HOYLE: REPORTS ON THE CEPHALOPODA. 20 
same, but the filaments are considerably longer. The arms of the third pair 
. are the largest of all, and were probably twice as long as the first pair; but 
as they have both been broken off it is impossible to say exactly what was their 
original length. The filaments in this case are much longer, and in the centre 
their length is fully four times the diameter of the arm. On the outer aspect 
of the proximal half of these arms is a distinct keel. The arms of the fourth 
pair are about as long as the first. They have two rows of suckers, but none 
of the filaments just described ; only a small lappet arising opposite each 
sucker of the inner series. On the outer aspect of each of these arms is a broad 
membrane, which stretches outside the root of the tentacle across to the root of 
the third arm and. passes nearly to its tip, becoming gradually narrower as it 
proceeds. Here and there between the filaments may be seen the remains of a 
very delieate membrane which seems to have united them, but it is impossible 
to say how far along the arm this membrane may have extended, or how far 
it may have reached up the filaments. The only structure with which I am 
acquainted comparable to this is the series of lappets connected by a membrane, 
which has been above described in the case of Abraliopsis (see pp. 37, 38, postea), 
or the membrane supported by ribs seen in some forms of Ommastrephes. 
The suckers are helmet-shaped, mounted on short tapering peduncles, and 
With smooth, horny rings. 
It is impossible to form any correct idea of the family to whieh this inter- 
esting form should be referred. 
Famıny LOLIGINIDAE. 
Loligidae d'Orb., in: Férussac and d'Orbigny, ’35, p. 297, 
Loliginei Steenstrup, '61, p. 69 (1). 
Loliginei Steenstrup, '81, p. 28. 
LOLIGO. 
] Loligo Schneider, ‘84, p. 110. 
Loligo Lamarck, 199, p. 10 (pars). 
27. Loligo diomedeae, sp. n. 
(Plate 5, Fig. 13; Plate 6, Figs. 1-7.) 
Habitat. — Station 8422, off Acapulco; April 12, 1891; lat. 16° 47’ 30” 
N,, long. 99° 59° 30” W., 141 fathoms; green mud; temperature, surface, 
83°, bottom 53.95 ; one specimen Q, No. 7958. [H. 46.] 
The Body is comparatively long, and cylindrical for more than half its 
length, tapering rather rapidly to the posterior extremity. The fin is decidedly 
short for a Loligo, broader than long, slightly notched at its anterior points of 
