SCALIBREGMA INFLATUM. 



37 



four are borne by conical— dorsal and ventral— processes elevated on pads. The bristles 

 (Plate CIII, fig. 7) are finely iridescent, and form slightly radiate tufts which are fairly 

 conspicuous throughout. Dr. Ashworth observes that in unworn specimens minute spikes 

 occur on the distal third. These have not been observed in spirit-preparations. The 

 next nine or ten are similar in structure, but the pads are smaller. As indicated by 

 Ashworth, the delicate tips of these have minute spines. In addition, a series of furcate 

 bristles (Plate CIII, fig. 7 6) occur in each foot, but they scarcely project beyond the 

 surface. The shafts of these taper a little toward the tip, the bristle enlarging below 



Gen.C. 



Fig. 104. — Segmental organ of Scalibregma inflatum, H. Ratlxke, after Dr. Asli worth. Gen. C. Genital cells. 

 N. 0. Nephridiopore. Nphs. Nephrostome. Sept. Septum. 



the fork, the limbs of which are unequal. Moreover, the inner edge of each of the prongs 

 is densely spinous. 



The dorsal and ventral divisions of the feet toward the posterior part of the region 

 just noted show a tendency to the development of a cirrus, so that about the fifteenth or 

 sixteenth foot a dorsal and a ventral cirrus are evident. These gradually increase in size 

 until, in the posterior region, they form evident lobate lamellse (Plate LXXXVIII, figs. 4 

 and Text-fig. 101), somewhat lanceolate in outline, and having the setigerous process at the 

 inner base of each — that is, below the dorsal and above the ventral. In some preparations, 

 notably in one from Lochmaddy, the dorsal and ventral cirri are unusually elongate. The 

 specimen, however, was fragmentary. Toward the tail the feet diminish, and appear to 

 be absent from the last three or four segments. 



The cirri are furnished, as Rathke showed, with a series of glands which in the 



