174 Prof. M'lntosh's Notes from the 



it approaches 25 inches. The size of the terminal poik'^t, in 

 contrast with that of a specimen with a body 15^ inches long, 

 is great, viz. 17 mm. in depth at the proximal edge, and from 

 that to the flexible tip 20 mm. It is marked by the usual 

 ridges. 



'I'he description of the arms by Dr. Goodrich would do 

 fairly for the })resent specimen, the latero-ventral frill of the 

 third right arm (PI. VII. fig. 1) being conspicuous, and at 

 its distal third, the widest portion, is at least an inch and 

 a half in breadth. As mentioned by Dr. Goodrich, it is 

 supported by thick ridges. Each arm has two rows of 

 suckers (PI. VII. fig. 2), which differ from those described 

 and figured by Goodrich, but agree with those of the common 

 Omvmstrephes sagitfatus, and this is confirmed by Dr. Hoyle, 

 who kindly examined both the example and its suckers, and 

 to whom I am indebted for much information. The largest 

 suckers on the arms measure 15 mm. over all, and the aperture 

 with the teeth 10 mm. t7i situ. The proximal half of the rim 

 (as it lies on the arm) has a series of small teeth, whilst the 

 distal half has larger recurved teeth, the whole surrounded 

 by the mobile muscular investment. The central cushion is 

 attached to the tough pedicle. Wiien removed from its 

 investment (PL VII. fig. 3) the horny rim is distinctly 

 oblique, the edge trending from the large teeth forming a 

 long hoof-like process which apparently gives a larger surface 

 for its attachment. The arrangement of the teeth on the 

 rim is more or less uniform (PI. VII. fig. 3), viz. a median 

 very large tooth, often more or less blunted by use, and two 

 or three somewhat smaller teeth on each side, the points of 

 these being very sharp. Occasionally a smaller tooth occurs 

 between the lateral teeth of one side. The teeth spring from 

 a thickened horny rim and are sheathed externally in a hard, 

 glistening, pale yellow substance, which appears to perform 

 the part of enamel. So far as could be seen, no fold 

 supporting horny plates existed round the outer margin. As 

 the tentacles were absent nothing can be said about their 

 suckers, but they must have been of large size, and probably 

 with a more or less even series of teeth, as in the smaller 

 examples. 



In a specimen which has a mantle about a foot in length, 

 and which has a diameter at its widest part of 3 inches, the 

 arms range from 7-7| inches in spirit, the third right arm 

 having a keel, which, however, is but slightly developed in 

 contrast with the old example. The tentacles are 10-11 inches 

 in length and bear larger suckers than on the arms. The 

 length of the caudal fin along its outer edge is 4^ inches. 



