REPORT ON THE CEPHALOPODA. 125 



Tlie Body is of medium breadth, widest one-third back, curving evenly to a pointed 

 posterior extremity. The fin is nearly one-third the breadth of the body, extending 

 from the anterior margin of the mantle to within 4 mm. of its fellow at the posterior 

 extremity. The mantle-margin projects to a considerable extent over the head 

 dorsally, and is slightly emarginate ventrally. The siphon is long, reaching up to the 

 interspace between the ventral arms. 



The Head is of medium breadth and the eyes promment. 



Tlie Arms are subequal, their order of length being 4, 3, 2, 1 ; they are a little 

 more than half as long as the body ; the dorsal are the smallest and subconical, the 

 ventral wide and with a narrow web on the outer aspect ; they all taper gradually to 

 fine points. The suckers (figs. 6, 7) are in four series throughout, pedunculate, 

 oblique, notched proximally and distaUy, and with meridional grooves on the 

 margin ; the horny ring has about twenty blunt triangular teeth on the distal semi- 

 circumference, and is surrounded by a broad papillary area (fig. 7). The hectocotylus 

 was not observed, all the specimens being females. The umhrella 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 pad. The outer lip is moderately thick and longitudinally 

 ribbed ; the inner is provided with many rows of elevated rounded papillae. 



Tlie Tentacles are about as long as the mantle, and have stout three-sided stems ; 

 the clitb occupies about one-fourth of the whole length, and extends fully half round 

 the stem (fig, 3); a protective membrane is found at either side of the suckers and a 

 web along the dorso-median aspect of the club (fig. 4). The suckers are very numerous, 

 minute, and closely packed ; the horny ring has about eight or ten stout distant teeth 

 on the distal margin (fig. 8). 



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 

 papillag on the dorsal surface. 



Tlie Colour is a dull purplish-grey above, pale ochre below. 



The Shell is roughly elliptical in outline (figs. 10, 11, 12) ; the anterior extremity 

 is bounded by two nearly 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 (fig. 12). The ventral surface is little elevated; the last 

 locidus has an index of 29-5, and is emarginate behind, being bounded 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 



