Gatty Marine Laboratory , St. Andrews, 23 



Pista cretacea, Grube, the twelfth species, is reaJily 

 distinguished, amongst other characters, by the peculiar 

 hump on the posterior outline of the hook just above the 

 base. It comes from the south-west of Ireland and other 

 regions in deep water. 



The Hebridean example of <S^cione maculata, Dalyell (?j,the 

 thirteenth form, has tlie cephalic region so injured that all 

 that can at present be said about it is that it appears to 

 correspond with that of allied Terebellids. 



Body apparently about 2^ to 3 inches in length, and of 

 the typical outline. In spirit it had at first a reddish-browu 

 appearance, and was everywhere speckled with white, with 

 the exception of the ventral scutes. 



The number of the pale golden bristle^bundles is unknown. 

 The shafts are uearly cylindrical till near the end, where 

 they are slightly narrowed below the wings, Tbe tip is 

 gentiy tapered to a fine extremity, and furnished with a 

 narrow wing on each side. 



The hooks are distinguished by the straightness of the 

 posterior border and by the presence of only a single tooth 

 above the large fang, which stands nearly at a right angle 

 to the posterior outline. The anterior outline below the 

 great fang is not elongated, and has the process for the 

 ligament about its mid lie, the edge beyond it having a 

 slight incurvation, The basal region is deep and com- 

 paratively short in contrast with that of Terebella nebiUosa, 

 another form having only a single tooth above the great 

 fang. The inferior outline is convex, with a slight sinuosity 

 at either end. On the whole, the general outline of the hook 

 approaches that of Pista cristata, while materially differing 

 in detail. 



The southern Lepr<Ba lapidaria, L., the fourteenth species, 

 has ou the cephalic plate a well-marked dorsal rim, which 

 curves laterally to become continuous with the highly-arched 

 supra-oral fold, often thin anteriorly. It bears numerous 

 slightly..grooved tentacles, which also differ from those of 

 many other forms in adhering after preparation. They are 

 pale yellow in life, with the red blood-vessel in the centre. 

 The buccal process or "tongue" inferiorly often projects as 

 a smoothly-rounded mass obscuring the rim of the segment 

 behind it. The structure of the cephalic region of this 

 inhabitant of fissures in rocks does not differ materially 

 from those which dwell in tubes, except that the lingual 

 process or boss is large and that the tentacles show only 

 a slight groove at the base, and it seems to disappear from 



