Gatty Marine Lahoratorii, St. Andrews. 21 



Hooks appear in the ventral divisions of fifteenth to 

 sixtcciitli foot. At the twentieth foot the branchia retains a 

 similar sliape and is still large, with the dorsal lamella on 

 its onter edge. The bristles are similar to those in front. 

 Vcntrally the lamella has much increased in depth, and is 

 separated only by a short gap from the dorsal, where its 

 breadth is greatest, for it diminishes vcntrally. From its 

 lower edge fully half its border is occupied by hooks, which 

 are closely arranged inferiorly, but have more space 

 superiorly. The shaft of the hook dilates from the base 

 upward to the bold forward curvature, when it slightly 

 diminishes to the neck, from which the proportionally large 

 main fang comes off at a little more than a right angle. A 

 single spike (in lateral view)occiirs on the crown. Distinct 

 wings guard the tip of the hook, which is thus in reality 

 hooded. The lamclloc of the feet are most prominent in the 

 posterior part of the body, and thus differ from those of 

 N. longirostris, and the latter lives in clean sand, whereas 

 N. trideiitata frequents Larainariau roots {Southern). 



In the ' Annals and Magazine of Natural History,' ser. 8, 

 vol. iii., February 1909*, a form from the 'Porcupine' 

 Expedition of 1869 was alluded to under the title of Scoleco- 

 lejjis (1). This has now been definitely termed S. lamellata, 

 with the following characters : — 



Head with an even trausverse margin in front, a short 

 blunt tentacle at each angle, and from the centre a short 

 elevated region proceeds backwards to end in a small pi'o- 

 cess which is pointed posteriorly like an adherent tentacle. 

 Minute eyes seem to be present on each side of the latter, 

 but the condition of the specimen renders accurate deter- 

 mination uncertain. The whole region is short, and the 

 proboscis is thrust out as a short cylinder with a crenate 

 margin. Body fragmentary, flattened, slightly and abruptly 

 tapered anteriorly, and with a median band vcntrally. The 

 segments are narrow and numerous. The first foot carries 

 a subulate branchia and a large lanceolate lamella projecting 

 freely U])ward nearly as far as the branchia. The latter 

 remains subulate at the fiftieth foot. Dorsal bristles of the 

 first foot slender, long, and finely tapered, and the ventral 

 are also long and slender. Behind the tenth foot the bristles 

 are similar and of a dull golden colour. The ventral bristles 

 form two groups, viz., upper finely tapered forms and a lower 

 series of shorter broader bristles overlapping the former, 



* P. 17«>. 



