68 AMPHARETE ACUTIFRONS. 



conditions being clearly shown in Fauvel's figures. 1 Some preparations thus indicate 

 an outer and an inner folded collar. 



The second segment is short and devoid of processes. The third bears dorsally the 

 fan of flattened paleae, and, with the next segment, the four branchiae on each side 

 (Fauvel). The paleae form a more or less horizontal fan, with the longer bristles internal, 

 the shorter external. Bach of the larger paleae (Plate CXXIV, fig. 4) has a flattened 

 finely striated shaft and a tapered tip with a granular interior, and a slender curved tip 

 ending in a fine point, the same minutely granular aspect being present in it as in the 

 region below. The concave edge of the distal curve is crenulated, after the manner of 

 similar structures in the Amphictenidae. 



The body (Plate OXII, fig. 3) reaches nearly an inch in length in spirit, and is 

 slightly tapered anteriorly, the bristled region of fourteen segments beiug narrowed both 

 anteriorly and posteriorly, and terminating in the narrower uncinigerous region of twelve 

 segments, the caudal extremity having a series of slender filiform cirri. Generally 

 speaking the segments of the anterior region are narrow, those of the posterior region 

 are wider. The terminal segment is comparatively small, and the filiform tapering 

 cirri, which Malmgren says are twenty in number, seem to surround the vent. The 

 body is somewhat smoothly rounded dorsally, flattened and marked by a median band 

 ventrally. 



The branchiae are smooth, or slightly crenulate, tapering organs of a greenish hue 

 which arise, three in a transverse row on the third segment, and the fourth behind the 

 middle one of the row. 



The anterior region is distinguished by the ventral glandular belts, and by the 

 presence of fourteen setigerous processes and fourteen lamellae for the hooks. Whilst two 

 or three of the anterior setigerous processes are smaller, the typical process is somewhat 

 flattened and carries the row of bristles more or less vertically, the longer and stronger 

 bristles being dorsal, the somewhat shorter ventral. Bach bristle has a bulb at its 

 origin, then the shaft dilates a little, remains of equal diameter for some distance 

 (Plate CXXIV, figs. 4, 4<z', 4b), then shows a slight curvature at the commencement of 

 the tip, which has wings and tapers to a hair-like point. About eight of the stronger 

 forms are present in each tuft, besides a series apparently of developing forms, the 

 slender tips of which project between the others at the level of the skin. A tendency of 

 the upper tips to bend downward and of the inferior upward is often apparent. 



The lamellae or ridges for the hooks lie ventralward of the bristles and anteriorly 

 form ridges with even margins, but by-and-by a papilla appears at the dorsal edge and 

 forms toward the end of the region a cirrus with a slender tapering extremity, not 

 shown by Fauvel. The anterior hooks (Plate CXXIV, fig. 4 c) differ from the outlines 

 of Fauvel, having a broader body, about six teeth, and a rounded prow of a different 

 curvature from that figured by the French author. 



The posterior region has twelve segments, and is distinguished by the absence of 

 bristles and the elongated nature of the lamellae for the hooks and of the cirrus, as well as 

 by the great antero-posterior diameter of the segments in relation to their transverse. 



1 Op. cit.j pi. xix, figs. 57 and 58. 



