172 Prof. Mcintosh's Notes from the 



Carazzi * compares the former Avith the pedicellaria of 

 Echiuoderms. 



The fourth species, viz. Polydora carazzi, seems to be new, 

 the prostomium anteriorly forming a smoothly rounded pro- 

 cess, and thus characteristically differing from any of the 

 foregoing. This process projects very little in front of the 

 rounded lobes of the peristomium at the sides. The median 

 ridge is slightly contracted behind the process, and passing 

 backward terminates at the fourth bristled segment. The 

 moutli opens on the ventral surface as a long triangle with 

 a prominent lip on each side. No eyes are visible in the 

 spirit-preparations and no pigment,, but it may be different 

 in the living examples. The body, of which only the anterior 

 26 segments remain, tapers from the 4th segment forward, 

 the rest having nearly the same diameter; and it is a feature 

 that the 5th bristled segment is fully in a line with the 

 others, its untero-posterior diameter^ as usual^ being greater 

 than that of the segments adjoining. The first foot has both 

 a dorsal and a ventral lamella, but only a tuft of ventral 

 bristles,, the tips being directed rather outward than back- 

 ward, the convexity of the curve, however, being forward. 

 They are shorter than those immediately following. The 2nd, 

 3rd, and 4th feet offer no feature of note. The fifth foot 

 is unusually prominent, and bears dorsally a strong tuft of 

 capillary bristles, the flattened, winged, and rather short 

 tips of which curve somewhat abruptly backward. The great 

 hook-like bristles have the points of the main fang directed 

 backward and slightly upward, and each consists of a broad 

 flattened shaft (PI. V. figs. 4 & 5), which dilates from the 

 base to the distal third^ where a gentle curve backward and a 

 little diminution towards the throat occur ; but whilst the 

 inner outline is even, the outer shows a slight projection 

 rather below the throat, which is by no means narrow. The 

 strong main fang comes oflf at a little more than a right 

 angle, and the tip is not very acute. Moreover, the 

 crown of the fang seems to have the upper edge flattened 

 and prominent on each side, whilst distally a comb-like 

 crest with a serrated edge curves from the back of the crown 

 almost to the point of the fang, so that uncinus crista-galli 

 might be an appropriate name for such a hook. Indications 

 of striae which slope from behiud forward and upward show 

 that this crest is an aggregate of spines. Only a few bristles 

 occur in the ventral tuft of this segment. The 6th bristled 



* Mitt. Zoul. Stat, zu Xeapel, ii. Bd. p. -21. 



