REPORT ON THE CEPHALOPODA. 127 



behind ; tliey extend to within 1 mm. of the anterior margin, but are separated by 

 about 5 mm. posteriorly : the mantle-margin projects far over the head dorsally, and is 

 slightly emarginate ventrally. The siphon is conical, reaching two -thirds up to the gap 

 between the ventral arms. 



Tlie Head is short and broad ; the eyes prominent. 



The Arms are subequal, their order of length being *4, 3, 1, 2 ; they are about one- 

 fourth as long as the body and taper to fine points : the dorsal are conical with a very 

 slight ridge up the outer aspect, the third pair have a similar ridge ; the ventral are 

 flattened and bear a distinct crest. The suckers (figs. 19, 20) are in four series 

 throughout and of moderate size, set obliquely on short peduncles, with meridional 

 grooves on the outside : the horny ring bears twenty to twenty-five long, square-cut, 

 irregular teeth on its distal semicircumference (fig. 20), and outside it is an area covered 

 with closely set papdlse. The hectocotylus was not observed, both the specimens being 

 females. The umbrella is slight, reaching only as high as the sixth row of suckers 

 between the third and fourth arms, where it is widest ; as usual it is entirely absent 

 between the two ventral arms. The buccal tnembrane has the usual seven points. 

 The spermatic jmd is not developed ; the outer lip is smooth, except for a few ridges 

 due to contraction ; the inner bears numerous small papillae. 



The Tentacles are about as long as the body, the stem being three-sided : the club 

 is short, flattened, and expanded, with a protective membrane on either side and a 

 broad web down the back, reaching along the stem for a distance equal to half the 

 length of the club (fig. 15); it bears six larger suchers in the central row, a series of 

 smaller ones on either side, and some very minute ones along each margin : at 

 the top are fifteen to twenty in four series. The horny ring of the large suckers 

 has twenty -five to thirty teeth in its distal semicircle (fig. 18); those of the smaller 

 about ten. 



Tlie Surface is smooth, except for a few irregular inconstant papiUse on one side of 

 the ventral surface and below the eye. 



TJie Colour is a pale yeUowish-grey, darker above. 



Tlie Jaws are shown in figs. 16, 17. 



The Shell (figs. 21, 22, 23) is oval in outline, broadest anteriorly to the middle, 

 tapering somewhat rapidly and ending in a semicircle in front ; posteriorly it tapers 

 gently, and, then rounding off, ends in two almost straight lines, which meet at a right 

 angle at the base of the spine. The chitinous margin is but slightly uncovered on the 

 dorsal surface, which shows two grooves diverging as they pass forwards, separating 

 three ribs, and is covered with rounded papillae arranged in curves parallel to the ' 

 anterior margin. The ventral surface has a rather deep and broad median groove: 

 the last loculus has an index of 34, and is bounded posteriorly by a wavy line with 

 three curves ; the striated area is hollowed, so that this part of the shell is thin; the 



