of Edinburgh, Sessio?i 1884-85. 
295 
the smallest and subcorneal, the ventral wide and with a narrow 
web on the outer aspect ; they all taper gradually to fine points. 
The suckers are in four series throughout, pedunculate, oblique, and 
notched proximally and distally, and with meridional grooves on 
the margin ; the horny ring has about twenty blunt triangular teeth on 
the distal semicircumference, and is surrounded by a broad papillate 
area. The hectocotylus is not present. The umbrella is but slightly 
developed, reaching in its greatest extent (between the third and 
fourth arms) only to the fourth row of suckers. The buccal membrane 
has the usual seven points, but there is no spermatic cushion. The 
outer lip) is moderately thick and longitudinally ribbed ; the inner 
is provided with many rows of elevated rounded papillae. 
The Tentacles are about as long as the mantle, and have stout 
three-sided stems ; the club occupies about one-fourth of the whole 
length, and extends fully half round the stem; a protective 
membrane is found at either side of the suckers and a web along 
the dorso-median aspect of the club. The suckers are very numerous, 
minute and closely packed ; the horny ring has about eight or ten 
stout distant teeth on the distal margin. 
The Surface is for the most part smooth, but there are about five 
elongated elevations down each side of the body near the origin 'of 
the fin, and a few minute papillse on the dorsal surface. 
The Colour is a dull purplish grey above, pale ochre below. 
The Shell is roughly elliptical in outline ; the anterior extremity 
is bounded by two straight lines forming a blunt rounded angle ; 
the sides curve evenly outwards (the greatest breadth being a little 
anterior to the middle) and form a bluntish point behind. The 
chitinous margin is narrow and vanishes in the median ventral line 
behind. The dorsal surface is rough, with granules arranged in rows 
parallel to the anterior margin ; three slightly elevated tracts diverge 
from the spine to the three anterior angles. The ventral surface is 
little elevated ; the last loculus occupies one fourth of the length, 
and is emarginate, being bounded behind by a more or less evenly 
curved line ; the striated area is excavated, so that the whole shell 
is thin ; the inner cone is well developed, with a thickened rounded 
margin, and encloses a deep pit ; the limbs extend half-way along 
the striated area. The spine is long, tapering, and curves gently 
upwards. 
