M»16.] 



NATURAL SCIK.WKS OF I'll 1 L ADELPHIA. 



53 



near the middle; strongly compressed; flattened above, somewhat de- 

 pressed below between the large, rounded eyes. Funnel broad, 

 rather flat and short, not extending to the middle of the eyes; valved, 

 the valve appearing as a very delicate, crescentic, pocket-like mem- 

 brane on the inner dorsal wall a little way behind the aperture. 

 Funnel organ not easily made out in the material available, although 

 the A-shaped median organ of the dorsal wall is evident (fig. 6). 



Funnel locking cartilage straight, simple, pointed anteriorly, but 

 rounded truncate at the other end, and otherwise of nearly even 

 width; grooves shallow, simple, straight; margins raised and reflexed 

 (fig. 7). Slender ridges on the mantle correspond as usual. 



Fig. 6. 



Fig. 7. 



Fig. 6. — Lampadioteuthis megaleia, outline sketch of the funnel region [416], 

 X 2§; an., anus; phot., anal photophores; v., valve; v.o., median pad 

 of funnel organ. 



Fig. 7 .—Lampadioteuthis megaleia, camera outline of left funnel cartilage [416], 

 X 8. 



Sessile arms little attenuate, the longest over two-thirds as long as 

 the mantle; unequal; somewhat mutilated in the specimen at hand, 

 but the formula of relative length apparently 3 = 2, 4, 1; dorsal arms 

 notably shorter and less robust than the remainder. Outer margin 

 of ventral and third arms keeled, the second pair more obscurely so, 

 and the dorsal pair merely angled. On all the arms except the 

 dorsal pair the keel terminates in a very delicate, transparent carina 

 of membrane. The third arms in particular bear a strongly trabecu- 

 late hyaline membrane along their ventral margins, though all the 

 arms possess well-developed swimming membranes homologous with 

 these. Sucker-bearing portion of arms compressed; the suckers 



