52 Prof. M'Intosh's Notes from the 



middle of the body considerable flattening occurs and the 

 markings just described fuse and disappear, the segment, Avith 

 the foot on each side, being only variegated by pigment; 

 and this continues to the posterior cud of the fragmentary 

 specimen, in which reproduction of the caudal region had 

 commenced in the form of a short median papilla uith two 

 proportionally large caudal cirri. On the ventral surface 

 the segments are simple in front, then show a tendency to 

 two lateral fillets and two median parts — an anterior broader 

 and a posterior narrower. Posteriorly the segments become 

 simple, as on the dorsal surface, a dimple marking the median 

 region and then disappearing. 



The proboscis is a long, tough, and muscular organ, having 

 at the ba«e of its first region two long rows of V-shaped 

 denticles, eighteen in number, with a speck in addition 

 beyond them. At the distal end of this region (in extrusion) 

 are a pair of jaws, near each other, with a dense series of 

 denticles between them, whilst the longer ventral space has 

 a linear series of upwards of twenty in number behind the 

 papillie. The latter are about seventeen or eighteen in 

 number, blunt and flattened. One of the larger jaws has 

 three prominent teeth, the other three. They lie just within 

 the ring of bluntly conical papilhc. 



The lirst segment bears at each side a small lanceolate lobe 

 on the anterior edge, and on the posterior a foot of three 

 lobes, the ventral being the larger and the dorsal next. No 

 bristles were present in the example. The succeeding feet 

 have four or five lobes, and they increase in size. 



Five lobes exist on the 10th foot (PL IV. fig. 5), the 

 dorsal being large and lanceolate, with an indentation on the 

 dorsal edge, so that the lobe has the aspect of a foot, the 

 three middle digit-like, and the ventral being a long lanceo- 

 late process. The dorsal, ventral, and the posterior lobes 

 reach to the same vertical plane, whilst the two shorter ante- 

 rior lobes fall considerably within it. Of the two latter 

 (anterior) the upper is the longer. 



The 20th foot has the same number of lobes, tlie large 

 doisal and ventral, two anterior in front of the bristles, and 

 a much larger lobe behind the bristles. 

 Only compound bristles are present. 



A-bout the 35th foot a small lobe appears in front of the 

 flattened dorsal lobe or cirrus, with a spine and a series of 

 dorsal bristles, thus completing the bifid condition of the 

 foot. 



At the 40th foot is a superior division with a second spine 

 and a group of simple dorsal bristles, the dorsal cirrus or lobe 



