112 Prof. M'lntosirs Notes from the 



eighth segment, is distinguished by the great breadth of the 

 distal end of the hook, the large angle made by the great 

 fang with the neck, tlie close application of the gular bristles 

 to the lower border of the fansr, apparently almost springing 

 from the basal edge of the fang itself, and the numerous 

 and small teeth on the crown behind it, yet the crown is 

 rounded off instead of being high. The sliaft is of moderate 

 length, striated longitudinally, gently curved, and the slope 

 from the slight shoulder to the neck is gradual, then the 

 neck dilates in its progress distally and is boldly and 

 obliquely striated. 



Arwidsson* has recently described from Blacksod Bay 

 and other Irish waters a sixteenth form, viz. Casicirrus 

 neglectus, gen. et sp. n., and he identified it with the Axiothea 

 catenata of Cunningham and Ramage f. The anal funnel has 

 sevea longer clrri^ with several shorter between each. 



The seventeenth species, Asychis biceps?, Sars, was dredged 

 by the ' Knight Errant' in 35-37 fathoms off Castle Walker, 

 Loch Linnhe. 



In this species the cephalic plate slopes downward and 

 forward as in allied forms, but the entire border as well as 

 its surface differs from that of its allies. Thus the frontal 

 margin is almost the breadth of the body and is entire, and 

 behind it ventrally is the mouth in the form of a longitu- 

 dinal slit, from the anterior edge of which a line slopes back- 

 ward and outward on each side. Three large serrations occur 

 on each side between the cleft at the margin of the ventral 

 edge and the deep lateral fissure, one of these processes 

 occasionally being bifid. The deep furrow from the fissure 

 proceeds as far as the first bristle-tuft. The rest of the 

 lateral margin and the posterior edge of the cephalic plate 

 are cut into a continuous series of small serrations about 

 eighteen in number. In small examples there are fewer, 

 viz. from eight to twelve. The surface of the cephalic plate 

 has a flat ridge in the centre, but it does not reach either 

 the anterior or the posterior border. The nuchal organ 

 forms on each side a slightly flattened semicircle, commencing 

 anteriorly at the cleft of the frontal plate, then curving 



* Op. cit. p. 217, pi. xvii, figs. 1-9, pi. xviii. figs. 10-12, and pi. xix. 

 figs. 20-26. 



t Unfortunately this form has not yet been obtained for critical 

 examination. 



