HAPMOTHOE SPIXIFEEA. 329 



Feet. — The first foot shows dorsal bristles, which are little altered from the typical 

 form. 



The second foot has dorsally a series of short broad bristles, the tips especially 

 being characteristic. Yentrally the shafts of the bristles of the region are stout, and 

 the spinous tips well marked. The superior bristles have very short smooth tips, which 

 are bifid. There is thus less change than usual in the foot. 



In the typical foot the superior branch bears a short cirrus, the tip of which (in 

 spirit) reaches the extremity of the bristles. It is almost cylindrical, except near the tip, 

 where a gradual diminution occurs. The surface has rather numerous stout clavate cilia, 

 which are best developed on and near the slight enlargement below the filiform tip. The 

 ventral cirrus has an enlarged base, reaches a little further than the insertion of the 

 inferior ventral bristles, and has a few stout clavate cilia. 



The dorsal branch of the foot has comparatively short and not very stout bristles, 

 slightly curved, and finely serrated. The smooth tips are peculiar, being fashioned like 

 a blunt Esquimaux harpoon or paper-scraper, as represented in one of the larger 

 examples (Plate XXXVIII, fig. 17). The spinous rows at the distal part project 

 characteristically at a greater angle than usual, but are generally obscured by dense 

 granular parasitic growths and much 



The ventral bristles have comparatively stout shafts and short spinous regions. 

 The smooth tip is also short. Every bristle is boldly bifid. The superior series (with 

 longer spinous rows) have a very short smooth region (Plate XXXVIII, fig. 18), the 

 longer terminal part being only diminished on its dorsal edge — not hooked, while 

 the secondary process is stout and goes straight to a point, thus differing from the 

 attenuated divisions of Parmenis ljungmani. The smooth tips of the middle and inferior 

 bristles (Plate XXXVIII, fig. 19) are somewhat longer and have a slight hook, but the 

 secondary process is straight. The spinous regions in these are proportionally 

 short. 



Reproduction. — The specimens procured in July had the ova well advanced, so that 

 their spawning period would seem to be in autumn at latest. It is interesting that 

 the examples of Ehlers and De Saint-Joseph also carried eggs. The latter found a 

 specimen of 7 mm. in the same condition. 



This species presents considerable differences from Parmenis ljungmani, Malmgren. 

 The body is larger and broader, the segments thirty-seven instead of thirty-five or 

 thirty-six; the head is more elongated, and the arrangement of the eyes different. Thus, 

 for instance, the smaller anterior eyes in the northern form are situated at an incurved 

 region of the head just in front of the middle. The dorsal bristles are thicker than the 

 ventral, and have the peculiar tips indicated, whereas in P. ljungmani the tips are simply 

 tapered. The ventral bristles have short spinous regions in both, but in the Zetlandic 

 form the tip is less hooked, and the secondary process is short, stout, and straight. 

 There are points of similarity between the forms, but there is no warrant for uniting 

 them. 



The Polynoe spinifera of Ehlers approaches this species very nearly, and he probably 

 overlooked the papillas on the palpi. It is possible the small size of his example (7 mm.) 

 may have been the cause of certain variations. The figures and remarks of Langer- 



