480 Rev. Canon Norman's Revision 



the outer mandible, on each side. The head and eyes were 

 unfortunately lost." 



Steenstrup states that Plectoteuthis, Owen (1881), is the 

 hectocotylized arm of a male Architeuthus . 



Tribe II. Myo p si da (restricted) . 



Fam. 5. Loliginidse. 



Genus Loligo, Lamarck. 



Hectocotylization takes place in this genus on one of the lower 

 or ventral arms, on the basal portion of which the suckers are 

 normal, after which the size of the sucking-disks gradually 

 diminishes, while that of their peduncles increases in length, 

 till ultimately the disks entirely disappear and. papillae alone 

 remain, which give the extremity of the arm a fringed-like 

 appearance when viewed from the side. In certain exotic 

 species only one side of the arm is thus affected ; but in the 

 European forms both rows of suckers are similarly aborted. 



[Loligo vulgaris, Lamarck (but not L. vulgaris of British 

 authors) . 



Anterior part of sides of body and ventral surface spotted ; 

 some of the spots often take a ring-like form, but the body is 

 not painted with long dark markings. Tentacular arms having 

 the central rows of suckers large, the lateral very much 

 smaller, so that the diameter of the tatter is only half that of 

 the former and their height one third. Disks of central rows 

 of tentacular arms two to three times as large as largest 

 suckers of third arms, their horny rings having only half 

 their circumference finely toothed, whilst the other half is 

 toothless or only bears a group of four or five small blunt 

 teeth (in the northern form, says Steenstrup, these are indeed 

 the only teeth in the horny ring) ; suckers of lateral rows 

 with high pointed teeth on the upper half, while the lower 

 half is almost toothless. 



Mediterranean, Adriatic, Denmark {Steenstrup). 



This more southern form will probably be found on our 

 coast ; but all the specimens which both Mr. Hoyle and 

 myself have examined belong to the next species.] 



15. Loligo Forbesii, Steenstrup. 



Loligo vulgaris, Forbes and Hanley, Brit. Moll. iv. (1853), p. 226, 



pi. LLL. 

 Loligo Forbesii, Steenstrup, K. D. Vid. Selks. Skr. ser. 4, iv. (1856), 



p. 189, pi. i. fig. 2: Ann. & Mag. Nat. Hist. ser. 2, xx. (1857), p. 84. 



