21 



on the inner surface of the first, second, and third pairs of arms the 

 dark pigment is disposed in broad, irregularly shaped, transverse 

 bands, passing across between each of the pairs of suckers. 



The head, as is indicated by the trivial name, is comparatively 

 broad ; and the arms which it supports are relatively longer than in 

 the Loligines generally, the second and third pairs being nearly 

 equal in length to the trunk. The body is subcylindrical and coni- 

 cal, gradually diminishing in circumference till it terminates in a 

 point at the posterior margin of the fins, which do not extend con- 

 joined together beyond this part. The fins are terminal and dorsal, 

 a space of about half a line intervening between their origins ante- 

 riorly, whence their bases converge and are united at the apex of 

 the trunk : their superior contour is an obtuse angle ; their inferior 

 margin is rounded. 



In the Cephalopod described as Cranchia cardioptera, Per., to which 

 the species under consideration has a superficial resemblance, the 

 terminal fins have a semicircular contour, and their origins are 

 widely separated anteriorly; they also extend beyond the termina- 

 tion of the trunk : the trunk, moreover, is broader in proportion to 

 the head, and does not diminish gradually to a point, bvit is rounded 

 off at the posterior extremitJ^ The Cranchia minima of Ferussac 

 may be at once distinguished from Lol. laticeps by the extension of 

 the trunk beyond the small rounded fins, which gives a trilobate 

 contour to the termination of the body. 



In internal organization Lol. laticeps agrees with the other Loli- 

 gines whose anatomical structure has been ascertained. 



The fragments of the Decapodous Cephalopod obtained at Port 

 Jackson are too imperfect to allow of their being satisfactorily re- 

 ferred generically : they may, however, have belonged to a species 

 of Loligo or of Sepioteuthis. As in some species of both these 

 genera, the outer lip was characterized by eight short processes, on 

 the inner surface of which, at the extremity of each, were three or 

 four small suckers, attached by peduncles, and having precisely the 

 same structure as those of the eight large exterior arms. In this 

 repetition of the structure of the external series of cephalic processes 

 there is an evident analogy to the different series of labial processes 

 of Nautilus. In some species, as for instance Lol. Pealii, Le Sueur, 

 the acetabuliferous labial processes are more developed than in 

 Mr. George Bennett's specimen. In Z,o^. coro///^ora. Til., they have 

 been compared by Bojanus to the internal shorter series of tentacles 

 of a Medusa ; affording another evidence of the analogy, though 

 remote, between the Cephalopods and the Radiata. 



The two lateral processes at the termination of the 7-ectum being, 

 in this instance, evidently adapted to form a valve for the closure of 

 the anus, Mr. Owen was induced to examine the corresponding 

 structure in other species ; and to conclude, from his examination, 

 that similar appendages, although varying in form and position, 

 perform the same ofiice in other Decapoda. The slenderness of the 

 anal processes in Onychoteuthis and Loligopsis being such as to pre- 

 clude the possibility of their acting as mechanical guards, it is in- 



