14S Prof. M'-Intosli's Notes from the 



i'or a Syllid aud ends in a conical tip, and, with the exception 

 of the three anterior segments, the organ is more or less 

 ringed. It therefore differs from that generally seen in the 

 Staurocephalidae, though obscure rings are occasionally 

 present in these, while in the form of the conical tip it agrees 

 with that group (Staurocephalidae), as it also does in the 

 absence of the tapering form so characteristic of the Syllids. 

 The setigerous lobe again has a conical process superiorly 

 more marked than in the majority of the Syllids, yet it is 

 not always present in the Staurocephalids. The tip of the 

 spine terminates in a large flattened and roughened knob, a 

 condition approaching that observed in certain Syllids, such 

 as OdontosyUis ctenostoma, Si/Ilis spongicola, &c. A striking 

 feature is the occurrence at the dorsal edge of the fascicle of 

 bristles above the spine of a single simple bristle, which is 

 curved, slightly thickened, and flattened distally, and with a 

 blunt bifid tip. At first sight this bristle resembles that 

 found in certain Staurocephalids, such as Staurocephalus 

 rubrovittatus. Further, the fan of compound bristles which 

 follows forms two groups in the text-figure, an arrangement 

 observed in certain Staurocephalids, the large size of the 

 terminal processes and. their bifid tips also resembling those 

 of the latter *. On the whole, therefore, the structure of the 

 bristles would indicate relationship with the Staurocephalidae 

 as well as with the Syllidte. In the sexually mature 

 examples a tuft of long delicate capillary bristles arising 

 from the dorsal and posterior face of the setigerous process 

 occurs on each foot after the eighth. Such bristles occur in 

 the sexual pelagic forms of both Syllids and Staurocephalids, 

 and have no spine in either. 



The ventral cirrus, from its proportionately great length 

 and slightly crenate condition, diverges from that usually 

 found in the Syllidse or Staurocephalidse, yet it agrees with 

 both in being borne by the setigerous lobe, and, as a rule, 

 well outward. 



On the whole, then, Mr. Moore's form presents interesting 

 features of relationship Avith both groups, the shape of the 

 head, the peculiar palpi, the tentacles aud the proboscis, the 

 absence of a dental apparatus, and the pygidium leaning so 

 far to the Syllids, whilst the structure of the foot and its 

 bristles recall certain features observed in the Staurocephalids. 

 More minute details of the structure of the foot and bristles 

 by the author would be useful in enabling a more precise 

 view of its relationships to be made. 



* Fig. 2 d. 



