34 Prof, ariutosli's Notes from the 



the preparations almost always coiled, only the tail is 

 generally more tapered than in the genus mentioned. It is 

 rounded dorsally and often dilated anteriorly, grooved ven- 

 trally, and terminating posteriorly in the anus, which may 

 have a simple crenate margin, though it generally shows a 

 more prominent ventral papilla, occasionally a smaller dorsal 

 papilla, or both a dorsal and a ventral, or, in the case of a 

 red example, with two dorsal papillaj or flaps and a ventral. 

 Probably much depends on the condition of the region with 

 regard to reproduction. In the pi^eparations dilatations 

 occur dorsally, both in the region of the scutes and, when 

 this part is contracted, in the region behind. 



The ventral scutes commence with the median tongue- 

 shaped one already mentioned, and laterally are tw^o small 

 scutes on each side, each of which abuts on a bristle-process 

 (first and second). Each of these has its inner edge bevelled 

 by the encroachment of the median scute. Six pairs of 

 scutes follow, for the deep median furrow separates the 

 respective sides. A rounded glandular scute of small dimen- 

 sions is conspicuous on several of the succeeding segments, 

 ■which have a longer antero-posterior diameter than those 

 in front. A glandular belt also envelops each bristle-tuft 

 anteriorly, and is continued, tliough less distinctly, pos- 

 teriorly, where the uncinigerous processes are more evident 

 than the setigerous. In the large northern variety from the 

 Hebrides and Shetland the glandular thickening at each 

 bristle-tuft is in some developed ventrally in the preparations, 

 so that four rows of scutes appear to be present. 



The pale golden bristles slope outward and backward 

 from setigerous processes of considerable length anteriorly, 

 which are bifid dorsally, the longer process being posterior, 

 and the margin curves inward ventrallv. The setigerous 

 processes become smaller in their progress posteriorly, and 

 cease before reaching the tail, the process itself showing 

 only the longer posterior papilla, the shorter being indis- 

 tinguishable. The number of the setigerons processes seems 

 to be variable, ranging from thirty-five to sixty, and, whilst 

 the anterior are conspicuous, the posterior are not easily 

 observed. The tianslucent pale golden bristles are in two 

 groups, a longer and a shorter. They are widest at the 

 pale base, and gradually diminish distaily, where they taper 

 to a fine point, which is curved. The longer and stronger 

 bristles are dorsal, the shorter and less robust ventral. The 

 shorter forms are much more slender, their tapering tips 

 alone projecting beyond the surface. 



The uncinigerous processes commence on the ninth 



