52 Piof. M«Intosl»'s Notes from the 



bristles the uucinigerous rows become sliobtly more promi- 

 nent, and soon form conspicuous vcutro-hiteral processes 

 ahnost to the tip of tlie tail. The iiooks, which are uniform 

 iu structure throughout (PI. II. fiii'. 9). are characterized by 

 the elevated crowns, with four or five sharp teeth above the 

 great fang, a convex dorsal outline and a deep incurvation 

 above the base, the posterior angle of which h;is a well- 

 niaiked process ; the inferior outline is convex, whilst below 

 the great fang is a prominent process from which the outline 

 slopes to the i)row. 



Artacamd ainadensis, sp. n., is not uncommon in water of 

 some de[)th in the Gulf of St. Lawrence. Hitherto the genus 

 has been found chiefly in northern latitudes, such as Spitz- 

 bergen and Norway, and has not heen met wnth in tiie British 

 area. It is distinguished by its bulbous and symmetrically 

 rugose buccal region, from \\hich the everted proboscis in 

 seme cases projects as a papillose globular mass with a con- 

 spicuous cone at the apex. The cephalic plate is peculiar, 

 for it is produced posteriorly into two lobes, rounded distally, 

 whilst its ventral margin forms a frilled funnel, considerably 

 elevated above the mouth, though the arrangement of the 

 parts corresponds with s[)ecies in which the mouth is iu the 

 central j)art of the frills ventrally. The plate has a distinct 

 dorsal collar. 



The body is enlarged anteriorly, the snout bt-ing somewhat 

 bulbous, and tapered posteriorly to a slender tail with a 

 terminal anus. It is rounded dorsally, flattened and grooved 

 vent ally, and tiie segments are distinctly marked, the 

 anterior having two rings and the posterior three in a large 

 example. Eight of the anterior segments, ventrally, have 

 ■wide glandular l)elts, and thereaiter are five central glandular 

 shields. In a small example with a complete posterior end 

 the terminal segments appeared to be only two-ringed^ and 

 finally only a single ring characterized the nine or ten 

 segments. 



The branch ife are in three groups on the second, third, and 

 fourth segmiMitSj and their filaments are smaller than in such 

 as Thelepns. Each spiings from a central point, from which 

 the twenty or more filaments diverge, and when torn they 

 adhere by their bases. 



The anterior region bears seventeen paiis of setigerous 

 processes, which are flattened lamellse with oblique distal 

 edges, the dorsal being the most prominent, whilst the 

 anterior lip projects heyond the surface. They bear two 

 series of pale golden bristles, viz. a longer and a shorter. 



