192 THE VOYAGE OF H.M.S. CHALLENGER. 



the arms; on the terminal fourth the suckers gradually diminish. The margin of the 

 larger suckers is almost entii-e but marked out into irregular very shallow, square-cut 

 teeth (figs. 2, 3) ; on the distal margins of the smaller suckers the teeth become more 

 prominent, but are blunt, and about eight to ten in number. 



The Tentacles (fig. 6) are but little longer than the arms, and only slightly expanded 

 at their extremities. On the inner side of the stem is a groove which bears two and 

 afterwards four irregular rows of very minute suckers (fig. 7), among which are a 

 number of fixing-cushions (fig. 10). On the cluh are four rows of suckers about as 

 large as the smaller ones on the arms ; their horny rings are provided on the proximal 

 semicircumference with about fifteen closely set subacute teeth, while the distal semi- 

 circumference bears about nine long very acute teeth (fig. 8, 9). 



Tlie Surface is smooth. 



The Colour is pale yellowish-grey ; a number of purplish chromatophores cover the 

 mantle, and there are also a number of larger spots disposed in irregular rows, of which 

 there are about ten down the mantle. 



The Gladius (fig. 11) is long, narrow anteriorly, expanded in the posterior half, and 

 forming a hollow terminal cone enclosing part of the genital gland. 



Taonhis suhmi (Lankester), Hoyle (PL XXXII. figs. 5—11). 



1884. Procalistes Suhmii, Lankester, Quart. Journ. Micr. Sci., JST.S., vol. xxiv. p. 311, figs. 1, 2. 



1885. Taonius suhmii, Hoyle, in ISTarr. Claall. Exp., p. 472, figs. 173, 174. 



Habitat. — Station 159 ; Southern Ocean due south of Australia, March 10, 1874 ; 

 lat. 47° 25' S., long. 130° 22' E. ; 2150 fathoms. Surface (?) Two specimens. 



Between Sydney and Wellington, June 16—17, 1874. Three young specimens 

 mounted as microscopic objects, and one preserved in spirit. Surface. 



North Atlantic, ofi" the coast of Africa, April 13, 1876. Surface. One small specimen. 



The Body is elongated and fusiform, broadest about one-third back, narrowing 

 gradually forwards and tapering to an acuminate point behind. The Jin is small, about 

 one-eighth the length of the body, and cordate in form. The mantle-margin is directly 

 transverse, and forms three watch-pocket-like openings between its dorsal and lateral 

 attachments, and at each of the latter of these is an oblong semitransparent piece of 

 cartilage -like material. The si2^ho?i is long, reaching as far as the bases of the arms, 

 and tapering ; it opens anteriorly by a transverse slit. 



The Head is small and subquadrate, its anterior end being entirely occupied by 

 the bases of the arms, and the hinder portion of its sides by the large pedunci;late 

 eyes (fig. 5). 



The Arms are unequal, the order of length being 4, 3, 2, 1, and on an average 



