PROF. OWEN ON NEW AND RARE CEPHALOPODA. 137 
fig. 2, 6), the mid lobe more prominent than the side ones 4'; on the ventral surface 
(Pl. XXV. fig. 2) the hinder two thirds of the mid lobe, 4, are traversed by a median longi- 
tudinal groove. ‘This is barely indicated in the sepium of S. officinalis, but is continued 
through the whole length of the same part and surface of the sepium of S. australis, 
d’Orb.’, which has a sharp and slender well-produced “ mucro.” The specific characters 
of the sepium of S. palmata are well brought out in a comparison of the figures of that 
part in the plates of the richly illustrated work of the French cephalopodists. The 
form which comes nearest to the sepium of the present species is that of 8. longimanus 
of Quoy ?. 
The colour of Sepia palmata, in the quiescent state of the Cuttle, is a dull or dirty 
subviolet-pinkish. 
The subject of Plates XXIV. and XXV. was captured off the shore of Norfolk Island, 
Australia. The figures are reduced to three fourths of the natural size. 
Genus SEpPiorevutuis, Blainville *. 
Species SEPIOTEUTHIS BREVIS, Owen. (Plate XXVI. fig. 1.) 
The present form of Decapod agrees with Sepia in the extent of attachment of the 
lateral fins (ib. e, e); but the development of the internal shell is restricted to the sheath, 
or part homologous with the “guard” of the Belemnite, the chamber-walls of the 
phragmocone not being developed, and no part of the shell being calcified. 
Of this form I have received a specimen from the Japanese sea, the arms of which 
had suffered some mutilation; but the proportion of the body to the head, of the breadth 
of the body to its length, and the narrowness of the lateral fins forbade its reference to 
any of the previously described or defined species of Sepioteuthis to which, or to their 
descriptions, I have had access. 
I submitted the specimen to dissection, found that it was of the male sex; and, as 
these organs have not, to my knowledge, hitherto been made known in the genus 
Sepioteuthis, I add a figure of them, in situ, to the few remarks now submitted on the 
characters of the species. 
The head is short and broad across the eyes. These have a tegumentary covering, 
transparent as in Sepia, and leaving the curtained iris (ib. fig. 1, m) visible. Behind 
the prominence of the eye-ball alow ridge of integument, with a subcrenate border, 
n, extends in a parallel curve, and, from its relation to the acoustic foramen, has been 
compared to an external ear *. 
The cephalic arms are short, provided on their dorsal or peripheral surface with a 
longitudinal tegumentary fold, a’, and on the opposite surface with two rows of acetabula 
' Op. cit. p. 285, pl. (Seiches) 7, fig. 4. 
2 Zoologie de l’Astrolabe, fol., tom. ii. p. 68, Mollusques, pl. 2. figs. 2, 11. 
5 Malacologie, 8vyo, 1823 (syn. Chondrosepia, Leuckart, 1828). 
* “ Oreille externe,” d’Orb. op. cit. p. 297. 
