SPH^POSYLLIS HYSTBIX. 157 



base and tapering gradually towards the tip. A tentacular cirrus on each side. Body 

 rather less than a quarter of an inch in length, tapered anteriorly. Segments thirty-two. 

 About ten segments in front free from eggs, then a double series of pale rose-pink eggs 

 follows. Proboscis has lateral glands and a tooth in front. Proventriculus with twelve 

 rows of points (De St. Joseph). Foot has a small superior cirrus much enlarged (almost 

 globular) at the base and marked by minute and scattered tubercles. Setigerous region 

 with a fevy long papillge, two of which near the apex appear to be regular — viz. one 

 pointing forward and the other backward. The falciform bristles bear a somewhat 

 elongated terminal piece ending in a simple claw. A single simple bristle slightly 

 curved toward the tip occurs amongst them, and from the ninth segment to the tail a 

 tuft of long swimming-bristles. From the fifth segment there is a capsule with 

 rhabdites in each foot ventrally. 



Synonyms. 



1868. Sphzerosyllis hystrix, Claparede. Beobach, p. 45, Taf. xiii, f. 36 and 37. 



1864. „ }i idem. Gllanures, p. 86, pi. vi, f. 1. 



1865. „ }} De Quatrefages. Aimel., ii, pp. 52 and 646. 



1869. „ „ Mcintosh. Trans. R. S. Edin., t. xxv, p. 416, pi. xv, f. 10; pi. xvi, 



f. 9. 



1874. „ „ Marenzeller. Sitzb. Wien., p. 25 (Adriat. Annel.). 



1875. „ „ Marion and Bobretzky. Annel. Marseil., p. 44; Ann. Sc. Nat., 6 e ser., 



t. ii, p. 44. 

 1879. „ ,, Langerhans. Zeitsch. f. w. Zool., t. xxxii, p. 567. 



„ „ „ Tauber. Annul. Danic, p. 95. 



1884. „ „ Yiguier. Arch. Zool. Exper., 2 e ser., t. ii, p. 98. 



1885. „ „ Cams. Fauna Medit., p. 233. 



1887. „ „ De St. Joseph. Ann. Sc. Nat., 7 e ser., t. i, p. 204, pi. x, f. 79, 80. 



Habitat. — Under a stone, near low water, Lochmaddy, August, 1865. In the tow- 

 net, off County Down, Ireland, August, 1902 (Professor Gr. S. Brady). 



Dinard, France (De St. Joseph), Madeira (Langerhans), Mediterranean, Atlantic, 

 and North Sea. 



Head (Plate LIX, figs. 4 a and 8) with the palpi fused, except at the tip ; two lateral 

 tentacles, much enlarged at the base and tapering gradually towards the tip. Their 

 surface is somewhat rough. A median tentacle, rather larger, but of similar shape, 

 arises just in front of the eyes (fig. 4 a). Eyes four, red, the anterior pair furnished 

 with lenses. In an example from the Minch there were six eyes — two larger posteriorly, 

 quite separated from each other, and two small round ones in front. De St. Joseph 

 found the head (peau) covered with papillaa and incrusted with muddy particles. 



Body pale, nearly translucent, marked by a central moniliform yellow band, rather 

 less than a quarter of an inch long, and tapered anteriorly to the small snout. Segments 

 19 — 32 (30 — 38, De St. Joseph). The tail has two swollen cirri. 



