ELIOT : NUDIBKANCHS OF FALKLAND ISLANDS. 355 



distorted, but the real shape is probably linguiform with a tail, and 

 the largest, if straightened out, would be about 45 mm. long and 1 7 wide. 

 As preserved, some are white and some are green ; the back is covered 

 with low soft warts, which are clearest near the tail. The rhinophore 

 sheaths are of moderate size, reflexed and not digitate. The frontal 

 veil bears 10-15 processes. On either side of the body is a continuous 

 row of 16-19 small branchial tufts, but the number is not always 

 identical on the two sides. The tufts consist of 2-3 main stems 

 bearing secondary branches, with small tertiary branches here and 

 there. The jaws are olive-green, with 7-8 rows of very distinct 

 denticles. The radula examined consisted of 42 rows with a maximum 

 formula of 454-1 + 1 + 1+45. The median teeth are tricuspid 

 and hollowed out behind, the first lateral stout and rather clumsy, 

 the rest rather elongate and curved near the tips. 



DiAULULA VESTiTA (Abraham). 

 Boris vestita, Abraham: Proc. Zool. Soc, p. 252, pi. xxviii, figs. 5, 6, 

 1877. = Diaulula Sandiecfcnsis, \ax. pallida, Eergh : liull. of 

 Mus. of Comp. Zool. Harvard, p. 172, 1894. 



I have examined two specimens of this form, one obtained by 

 Mr. Valentine in the Falkland Islands and one from the Straits of 

 Magellan, preserved in the British Museum and described by Abraham 

 as Boris vestita. The specimens agree in both external and internal 

 features, but the intestines are somewhat decayed in both. 



The larger (Mr. Valentine's) is 45 mm. loug, 22 broad, and 18 high, 

 but the real breadth was probably much greater, as the ample mantle- 

 edge, (9 mm. broad in some places) is turned inwards. In both 

 specimens there are rents in the mantle which make it probable that 

 autotomy was commencing when the animals died. The texture is 

 spiculous, much harder and rougher in one specimen than the other. 

 The colour is whitish with here and there a yellowish tinge. 



There is no trace of a dorsal ridge or keel, but the back is covered 

 with small, flat-topped tubercles of various sizes, the largest not more 

 than -75 mm. high and -5 mm. broad. They are full of spicules, about 

 seven of which project from the top of each and form a sort of crown. 

 These spicules, which are also found in great quantities in the rest of 

 the integuments, are long, colourless, slender, and fairly straight, not 

 branched or swollen. The rhinophorial pockets are closed, but appear 

 to have been protected by rather high sheaths with denticulate 

 edges. The margin of the branchial pocket shows indistinct undulations 

 or jags, five in one specimen, nine in the other. The branchiae are 

 much contracted, short, stout, and bi- or tripinnate. They may be 

 counted as either nine or five, according as the smaller plumes are 

 reckoned as independent or as subdivisions. The foot is grooved and 

 notched in front. The tentacles are small and digitate. 



The intestines are yellowish. On the labial cuticle is a collection of 

 granules forming a grey strip, which has not, however, in either 

 specimen the usual appearance of a labial armature, and does not 

 contain rods or hooks. The radula is small, consisting of 20 and 

 22 rows, which contain respectively 31 and 26 yellowish teeth on 



