Gatty Marine Lahoratorij^ St. Andrews. 115 



The anterior bristles are for the most part al)sent in the 

 example, hut, so far as ol)served, they ajjree with the descrip- 

 tions of Malmgren and Arwidssoiij viz. those with broader 

 and shorter wings and a curved tip, and those with narrower 

 wings and longer tips. The posterior bristles have much 

 elongated slender tips, with opposite spikes. The same kind 

 of bristle occurs in the posterior third, each bristle having a 

 well-marked curve and the tip forming a very long, delicate, 

 serrated hair. 



The hooks of this form appear to be longer than those 

 figured by Arwidsson ; indeed, if his figure (Taf. x. fig. 34')) 

 is perfectly typical for Asychis biceps, then doubt remains as 

 to the specific identity of the British s[)ecimen. The example 

 from the 'Knight Errant' differs in having the spikes on 

 the crown less elevated above a line passing from the lower 

 border of the great fang backward, and thus the hook has a 

 different character in that region. The same difference from 

 Malmgren's figure is observed. The smaller teeth on the 

 crown appear to pass on each side of the base of the great 

 fang ; at any rate raised striae are there. The opaque strife 

 running from the crown along the neck to the shaft are much 

 more strongly developed than in the hook shown by 

 Arwidsson. The curvature above the capillary bristles of 

 the throat differs, the neck itself is proportionally longer, 

 and the outlines of the neck to the shoulder are not in agree- 

 ment. The great length and curvature of the shaft is not 

 fully indicated by either author, so that this point remains 

 uncertain. 



The tube is a massive structure of grey mud 7-8 mm. iu 

 diameter, and at one end tapered to a blunt point which is 

 closed. The interior, which has a diameter of 4 mm., is 

 smooth, being lined by a somewhat firm membrane secreted 

 by the glands. Arwidsson gives in detail the number of the 

 hooks in each segment, the chief feature being that they 

 appear to increase with size and probably age. 



3. On the Maldanidse dredged in the ' Porcupine ' Expeditions 

 of 1869 and 1870. 



In the Expedition of 1870 Praxillella pratermissa was 

 procured at various stations, e. g. off Cape Guardia. This 

 species was also procured in 1869 in 358 fathoms at 

 Station no. 8, and at Station 17 a, 9 miles off Cape Fiuisterre, 

 iu 795 fathoms. 



Praxillella gracilis, Sars, occurred iu 81 fathoms off Cape 



