LTJMBBICONEEEIS IMPATIENS. 379 



dorsal winged bristles are longer and more attenuate, as are also the jointed hooks, the 

 crowns of the latter, moreover, being less distinctly serrated. The bristles are more 

 numerous in the Japanese species, and the posterior lamellae more acute superiorly. The 

 spines in the foreign forms are black, whereas in the British they are pale." It is possible, 

 however, that intermediate forms may yet occur which will render it necessary to modify 

 the views here expressed. 



3. Lumbhioonebbis IMPATIENS, Glaparecle, 1868. Plate LXII, fig. 2 — mandibles; Plate 

 LXV, figs. 8 and 8 a— teeth ; Plate LXXIII, figs. 10-10 6— feet; Plate LXXXII, 

 figs. 4-4 d — bristles. 



Specific Characters. — Head forming a blunt cone, with conspicuous ciliated organs 

 posteriorly ; body typical, but the bristles are somewhat longer than in L. fragilis. Tail 

 terminating in four short cirri. MaxillaB strong, with curves which keep to the hori- 

 zontal. Great dental plates each with four teeth ; right anterior plate has three small 

 teeth, whereas the corresponding plate on the left has only an unbroken edge. The other 

 plate has a single tooth. An accessory horny plate and a curved band passing toward 

 the great dental plate complete the upper system. The conformation ventrally resembles 

 that of L. fragilis. The mandibles form a long, narrow wedge on each side, and are 

 fused along one-third of the inner border ; marked by five curved brown lines anteriorly 

 and by madder-brown longitudinal lines on the reverse side. 



First foot is distinguished by the occurrence of long, narrow, un jointed winged 

 hooks and of black spines. Feet in front of seventh show an irregularly conical posterior 

 lobe, somewhat like that of L. gracilis, and a narrow anterior lobe. The long winged 

 hooks occur below the spines, and their flattened terminal pieces have nearly parallel 

 sides. These hooks become modified in progress backward, so that at the twentieth foot 

 they are considerably shorter. The dorsal winged tapering bristles form two groups at 

 the thirtieth foot, and they by-and-by diminish, disappearing in the posterior feet. At 

 the fiftieth foot the winged hook has a short tip, and the chief fang is larger ; three black 



spines. 



The upper neural canal is often very large, with the usual coagulable contents, and 

 a smaller median canal occurs below it, besides a lateral, which, however, varies in 

 appearance as if from branching (Fig. 78). 



Synonyms. 



1825. Lumbricus fragilis, Delle Cliiaje. Mem. Anim. s. Vert.,ii, pp. 409 and 428, Tav. xxviii, f. 8 — 20. 

 1841. Lumbrinereis fragilis, idem. Descriz. e. not., iii, p. 83, Tav. ci, f. 8 — 11 and 14 — 20. 

 1868. Lumbriconereis impatiens, Claparede. Annel. Nap., p. 145, pi. ix, f. 2. 

 1868. „ breviceps, Ehlers. Borstenw., ii, p. 388. 



1885. „ „ Cams. Fauna Medit., p. 215. 



n impatiens, Pruvot. Arch. Zool. exper., 2 e ser., t. iii, p. 279, pi. xi, f. 5, and 



pi. xiv, f. 1 — 3. 

 1893, } v F. Buchanan. Quart. Journ. Micr. Sci., n.s., vol. 34, p. 537. 



1898. „ De St. Joseph. Ann. Sc. nat., 8 e ser., t. v, p. 279. 



