HOYLE: REPORTS OX THE CEPHALOPODA. 29 



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 ofif it is impossible to say exactly what was tlieir 

 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 delicate 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 Ahraliojms (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 anj-- correct idea of the family to which this inter- 

 esting form should be referred. 



Family LOLIGINIDAE. 



Loh'fjidae d'Orb., in : Fe'russac and d'Orbigny, '35, p. 297. 

 Loliginei Steenstrup, '61, p. 69 (1). 

 Loliginei Steenstrup, '81, p. 28. 



LOLIGO. 



Loligo Schneider, !84, p. 110. 

 LoIhjo Lamarck, !99, p. 10 (pars). 



27. Loligo diomedeae, sp. n. 



(Plate 5, Fig. 13; Plate 6, Figs. 1-7.) 



iTrtW/rtf. — Station 3422, off Acapulco; April 12, 1891 ; lat. IG° 47' 30" 

 N., long. 99° 59' 30" W., 141 fathoms; green mud ; temperature, surfiice, 

 83°, bottom 53.°5 ; one specimen 9, No. 7958. [H. 46.] 



The Body is comparatively long, and cylindriail 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 



