140 PROF. OWEN ON NEW AND RAEB CEPHALOPODA. 



genus are exemplified in the combination of the large naked eyeballs, the large and loose 

 funnel (extending, when not reflected, as at ??i, PI. XXVII. fig. 1, to the interspace of 

 the eyeballs), the short but broad and here rounded terminal fins, Jc, k, and the yery 

 long, slender, and seemingly non-retractile tentacles, t. 



The head, of which the prominent eyeballs, o, o, form the broadest part, is not con- 

 tracted at its fore part, and is but very slightly so behind. There is no lacrymal depres- 

 sion, nor any rudiment of eyelids. A series of small spots around the margin of the wide 

 orbit scarcely rises above the surface. The iris or capsule of the lens seems to be 

 naturally exposed; the conjunctiva, ^j, continued from its periphery, is reflected upon 

 the back part of the eye-globe as far as the entry of the nerves from the optic ganglion ; 

 the long diameter of the lens is in the line of its axis. 



The cephalic arms are subequal, moderately long. Those of the dorsal pair (PI. 

 XXVII. 1, 1 ) are each 5 inches in length and 5 lines in basal breadth, those of the ventral 

 pair (ib. 4, 4 ) are each 5^ inches in length and are rather narrower at the base. Each arm 

 presents a quadrate transverse section, being tetrahedral (PI. XXVI. fig. 4) ; the inner 

 or central angles (ib. ib. e, e) are fringed with a very narrow delicately scalloped mem- 

 brane, to the inner side of which the suckers, f,f, are attached each by a slender 

 pedicle (fig. 5,jj). The three pairs 1,2, 3 of arms are attached to each other at their 

 bases by two small webs, the broader one at the central, the narrower one at the peri- 

 pheral angles ; the arms 3 and 4 are connected basally by the peripheral web, g, only, 

 which is broader than in the others, and forms the outer wall of the depression lodging 

 the base or root of the tentacle. The tentacles, t, t, arise close together from a glisten- 

 ing mass of ligamentous substance at the inner part of the ventral side of the head, a 

 little in advance of the orbits, whence they diverge to issue at the interspaces between 

 the arms 3 and 4. 



There seems not to be any cavity capable of receiving them entire in a retracted state, 

 as in the ordinary Squids and Cuttles. Their clavate acetabuliferous ends, which may 

 be supposed to have existed from the analogy of other species of LoUtjopsis (L. veranii^ 

 e.g.), in which the tentacles were fortunately entire in the captured specimen, have" 

 been broken ofi" in the present instance, as in the species Loligopsis cyclura, Lesueur, 

 figured in the first volume of the Society's 'Transactions,' pi. ii. p. 21, as L. guttata, 

 Grant ; and in Perothis pellucida, or Perothis escholtzii, Eathke ' . 



The brachial acetabula, attached or, as it were, suspended to the central borders 

 (figs. 3, 4, e, e) of the ordinary arms, are small, not exceeding 1| millim. at their base ; 

 this adheres by a short and pyriform peduncle (fig. 5) to, or close to, the brachial fringes. 

 They are consequently in two series, of which the alternate arrangement is feebly shown. 

 The two rows are as distinct at their basal beginning as in the rest of the course 



1 Mem. de I'Acad. Imp. des Sciences de St. Petersbourg, tom. ii. p. 159, pis. 1 & 2. This species is held 

 by d'Orbigny to be identical with the Leachia (Loligopsis) cyclura of Lesneur. I have added in outline, to one 

 of the broken tentaelcs in pis. v. & vi., the clavate end as figured in pi. viii., d'Orb. op. cit. 



