ELIOT : NUDIBUANCHS OF FALKLAND ISLANDS. 357 



preserved about 19 mm. long, 18 high, and 16 broad, but is bent and 

 was probably considerably longer in life. 



The dome of the back is purplish grey with traces of yellow on the 

 tubercles. There are also traces of bright yellow near the rhinophores, 

 on the branchiae, and on the foot. The back is covered with round, 

 flattish tubercles, the largest 3 mm. wide, but most not more than 

 a third of that size. About 12 of the largest are disposed in an 

 irregular series so as to form three not very clear lines. In the 

 intervals between them are smaller tubercles which become still 

 smaller and more crowded near the edges of the mantle. 



The tentacles are flat. The margin of the foot is grooved, but not 

 notched. Round each of the rhinophorial openings are set about seven 

 tubercles, but they are not differentiated from the others on the dorsal 

 surface. The rhinophores are yellow and bear about 15 perfoliations. 

 The margin of the branchial pocket is marked by a line of incon- 

 spicuous tubercles. They resemble those of the rhinophores and dorsal 

 surface generally, and do not look as if they could in any circumstances 

 close over the pocket, which is of an unusual construction. It is very 

 shallow, especially behind and. at the sides ; a little, but not much 

 deeper in front. It can hardly be doubted that the animal is a crypto- 

 branchiate Dorid, but the pocket, as preserved, is merely a special 

 area a little lower than the dorsal surface. A somewhat similar 

 phenomenon is seen in several species of Boridoims. The branchiae 

 consist of 12-13 small bright-yellow plumes, mostly bipinnate, but 

 some simply pinnate. 



The main colour of the intestines is a bright deep purple. The 

 central nervous system lies far forward, but the position is perhaps not 

 natural. The three pairs of ganglia are distinct ; the pleural portion 

 of the cerebro-pleural ganglia rather large ; the eyes sessile. 



The labial cuticle is strong and brown, but without armature. The 

 radula is rather small, consisting of 25 rows with a formula of 24 . . 24. 

 The teeth are colourless, simply hamate, small inside, and increasing 

 up to the middle of the row. The outermost shorter, but not much 

 degraded, and not denticulate. The oesophagus is long and describes 

 a complete circle behind the buccal mass. The stomach lies in the 

 anterior cleft of the liver. Its upper wall is much laminated internally ; 

 the intestine is long. The gall-bladder is purple, and so is the liver 

 both within and without, but in places the colour is somewhat dimmed 

 by the sparse, greenish hermaphrodite gland. 



The genitalia are also purplish. The duct of the hermaphrodite 

 gland is rather long. The mucus and albumen glands are not large. 

 The spermatotheca is purple, large, and globular, but the spermatocyst 

 rises so close to it as almost to form a swelling on its side. The duct 

 dilates, and the two receptacles rise together. Something similar is 

 seen in Bergh's figures of M. Januarii (in Semper's Eeisen, Supp. ii, 

 pi. c, tig. 23). The vas deferens is tough and strong. No prostate 

 was found and no armature. 



This form also resembles St. Januarii (which is probably a variety 

 of 8t. verrucosa) in its yellowish colour and red intestines, but the 

 arrangement of tubercles round the branchiae and rhinophores is 



VOL. Vn.— SEPTEMBER, 1907. 25 



