shaft of these is slightly curved backward (i.e., from the 

 point of the hook), dilated, and, moreover, has a narrow wing on each side. The end 

 of the shaft is bevelled to a sharp point and has a posterior fillet, thus keeping to the 

 plan of structure seen in the SyllidaB, NereidaB, and other forms. To this edge is attached 

 the terminal piece, which is of considerable length, flattened, and diminished clistally, 

 then constricted at the base of the neck of the hook. The latter is small, with a crown of 

 several sharp spikes above it. The wings are somewhat narrow, so that the lines of the 

 distal region are nearly parallel. Minute striaB slant from above downward and backward 

 over the wings, and a fillet occurs at the neck of the hook. Besides the articulated hooks 

 one or two tapering winged bristles appear below the spines at the ventral border. 



This form of foot (Plate LXXTII, fig. 9a) with the compound hooks occurs as far as 

 the seventeenth foot or thereabout, but variations exist. Then simple winged hooks take 

 the place of the jointed. The foot also has a more abrupt inferior curve, so that greater 

 depth is given in lateral view. 



The thirtieth foot has three or four pale spines, a few rather slender simple tapering 

 bristles superiorly, and the stout winged hooks. At the thirty-fifth foot only a single 

 slender bristle is present, and the same at the fortieth, but this type disappears before the 

 fiftieth foot. 



In the posterior feet the hind lobe remains prominent, and the hooks (Plate LXXXII, 

 fg. 3 c) are distinguished by the large size of the primary fang. 



Reproduction, — An example from St. Peter Port, Guernsey, was distended with large 

 ova in July, and the appearances denoted that the functions of the alimentary canal must 

 have been considerably interfered with. 



Claparede thought that this species was closely related to L. Grubiana of Port- 

 Vendres, yet the hooks are different. 



The Lmnbriconereis oxychs&ta, of Gravier, 1 from Djibouti, on the Keel Sea, appears to 

 be allied in a very close manner with this common form. That so few representatives of 

 Southern Europe should be found in the Red Sea is a noteworthy feature. 



Mr. Crossland (in lit.) thought that the Lumbriconereis japonica, Marenzeller, of the 

 ' Challenger,' 2 might be this species (L. Johnstoni in that work), to which it is closely 

 allied ; but the posterior appendages of the maxillary apparatus are shorter in the 

 example procured by the £ Challenger,' and, as mentioned in the British form, 3 " the 



1 < Nouv. Arch. Mus. tVHist, Nat./ 4 e ser., t. ii, p. 275, pi. xiv, figs. 96—98. 



2 P. 243, pi. xxxvi, figs. 13 — 15; xviiA, fig. 17 ; and xviiiA, fig. 1. 



3 Op. cit., p. 245. 



