1910.] NATURAL SCIENCES OF PHILADELPHIA. til 



of the arms arc evident, so thai il seems possible thai an undescribed 

 species of the genus is before us. The largest of the specimens, 

 however, has a mantle length of only 41 mm., and since we know 

 nothing of the younger stages of E. liuninosa, while the condition of 

 our own material leaves much to be desired, a more detailed con- 

 sideration of the speciology will best be deferred for the present. 



Family CftANCHIID^E. 

 Genus MEGALOCRANCHIA Pfeffer, 1884. 

 16. Megalocranchia pardus new species. PI IX, fig. 2. 



Small: elongate cask-shaped. Mantle thin, smooth, saccular, 

 membranous, much inflated; its greatest circumference near the 

 middle, thence tapering slightly anteriorly and more so behind, 

 where it comes to an acute point between the fins; maximum width 

 of mantle distinctly less thai! half the length. Fins small, about 

 three-tenths as long as the body; thin; semicircular; barely con- 

 tinuous around the point of the mantle, which they exceed for about 

 a third of their length ; posterior cleft deep and very narrow. Anterior 

 margin of the mantle trilobate, being conspicuously indented (almost 

 cleft) in the dorso-median line, as well as to a less degree at either 

 side of the funnel, the clefts marking the three points where the 

 mantle is firmly attached to the head and funnel. 



Head very short and broad, the length contained in the width 

 (measured to include the eyes) nearly four times; width of head 

 between the eyes less than the depth of the eyeball. Eyes very 

 large and protruding; elevated on short, massive, slightly movable 

 stalks; eyeball ovate in outline, projecting obliquely downward; 

 lid opening of fair size, not puckered. The ventral surface of the 

 eyeball is occupied by a large, semicircular, photogenic organ, which 

 forms a bluntly conical projection toward one side; another smaller 

 organ of crescentic outline lies within the concavity of the latter 



(fig. 19). 



Funnel large, thin-walled; broad at base, extending well past the 

 base of the ventral arms, and entirely covering the ventral surface 

 of the head between the eyes; aperture ample. Funnel organ well 

 developed; the large hepatiform medio-dorsal organ bears on each 

 lobe a finger-like papilla, which bends inward at the base so that it 

 lies ahno-T transversely; the two -mailer lateral organs are roughly 

 circular, and each has a slight indentation on the front inner margin 

 (fig. 20 j. 



Arm- short, robust, the longest but little more than a quarter as 



