SYLLIS CITXMNGHAMI. 195 



articulated. Eyes four, dark red, arranged nearly in a rectangle, though the anterior pair 

 are wider apart. 



Body about half an inch in length, of a dull orange-yellow colour, paler in front 

 and at the tail, which has a pair of cirri. The segments are about 100. 



Foot (Plate LXX, fig. 18) with a long, tapering, smooth, dorsal cirrus. The seti- 

 gerous region is conical, the inferior slope trending away more rapidly than the superior. 

 The spines, which pierce the upper angle, often have a blunt curved tip. The trans- 

 lucent bristles (Plate LXXIX, figs. 13 and 13 a) have a very short terminal piece with a 

 well-marked hook at the apex, whilst the abbreviated edge shows no traces of spikes. 

 These terminal pieces do not vary to the same degree as, for instance, in Syllis armillaris. 

 The dilated distal region of the shaft is short with indications of serrations on the 

 bevelled edge. The ventral cirrus is large, broadly ovate, and does not reach the tip of 

 the setigerous region. 



The long simple (swimming-) bristles are developed in the posterior region of one 

 from Lochmaddy, indicating the formation of a bud with the reproductive elements. 



In transverse section the ventral longitudinal muscles are separated by the nerve- 

 cords, which are comparatively large and have the basement-tissue, hypoderm, and cuticle 

 externally. 



This form seems to agree with Grube's description in regard to the arrangement of 

 the eyes and the form of the head, but the palpi were not connate. The author points out 

 the shortness of the terminal pieces of the bristles, which he describes as almost equilateral, 

 and the absence of articulations in the cirri, thus differing from all except Syllis longo- 

 cirratus, in which, however, the tip is dilated. His example came from St. Croix, 

 Ohristiansted. 



5. Syllis Cunningham!, 1 n. s. Plate LXX, fig. 19 and 19a — foot; Plate LXXXIY, 



fig. 6 — bristle. 



Specific Characters. — Head apparently typical, though eyes not seen. Tentacles and 

 cirri articulated. Body normal. Attached posteriorly was a male bud considerably larger 

 in diameter than the parent-stock. Foot anteriorly has a somewhat stout tapered cirrus 

 of about seventeen segments. Setigerous region rather narrow and elongate when seen 

 from above ; obliquely conical in lateral view. Xext the spines are two bristles larger 

 than the others and apparently devoid of terminal pieces. The smaller bristles beneath 

 are of average size, and have short terminal pieces — spinous on the edge and with a 

 simple hook at the end. The ventral cirrus is narrow and elongate, but does not reach 

 the tip of the setigerous region. 



Habitat. — In the tracks of Spio in fissures of the hard rocks between tide-marks. 

 Cobo Bay, Guernsey, 1868. 



Head apparently typical, but the eyes had disappeared before it was critically 

 examined. The tentacles and tentacular cirri are of average length and articulated. 



Body about three quarters of an inch in length and normal. The posterior region 

 1 Xamed in honour of my late valued and eloquent colleague. Principal John Cunningham, of St. 

 MaiVs College, St. Andrews. 



