^ Challenger^ Cephalopoda. 197 



more elevated posteriorly, where they bound a shallow depres- 

 sion : outside them the margin of the shell expands into a sub- 

 circular plate, from the centre of which the spine projects 

 backwards ; no information can be given as to its form or 

 length, as it has been broken off close to the base. 

 Hob. Kobi, Japan, 8 fathoms. One specimen, $ . 



Sepia papuensiSj n. sp. 



The Body is elongated, broadest about one third back, 

 pointed behind : the^ws extend the whole length of the body 

 and are one third of its breadth, a little wider behind ; they 

 extend to within 1 millim. of the anterior margin, but are 

 separated by about 5 millim . 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. 



The 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 

 are in four series throughout and of moderate size, set ob- 

 liquely on short peduncles, with meridional grooves on the 

 outside : the horny ring bears from twenty to twenty- five long, 

 square-cut, irregular teeth in its distal semicircumference, 

 and outside it is an area covered with close-set papillge. The 

 hectocotylus is not developed. 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 membrane has 

 the usual seven points. The spermatic cushion is not deve- 

 loped : the outer lip is smooth, except for a few ridges due to 

 contraction ; the inner lip bears numerous small papillop. 



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 ; it bears six larger suckers in the 

 central row, a series of smaller ones on either side, and some very 

 minute ones along each margin ; at the top are from fifteen to 

 twenty in four series. The horny ring of the large suckers 

 has from twenty-five to thirty teeth in its distal semicircle ; 

 those of the smaller about ten. 



The Surface is smooth, except for a fev/ irregular incon- 



