106 Prof. M'liitosh's Notes from the 



but in the presence of a distinct ridge or process for the 

 guhir bristles. There are twcuty-seveu short cirri oii the 

 iuunelj but no longer process, though one is double. The 

 same condition is seen in certain forms dredged at nos. 35 

 and 36 and in 125 fathoms off Cape Rosier, Canada_, 1873. 

 Further investigation ot these is necessary. 



A large example from the Outer Haaf, Skerries, Shetland, 

 had the rim of the cephalic plate less developed and the 

 antero-lateral margins slightly crenate, but otherwise it does 

 not seem to ditler. A specimen of medium size again, from 

 a depth of 90 fathoms off North Unst, presented a very long 

 process for the dorsal bristles in several of the posterior 

 segments (even to the third ironi the anal funnel), so that 

 the foot at tirst sight a[)pearcd to iiave a short ciirus. 



The tubes are composed ot sand uith a lining of tough 

 secretion. They are comparatively soft, though in small 

 specimens from tiie Outer Haaf, Skerries, tlie minute grains 

 of sand and shells clung tenaciously to the lining. Frag- 

 ments ot shells and of Ditrypa tubes are attached to some 

 from the same region. 



Axiothella zetlandica, the thirteenth British species, was 

 dredged by Dr. Gwyn Jeffreys in St. Magnus Bay, Shetland, 

 in 100 fathoms. The cephalic plate slo})es downward and is 

 concave rather than convex, and has a remarkably wide and 

 somewhat thin margin, and a minute central process in 

 front, the general lorm of the surface l;eitig rounded rather 

 than ovoid. From each side of the minute median process 

 the broad and thin antero-laateral flaps pass backward to 

 the notch, which is, thougli pronounced, superficial, that is, 

 it is confined to the outer half of the flap, and its direction 

 is slightly forward. The postero-lateral margin behind the 

 notches is differentiated by its stria? and crenate edge. Six 

 larger marginal crenations are divided into two, three, or 

 four subdivisions. This margin is narrower than tlie antero- 

 lateral and stands more or less erect, whilst the antero- 

 lateral is procumbent. The very narrow keel arises a little 

 behind the middle and posterior to two nearly transverse 

 grooves which run inward from the margin, and by a slight 

 enlargement from the anterior edge of a rounded area. It 

 widens as it approaches the median frontal process, again 

 contracts as it joins it, so that its outline is somewhat 

 clavate; or, if the posterior area is considered, like the 



gymnastic club o o. On each side is a long, slightly 



narrower ridge, which ceases at the enlargement of the keel 

 in front, but springs from the side of the keel in front of the 



