Oatty Marine Laboratory, St. Andrews. 535 



most attenuate at the distal end. This process ends in a 

 ventral enlargement carrying on its anterior edge a band of 

 hooks, each of which has about ten fangs. Besides, two flaps 

 on the ventral surface carry hooks with ten or eleven teeth 

 or fangs. Altogether there are thus four rows of hooks in 

 each segment, and the individual hooks vary little in the 

 several rows. The dorsal processes gradually diminish 

 posteriorly and end in two small and somewhat lanceolate 

 processes on each side and below the level of the anus. 



The three great lamellae on the dorsum of the middle 

 region of the body are waved to and fro, as if performing 

 a respiratory function either for blood or ccelomic fluid. 

 Their muscularity is considerable, so that a vigorous fanning 

 motion from front to rear is caused. 



What apparently is a Spiochcetopterus was dredged in Loch 

 Linnhe on the 7th September, 1882, in 35-37 fathoms, and 

 similar tubes come from various parts of the British shores. 

 The tube is rigid, hard, and brittle, breaking under the forceps 

 like the ossific tissue of young teleosteans and in short 

 fragments. Somewhat faint rings encircle the tubes, but the 

 intervals are not quite regular. The anterior end of the 

 annelid is absent. Each segment has dorsally a pair of 

 setigerous processes bearing a group of about four bristles, 

 with long shafts and flattened tapering tips. Two flaps or 

 flap-like processes occur on the side below the foregoing and 

 bear hooks which are exceedingly transparent and the out- 

 line of which is difficult to follow. They appear to approach 

 those of Spiochcetopterus, a form whose range extends to both 

 sides of the Atlantic. 



5. On the same Families dredged in the ' Porcupine ' 

 Expeditions of 1869 and 1870. 



A species about the size of Stylarioides glauca is Styla- 

 rioidesflabellata of Sars (PI. XII. fig. 1), which was dredged in 

 the ' Porcupine ' Expedition of 1870 on the Channel Slope 

 at Station 6, 48° 26' N., 9° 44/ W. in 358 fathoms. It is 

 readily distinguished from S. glauca by the dense coating of 

 sand-grains, by the ferruginous hue of the posterior region, 

 the stronger frontal bristles, and the conical anterior process 

 with its long papillae. The body is rounded, about an inch 

 in length in the preparations, slightly enlarged at the anterior 

 third, and gently tapering to the posterior end, which forms 

 a short cone with the anus in the centre. 



38* 



