LINEUS MAKINUS. 183 



1866. Borlasia gracilis, Ibid. Op. cit., p. 389. 

 „ „ lineatus, Ibid. Op, cit., p. 389. 



1867. „ longissimus, Parfitt. Catal. Annel. Devon, p. 8. 

 „ „ lineatus, Ibid. Op. cit., p. 8. 



1868. „ longissimus, Mcintosh. Ann. Nat. Hist., 4th ser., vol. ii, p. 293. 

 ,, j, „ Ibid. Proceed. Linn. Soc, vol. x, p. 251. 



„ „ „ Ibid. Rept. Brit. Assoc, 1868, p. 340. 



1869. „ „ Ibid. Trans. Roy. Soc. Edinb., vol. xxv, pt. ii, p. 374 et seq. 



Habitat. — Not uncommon under stones between tide-marks, either in or out of tidal pools, 

 in fissures of rocks, amidst tangle-roots in the laminarian zone, and occasionally in deep water. 



Body, — Fifteen to thirty feet to as many yards in length, and from one to four lines in 

 breadth, rather rounded, slightly narrowed behind the head, continuing of nearly equal calibre 

 throughout the greater part, and then gradually narrowing towards the tail. 



Colour. — Blackish- brown, relieved throughout by the fine purplish iridescence of the 

 cilia. The tip of the snout is pale or whitish, and there are three pale bands from this 

 region backwards. The central passes along the body a considerable distance, but gradually 

 becomes indistinct, and the two lateral, which follow a similar course on the dorsum, vanish 

 sooner. In addition to the foregoing, a very distinct pale stripe commences on each side at the 

 posterior part of the cephalic fissure, and courses along the infero-lateral region of the body to the 

 tip of the tail Another well-marked stripe commences on the ventral surface at the centre of 

 the snout, and continues along the middle nearly to the termination of the body. There is not 

 much difference in colour between the dorsal and ventral surfaces. In young examples the brown 

 is much paler, assuming an olive-brown or olive hue, and the stripes are more numerous and 

 conspicuous; indeed, there is considerable variety in this respect. Generally, a reddish coloration 

 is observed on both surfaces in the ganglionic region. The stripes exist on many good spirit- 

 preparations, those on the head being especially distinct, and the slight eversion of the mouth 

 causes a pale margin (or lip) all round. In dark specimens the lateral lines of the body are the 

 most conspicuous. The rich dark colour of many shows that they are not unused to light in their 

 native haunts. 



Head. — Wider than the succeeding portion of the body, narrowed towards the anterior and 

 posterior borders. The tip of the snout is generally bilobed, with a distinct papilla in the centre 

 and two small ones on each lateral eminence. On each side is a deep lateral fissure with 

 large lips, the superior being often rolled or curved inwards. The fissures have the usual 

 reddish hue posteriorly. There is a dense group of eyes on each side of the anterior margin of the 

 snout, arranged in a longitudinal manner, or rather their outline forms a long wedge — narrow 

 anteriorly and wide posteriorly. In very dark examples these eyes are not easily seen, indeed 

 they have escaped the notice of many observers ; but if the animals are kept in confinement a 

 long time, the bleaching of the snout renders them conspicuous, as may be noticed by contrast- 

 ing the large coloured figure in Plate IX with Plate XVIII, fig. 1, which (latter) represents the 

 head of the same specimen upwards of a year after its capture. In young animals the eyes are 

 easily seen from the dorsum. 



This is unquestionably the giant of the race, and even now I am not quite satisfied about the 

 limit of its growth, for after a severe storm in the spring of 1864 a specimen was thrown on shore 

 at St. Andrews which half filled a dissecting jar eight inches wide and five inches deep. Thirty 



