94 Prof. M'lutosh's Notes from the 



gular bristles 'pass forward and curve above the tip of the 

 fang. The neck is slightly striated obliquely, but though 

 the enlargement beloAv the shoulder is somewhat opaque, 

 strife are indistinct. The hooks vary very little from the 

 typical form, those of the last row in front of the funnel 

 being perhaps somewhat smaller, but having the same high 

 crowns with at least five teeth above the great fang in lateral 

 view. 



The bristles consist of the usual two groups, viz. those 

 with stouter straight shafts and tapered tips with distinct 

 wings and a dense group of more slender forms with fine 

 hair-like tips, which in the preparations are coated with 

 particles and probably are minutely spiked in the fresh 

 example. 



The small cylindrical tubes are formed of secretion coated 

 with sand-grains, minute fragments of shells, and an occa- 

 sional foraminifer, whilst one or two are anchored by the 

 secretion to a small pebble. 



The fifth representative of the family is Isocirrus (D) from 

 Shetland and the Hebrides. So far as a softened though 

 large example from the Hebrides shows the cephalic plate, 

 while ha%T.ng a general resemblance to that of PraxiUtlla 

 pratermissa, differs from it in the crenate condition of the 

 margin, and in the shallow nature of the notches both lateral 

 and posterior. Yet in some large examples of P. prceter- 

 missa a crenate margin is also present. The keel, nuchal 

 grooves, and frontal process are similar. No example is 

 perfect, but accompanying the anterior region is a detached 

 funnel and adjoining unarmed segments (four) Avhich appa- 

 rently pertain to a form of similar size, and which has 

 twenty-seven equal or nearly equal short conical cirri. The 

 funnel is much softened and no anal cone is visible. In 

 another fragment of the posterior end of a smaller example 

 a similar funnel occurs with a nearly similar number of cirri 

 of like shape. An anal cone, slightly pentagonal in form 

 and somewhat eccentric in position, is present in this case. 

 In a funnel from the Skerries, Shetland, of similar size to 

 the last, only twenty-three cirri occur, and the anal cone is 

 slightly marked. A feature in all the examples is the massive 

 condition of the ring at the base of the caudal funnel, for it 

 forms a firm projecting shelf from the centre of which the 

 base of the funnel arises. The cirri, moreover, stand stiffly 

 out. 



The body is typical in form, the first eight bristled segments 

 anteriorly being furnished abundantly with glands in belts, 



