178 Prof. M'Intosli's Notes from tha 



Only a frag;ment of the anterior region of the body is 

 present, comprising 17 or 18 liristlcd segments. It tapers a 

 little anteriorly j>nd is somewhat flattened both dorsally an d 

 ventrally, though the first part of the ventral surface i s 

 rounded, and a streak runs along the median line. Th e 

 ■whole anterior region diverges from that of Prionospio. 



Behind the bilobcd dorsal papilla is a segment devoid of 

 bristles, unless it is to be regarded as only an extension of 

 the peristomium. Anteriorly it bears the bilobed papilla 

 and the projection on the leftside. It is followed by a region 

 provided with 6 or 7 prominent lamellae which partly overlap 

 the dorsum, and from the narrowness of the region in front 

 the first two or three approach each other more closely than 

 those which succeed. 



The first foot carries a broadly lanceolate dor.^al lobe and 

 a more pointed ventral lobe, the former overlapping the 

 lateral region of the dorsum and the latter directed oblicjucly 

 upwaid. The bristles of the dorsal division are curved back- 

 ward, taper to a fine point, and the upper series is larger, as 

 usual in the group. The ventral bristles have a similar 

 structure, but are shorter. 



The lamellae reach their maximum about tlie 4th or oth 

 foot, projecting above the dorsum as large broadly lanceolate 

 flaps. Moreover, the 4th foot bears a plumose brancliia 

 (PI. VI. figs. 6 & 7) somewhat like a sea-pen. The base is 

 smooth or slightly crenate, then the pin me appear and con- 

 tinue to the lanceolate apex, towards which they slightly 

 diminish in size. As mounted, the broadest part of the 

 organ is a little below the tip. The superior lamella is 

 almost like that in Phyllodoce, overhanging the 5th as a 

 broadly lanceolate leaf, and with the row of yellow bristh-s 

 in front of it. The ventral lamella is smaller and somewhat 

 conical. 



No other branchia occurred in the example, but as the 

 specimen is fragmentary the exact distribution of these 

 organs is unknown. The absence of the long terminal 

 filament so characteristic of Prionospio is noteworthy and 

 does not appear to be due to any injury to the organ. 



At the 10th foot (PI. YI. fig'. 8) the lamella has become 

 a naiTow rim with a bluntly conical free apex, and the 

 bristles are shorter. The ventral lamella is narrow and 

 short, rounded superiorly and inferiorly. One of the ventral 

 rows of bristles is much more slender than the other, with 

 very fine capillary tips. The bristles of the stronger row are 

 broken^ so that whether these have winged hooks is uncertain ; 



