146 Transactions. 



multiple bands of round bluish, photopliores (4 bands in all), of which the inner 

 pair are the most regular, persist farthest posteriorly, and are the broader, 

 including a central series of comparatively large distant organs flanked on 

 each side by a more numerous series of smaller and darker ones. Lateral 

 to these 4 bands on each side is a somewhat irregular single series of small 

 organs, with traces of at least 2 similar rows beyond this. In all these 

 lateral series the photophores exhibit a curious tendency to lie in longi- 

 tudinal groups of three, the median organ of wh ch is in each case the 

 largest. The differentiation of the organs into those of a larger and a 

 smaller type is evident as in other species, but not conspicuous, and there 

 are many of various intermediate conditions. 



2. Dorsal Aspect. — -A single series of very minute distant organs extends 

 along the dorsum close to the gladius on either side. There are a few 

 scattered organs, apparently traces of other longitudinal rows, here and 

 there over the remainder of the dorsal surface. 



B. Th", Funnel. 



Four series (or, better, groups) of photophores similar to those of the 

 mantle occur on the ventral aspect of the funnel. They are well separated, 

 the two median groups being closer to one another than ei.her is to its 

 lateral neighbour. 



C. The Head and Arms. 



1. Ventral Aspect. — Here there are 3 conspicuous biserial to triserial 

 bands of organs, of which the median is the broadest, at least posteriorly, 

 where it bifurcates into 2 triangular groups ; one of the larger type of 

 organs occurs at the point of bifurcation and another in the centre of each 

 group. Anteriorly the median band becomes single and again bifurcates, 

 the 2 resulting series extending along the inner margin of each ventral 

 arm not quite to its extremity. The lateral bands likewise extend along 

 the ventral arms, running out their outer margins to the tips Lateral to 

 all these on each side is a single series of the organs ; this series is inter- 

 rupted by the clear area overlying the large subocular photophores, but 

 thereafter continues along the outer edge of the membrane bordeJng the 

 ventral arms, so that in all there are 3 rows of photogenic organs on each 

 member of this arm pair. A circlet of photophores borders the aperture 

 of each eyelid, and there is a single series of some 4 or 5 of the organs on 

 the outer angle of the basal portion of th third arms. 



2. Dorsal Aspect — I have been unable to detect the presence of photo- 

 genic organs on the dorsal surface of the head, or on any of the dorsal or 

 dorso-lateral arms. 



D. The Tips of the Ventral Arms. 



A series of 3 very minute but heavily pigmented organs is to be made 

 out at the tip of each ventral arm. They are not conspicuous, are too 

 small to be designated even as " swellings," and would be apt to escape an 

 unwary examination. 



E. Eyes. 



A longitudinal series of 5 large round bead-like organs is borne on the 

 ventral periphery of each eyeball. They are of a dark-red colour, the centre 

 paler and are very similar in size and appearance. The three central 

 organs are so close together as to appear almost in contact, but each ter- 

 minal organ is set off by a slight space. 



Colour of the entire animal a brownish buff, dotted above with numerous 

 scattered brownish chromatophores. On the dorsal aspect of the head the 



