194 SYLLIS MACEOCEBAS. 



region of considerable extent marked by brownish pinnae from the intestine, and speckled 

 with white. 



The bud had a salmon-tint and was full of ova, and next day it became detached. It 

 is wider than its nurse-stock, has a small head with four large red eyes, only two of which, 

 however, are visible from the dorsum, though seen when the head is viewed obliquely. 

 They subserve ventral vision. The cirri of the bud are nearly equal. 



Habits. — The species is hardy. The specimen captured in August at Paible was 

 carried to Lochmaddy, and after a few days across the Minch to Dunvegan, and thence to 

 Murthly, where it was figured by my sister. It lived for five months in confinement fifty 

 miles from the sea, in a tumbler of sea- water, the only change being an increase in 

 translucency and a diminution in the size of the cirri. The sea-water was rarely changed. 



When placed in a flat vessel it generally makes for the side, where it remains 

 quiescent. It sometimes coils both larger and smaller cirri upward in repose, but 

 generally the smaller remain extended transversely. It is fond of twisting itself and 

 turning over and over, and occasionally coils itself into a ball, ventral surface outwards. 

 The movements of the cirri are many and graceful, and render the species one of the 

 most beautiful of the British Syllicls. 



4. Syllis macroceras, Orube, 1857. Plate LXX, fig. 18— foot; Plate LXXIX, fig. 13 and 



13 a — bristles. 



Specific Characters. — Head about as long as broad, with two long palpi. 1 Eyes four, 

 dark reel, arranged nearly in a rectangle, though the anterior pair are wider apart. 

 Median tentacle longer than the lateral, but shorter than the third from the front. These 

 processes are not articulated. Body about half an inch in length, and with 100 segments. 

 Colour dull orange, paler in front and at the tail which has a pair of cirri. Foot with a 

 long, tapering, smooth dorsal cirrus ; the setigerous region is conical, but the inferior 

 slope trends away more rapidly than the superior. Spines with a blunt, curved tip. 

 Bristles translucent, little modified in each group, with a short terminal piece which shows 

 a well-marked hook at the tip and no trace of spines. The dilated distal region of the 

 shaft is short and has indications of serrations on the bevelled edge. Ventral cirrus large, 

 broadly ovate, and does not reach the tip of the setigerous region. 



Synonyms. 

 1857. Syllis macroceras, Grube. Annul. (Ersted (Nat. Foren. Vidensk. Meddel.)., iii, p. 28. 

 1865. „ „ De Quatrefages. Anneles, II, p. 28. 



1869. „ macrocera, Mcintosh. Trans. R. S. Edin., xxv ; p. 416, pi. xv, f. 12. 



Habitat. — Procured under a stone near low water-mark, Lochmaddy, North Uist; 

 in the Grouliot Caves, Sark, under stones ; and in the tidal region at Whitecliff Bay, Isle 

 of Wight. 



A widely distributed form — ranging to St. Croix, Christiansted (Grube). 



Head about as long as broad, with two long palpi in front. Median tentacle longer 

 than the two lateral, but shorter than the third from the front. These organs are not 



1 Grube states that they are connate to the middle, but they were not so in these examples. 



