Gatlij Marine Lahoratonj, St. Andrews. 0.'^ 



with the narrow anterior end of tlie cephalic phxte, distin- 

 guish it from Praxilli'lld. I'^yes were present in the living 

 form, but unfortunately they arc now invisible. The pro- 

 boscis has the usual outline of a globular button on extru- 

 sion, and appears to be sniootli. 



The body is comparatively small, with a slight constriction 

 anteriorly, and then continues of a nearly uniform diameter 

 to the posterior end. The first seven segments are shorter 

 than those which follow, and their feet are in front of the 

 middle of the segments, whereas those behind them have 

 the feet towards the posterior border of the segment. The 

 last two l)ristled segments are shorter than those immediately 

 in front, and belund them are four segments devoid of 

 bristles, viz. a short urn-shaped segment with glandular 

 ridges at the end and three closely aggregated rings with 

 traces of lateral glandular thickenings in two, the last 

 bearing the funnel. The usual median ventral ridge runs 

 from the anterior to the posterior end, where it is opposite 

 the longest cirrus, which is flattened and not much tapered. 

 The long and the short cirri are arranged more or less 

 alternately, one or two of the short occurring between the 

 long. lu the centre is a flattened anal cone with the anus in 

 the middle. The number of cirri varies from seventeen to 

 twenty-three. 



The first three segments are spinigerous and have besides 

 the usual tuft of bristles. The first foot has two minute 

 spines, one slightly curved and tapered from base to apex, 

 the other with a shoulder and blunt tip. The second foot 

 l)as on one side spines of the foregoing shape and on the 

 other a modified hook, which has a shaft narrowed at the 

 base but thereafter nearly cylindrical to the shoulder, and with 

 a short slightly tapered neck. The main fang is rather long, 

 makes more than a right angle with the neck, and has 

 several rudimentary teeth on the flat crown behind it. The 

 third foot has on one side spines and on the other a single 

 large hook similar to that in the foregoing foot, but with a 

 more distinct curvature of the shaft and enlargement below 

 the shoulder. The fourth foot shows a series of nearly 

 normal hooks, which are smaller than those of the third, 

 have a marked curve of the shaft which tapers from the base 

 to the shoulder, the neck being narrowest immediately 

 beyond it, for it dilates thereafter to the crown, the height 

 of which is characteristic. Tiie great fang leaves the neck 

 at a little less than a right angle, and in lateral view has 

 four or five teeth above it, sloping downward from the high 

 crowu. Almost immediately beneath the great fang the 



