STAUROCEPHALTTS CILIATUS. 359 



segment on eacli side of the intestine. The first two segments are devoid of feet, and in 

 the preparation the anterior seems to be the broader. 



The proboscis is armed with a double row of teeth as in Staurocephalus rubrovittatus, 

 but from the diminished size of the animal they are proportionally smaller. The lower 

 and inner row consists of dark brown strongly curved teeth with a median and one or two 

 lateral points, with the basal wings for support. Each terminates inferiorly in a long 

 process, which has alternately large and small teeth. The outer and upper row consists 

 of amber-coloured teeth of similar but more slender form and terminating inferiorly in a 

 similar process with smaller sharp teeth alternately larger and smaller. Towards the 

 lower end more than one small tooth intervenes between the larger. 



The mandibles are clavate and of a brownish-black colour. The free edge is coarsely 

 denticulated (Plate LXT, fig. 8), about five teeth occupying the edge, the last or outer 

 with an accessory process. 



The anterior feet are smaller and somewhat rudimentary, but when fully developed 

 (Plate LXXIII, fig- 5) have a stout form, and a somewhat ovate or ovato-lanceolate 

 dorsal lobe narrowed at its attachment and projecting above the large setigerous region. 

 This has superiorly a single pale spine, the point of which just touches the surface. 

 Above the spine are one or two stout, straight, translucent bristles, the shaft of which 

 dilates and is bifid at the end (Plate LXXXI, fig. 10), the longer limb of the fork slightly 

 flattened and with a claw at the tip. The other is simply pointed. Below these are 

 one or two slender bristles with straight shafts and finely tapered tips which are 

 definitely curved and finely serrated from a little below the bend — upward along the 

 tip on the convex side of the curve — which is usually directed dorsally (Plate LXXXI, 

 fig. 10 a). The bristles beneath the spine are generally five or six in number, translucent 

 with curved shafts, dilated at the end, and with a few serrations (the convexity being 

 directed dorsally), and terminal pieces which form a diminishing series from above down- 

 ward, the upper being the longest and the lower the shortest (Plate LXXXI, fig. 10/)). 

 The tip of the terminal piece, at first thought to have a simple hook, is really bifid, for 

 close to the terminal hook a minute secondary process is present. The setigerous region 

 is produced outward inferiorly into a prominent papilla at the origin of the inferior 

 bristles. The terminal pieces do not show serrations on the edge in the preparations, but 

 they may have had them when fresh. The ventral lobe arises nearer the body than the 

 dorsal, but has a similar shape, the base being narrowed at its attachment to the foot. 



The example from which the drawings were made was a female with small eggs 

 showing nucleus and nucleolus in August. 



Habits. — They often twist themselves into a circular ball, crawl about frequently on 

 their sides with a wriggling motion, and can also swim in a similar manner. They are 

 on the whole active and lively. 



3. Staurocephalus ctliatus var. Pobertian/e. Plate LXI, figs. 9 and 9 a — teeth; Plate 

 LXXIII, fig. 6— foot; Plate LXXXI, figs. 11-11 6— bristles. 

 Specific Characters. — Head flattened and tapered anteriorly to a blunt snout. Eyes 

 two, large, black. Palpi arising laterally in front of the eyes and having a terminal arti- 



