338 PSEUDOCLYMENE (ERSTEDI. 



The bristles consist of stronger forms with straight shafts, tapered tips, and distinct 

 wings (Plate CVIII, fig. 10), the wing running distally into a peculiar, flattened region, 

 which ends in the tapered tip, but no serration could be made out. The delicate, slender 

 forms taper to a hair-like tip, but spikes could not be seen in the preparation. 



The first seven segments and the anterior part of the eighth are markedly glandular, 

 all having prominent belts in front, and the ventral streak is distinct from the mouth 

 backward. The first three segments bear strong spines with curvatures of both shaft and 

 tip (Plate CIX, fig. 5), the tip of the spine of the third segment being most distinctly 

 hooked. The fourth has a row of hooks with long, curved shafts, the main fang makes a 

 larger angle with the neck than in the typical form, and the gular bristles seem to be 

 rudimentary, yet the hook has much of the character of the type. The hook, as at the 

 eighth segment (Plate CVIII, fig. 10 a), is distinguished by the great breadth of the distal 

 end, the large angle made by the main fang with the neck, the close application of the 

 gular bristles to the lower border of the fang — apparently almost springing from the 

 basal edge of the fang itself — and the numerous and small teeth on the crown behind it ; 

 yet the crown is rounded off instead of being high. The shaft is of moderate length, 

 striated longitudinally, gently curved, and the slope from the slight shoulder to the neck 

 is gradual, then the neck dilates in its progress distally, and is boldly and obliquely 

 striated. 



2. Pseudoclymene (Erstedi, Claparede, 1863. Plate 0, figs. 22 and 22 a— head; Plate 

 CVIII, figs. 12—12 c— bristles and hook ; Plate CI, fig. 9— tail. 

 Specific Characters. — Cephalic plate elongated antero-posteriorly so as to be elliptical, 

 the narrow anterior end being continuous with the median frontal process. The rim is 

 not much developed, and the lateral notches and the posterior notch are slightly marked. 

 Keel long, commencing a little in front of the posterior rim and passing forward to the 

 base of the median process, on each side of which the long nuchal grooves end. Eyes 

 present. Proboscis smooth. Body comparatively small, of twenty segments (De St. 

 Joseph). First seven segments shorter and the feet are in front of the centre of each, 

 whereas those behind have the feet toward the posterior border. Four unarmed segments 

 posteriorly, viz. a short, urn-shaped segment, with glandular ridges, and three closely 

 aggregated rings, two of which have glandular thickenings. A ventral median ridge 

 extends nearly from end to end, and it abuts on the longest anal cirrus, which is flattened 

 and not much tapered. The long and the short cirri are arranged more or less alternately, 

 one or two short occurring between the long. Anal cone flattened. First three segments 

 are spinigerous, though occasionally one side of the second and third bear modified and 

 large hooks. Bristles of two kinds : stiffer straight forms with tapered tips and distinct 

 wings, and slender, translucent bristles with long, hair-like tips, which are probably 

 minutely spinous. Typical hook with curved shaft, which is tapered from the shoulder to 

 the base, whilst the neck is narrow inferiorly (above the shoulder) and dilates distally, 

 the main fang leaving the neck at less than a right angle, and behind it is a very high 

 crown with five to six teeth. Almost immediately beneath the great fang is a tuft of 

 gular bristles, which pass forward and curve above the tip of the main fang. Colour clear 

 brown, with red bands on anterior segments (De St. Joseph). Tubes small, free and 



