406 A. E. Verrill — North American Cephalopods. 



Brachioteuthis Beanii, gp. nov. 



Plate LY, figures 3-3&; Plate LYI, figures 2-2a. 

 Male : Body rather small, tapering backward to an acute posterior 

 end ; dorsal mantle-edge with a broad obtuse angle ; caudal fin large 

 in proportion to the body, broad rhomboidal ; outer angles prominent, 

 anterior to the middle ; the anterior lobes project forward considera- 

 bly beyond the insertions, and are rounded. The form of the fin is 

 much like that of Ommastrephss. Head thickened at the bases of the 

 arms, not so large in proportion to the body as in C lacertosa. Eyes 

 large, eye-lids thin. Siphon large, with two strong dorsal bridles ; 

 internal valve broad, rounded, somewhat back from the orifice-; 

 connective cartilages long ovate, broadest behind (fig. 2a) ; doi'sal 

 cartilage of neck oblong, with a strong median ridge and two deep 

 parallel grooves. Lateral cartilages of mantle (fig. 2) are simple linear 

 ridges, extending to the edge of the mantle. Arms not very large, 

 somewhat rounded, long and slender; the dorsal ones are much 

 smaller and shorter than the others; two lateral pairs nearly equal 

 in size and length, more than two-thirds the length of the mantle. 

 Ventral arms shorter and much more slender than the lateral, more 

 than half the length of the mantle ; the ventral arms show but little 

 of the compressed, oblique form, so conspicuous in the preceding 

 species, and the crest or fold of skin along the outer-ventral angle is 

 narrow, thin, and not very conspicuous ; the suckers on the ventral 

 arms are in two alternating, not distant, rows, often appearing almost 

 as if in one row toward the base, where they become smaller, but are 

 of the normal cup-shaped form, with finely denticulate rims and 

 slender pedicels; the tips of both ventral arms are much injured, 

 but small, normal, long-pediceled suckers can be traced to the tip of 

 the left arm ; the right arm is denuded of its skin and suckers at the 

 tip. The suckers of the four lateral arms are in two rather close 

 rows, larger, oblique, low cup-shaped, attached by slender peciicels, 

 which are somewhat swollen just below the suckers; most of them 

 have lost their horny rings ; marginal membranes rudimentary. Web 

 between the arms, rudimentary. Tentacular arms very long and 

 slender, in alcohol about twice the length of the mantle; a few 

 scattered, sessile suckers are found along the whole length of the 

 arms; tentacular club well-developed, long-ovate, oblique, with a 

 thick wrist and flat or concave sucker-bearing face; suckers small 

 and very numerous, crowdedly arranged in many rows (probably 

 sixteen rows or more), some of the middle ones larger than the rest; 



