458 LYSIDICB PUNCTATA. 



question. It also occurs under the large coarse Ascidians, the test of which forms the 

 arch of the tunnel, the stone forming the base. It probably enlarges its tunnels. It also 

 was found in Gellepora dredged off St. Peter Port, and amongst the roots of Antenmilaria 

 and sponges (Col. Fraser and Capt. Powell) off the south coast of Sark. Isle of Wight, 

 Luccomb Chine (W. C. M.). Weymouth (P. H. Gosse). Plymouth (Baird and Allen). 

 It extends to Ireland, where it has been procured at Connemara (A. Gr. Moore) and Gal way 

 (Prof. B. P. Wright). 



Shores of France. Keferstein found them in tubes of mucus and mud near low 

 water-mark at St. Vaast; Mediterranean; Canaries (Langerhans). 



Head broad and flattened, with a median notch anteriorly, while inferiorly are two 

 thick prominent lobes (palpi). Eyes two, black, of considerable size. The median 

 tentacle is a short, somewhat fusiform process, constricted at the base and again 

 diminished toward the tip. It is placed somewhat in front of the two lateral tentacles, 

 which have a similar shape. The colour of the head is pale brownish dappled with pale 

 dots, the nuchal border being rather darker. 



Body elongated, reaching 6 — 7 ins., slightly tapering anteriorly and more decidedly so 

 posteriorly, where it terminates in four caudal processes — two longer dorsal and two shorter 

 ventral cirri, the former being also wider at the tips. The dorsal arch is rounded, the 

 ventral surface flattened, with a median groove, and uniformly tinted. 



The first three segments are tinted of a deeper brown hue than the rest of the body 

 and dappled with pale spots. The first is broader than the two succeeding. The first 

 and second are devoid of feet, as in Notocirrus. The fourth segment is pale anteriorly, 

 and thus makes a contrast with the preceding. In some the posterior border of this 

 segment is brownish, speckled with pale dots. In others the fourth segment is white, as 

 also is the half of the succeeding (Ehlers). The coloration indicated (brownish with pale 

 dots) stretches to the twentieth or twenty-fifth segment, and fades into the general brownish 

 iridescence of the body, with a slight shade of purple. A specimen trawled off the south 

 coast of Sark by Col. Fraser and Capt. Powell had only a white patch between the eyes, 

 instead of the usual white belt on the fifth segment. 



The segments in the middle and posterior part of the body are boldly outlined, while 

 the feet are less differentiated, the bristles being borne on the prominent edge of the 

 segment, which is also marked by a transverse median riclge. Posteriorly the body 

 terminates in four cirri, which spring from below the vent, the upper being longer than 

 the inferior pair and their bases wider apart. 



The proboscis (Plate LXIII, fig. 6) has a pair of strongly curved maxillas with a 

 shoulder posteriorly, and long, slightly tapered posterior appendages, which have a shallow 

 notch in the middle. The great maxillary plates have four prominent teeth on each side 

 anteriorly ; the curved anterior plate on the left has four rather blunt and rounded teeth, 

 that on the right about six, each has a blunt conical nodule in front, and there are 

 horny bars laterally. The mandibles (Plate LXIII, fig. 6 a) are proportionally large and 

 deeply curved from side to side, so that in many preparations the upper jaw apparatus 

 lies in the cavity thus formed. This curved anterior region is large, occupying about half 

 the total length of the teeth. It has on its upper surface a longitudinal black bar. The 

 dental limbs posteriorly terminate in two blunt processes. 



