34 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Famity MASTIGOTEUTHIDAE. 
Mastigoteuthidae Verrill, ’81 A, p. 100. 
MASTIGOTEUTHIS. 
Mastigoteuthis Verrill, '81 A, p. 100. 
33. Mastigoteuthis dentata, sp.n. 
(Plate 6, Figs. 8-11.) 
Habitat, — Station 3400 ; E. of Galapagos Islands; March 27, 1891; lat. 
0° 36^ S., long. 86° 46’ W., 1322 fathoms; temperature, surface 81?, bottom 
36°; light gray globigerina ooze ; one specimen 9, No. 7956. [H. 102.] 
Station 3394; off Cape Mala; March 10, 1891; lat, 79 21^ N., long. 79° 35° 
W., 511 fathoms ; temperature, surface 739, bottom 41.28 ; dark green mud ; 
one specimen &, No. 7957. [H. 45.] 
This species differs from Mastigoteuthis agassizi (Verrill, '81 A, p. 100) in the 
fact that the horny rings in the suckers of the arms are furnished with teeth 
(Plate 6, Fig. 8), whereas in that species they are smooth. 
It differs from M. levimana Lönnberg ('97, p. 605) in the fact that the 
ventral arms are thicker and not thinner than the others and have the 
suckers normally disposed, It agrees with this, however, in the denticulation 
of the horny ring of the suckers. Lönnberg is mistaken when he says that 
the horny rings on the arms of the * Challenger" specimen had pointed 
teeth. The “Challenger” specimen was only a fragment of a tentacle and 
therefore gave no information regarding the suckers of the arms. 
The two sexes show an interesting difference in the form and proportions of 
the body and fin, the latter being two-thirds the length of the mantle in the 
male and only about two-fifths in the female ; the body too is more conical 
in the former, more cylindrical in the latter. The absolute dimensions of the 
male are much smaller, but there is no evidence to show whether the speci- 
mens are full grown. One of Verrill’s male specimens attained a length 
of 232 mm., which is intermediate in size between the two examples here 
described. : 
The general arrangement of the organs seen on opening the mantle-cavity is 
shown in Plate 6, Figs. 10, 11. 
Dimensions, 
195739 70509 
mm, mm. 
Length, total (without tentacles) . . . . 180 9290 
End of body to mantle-margin . . . . . 72 140 
ENG OP wody W Ye v o. 7 M 155 
Brent ae 30 
Breadth ofheud aci soe a nee 
Jengürobün . (3. $... 1.0.1... 48 60 
Breadth otin s y v. wo. v Ss. € 08 75 
