BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
3. Stauroteuthis hippoorepium, sp. n. 
(Plate 1, Fig. 1; Plate 2, Fig. 1; Plate 3, Figs. 1-4.) 
Habitat, — Station 3374, southwest of Malpelo Island ; March 3, 1891; lat. 
2° 35’ N., long. 83253" W., 1823 fathoms ; green ooze ; temperature, surface 800, 
bottom 36.4 ; one specimen, No. 7942. [H. 47. 
The Body is ovoid, about half as long again as broad ; the mantle-opening, as 
usual in the genus, closely surrounds the base of the siphon, which is com- 
paratively small and subulate. What remains of the fins (Plate 3, Fig. 2) is 
muscular, flattened, pointed, and directed outwards and forwards ; at the base 
of each is a gently hollowed, subtriangular surface, which during life articulated 
with the external surface of the anterior end of the dorsal cartilage (Plate 3, 
Fig. 3). There are, however, traces of a membranous expansion on the ante- 
rior edge of the fin. The dorsal cartilage is horseshoe-shaped (Plate 3, Fig. 1) 
and disposed in the horizontal plane of the body, with the concavity directed 
forwards : its surface is smooth, without any characteristic markings or 
prominences, 
The Head is so macerated that no description of it is possible. 
The Arms are subequal, and rather stout, soft, and tapering, rounded on the 
aboral aspect, wedge-shaped on the oral, the row of suckers occupying the 
narrow end of the wedge. All have lost their tips so the measurements given 
are merely approximate ; their original length, however, would be from 5 to 
10 mm. greater than the dimensions here given. The umbrella is entirely 
wanting, but it appears to have been attached directly to the arm, so that 
there was no intermediate web. It is impossible to ascertain how far the web 
extended on the dorsal side of the arm, but on the ventral its attachment ter- 
minated nearly halfway up the arm about the 25th sucker, as is shown by the 
presence in that position of a horny induration (Fig. 4) somewhat resembling 
that in S. meangensis (Hoyle, '86, Plate 11, Fig. 2). The suckers are upwards 
of 50 in number, and of the usual form, the largest being just over 1 mm. in 
diameter. The cirri are very small and begin as minute papillae only percep- 
tible with a lens between the fourth and fifth suckers; they extend up the 
arms beyond the attachment of the web on the ventral aspect, but how much 
further it is impossible to say. 
The color, when captured, is shown in Plate 1, Fig. 1, Plate 2, Fig. 1 
Dimensions. 
mm, 
Length, total -r ar 5... 5 a Bbont B0 
End of body to mantle-margin 5 9) e a 
Breadth of body 20. 9$ 
Breadth of head . . va 22 
Bent ne re 
Broadtn of ün vonem r o o e B 
Diameter of largest sucker onarm ...... 12 
1 The length of the fin is measured from the root outwards towards the tip. 
