3o6 



BULLETIN OF THE BUREAU OF FISHERIES. 



on short pedicels, and ranked along the margins of the arms so that the tv.o rows are very widely sepa- 

 rated (pi. u, fig. 2); horny rings apparently smooth to the eye, but under a high power exhibiting 

 some seven to eight very short, wide, squarely truncate teeth on their superior margin (text fig. 14, pi. 

 ui, fig. 5). 



No hectocotylization observed. 



Tentacles very variable in length, elastic; outer surface rounded except along the distal portion 

 of the club, where there is a conspicuous membranous keel; inner surface flattened. Club spatulate, 



its widest expansion near the base; tip strongly and obliquely recurved. 

 Suckers rather small, flattish, crowded, very obliquely placed on short 

 pedicels in seven to eight rows; largest near the middle of the expanded 

 portion; apertures large, cro\%-ned above by a broad, lobed frill; homy 

 rings armed with about thirty delicate, acute teeth of exceeding minute- 

 ness (text fig. 14). Sucker-bearing area bordered by a narrow membrane. 

 Fixing apparatus very remarkable, comprising two series of suckers and 

 pads extending from the club at its point of broadest expansion far down 

 upon the stalk; first, about seven pads and as many minute suckers alter- 

 nating in single file run along the extreme dorsal margin of the proximal 

 portion of the club and the distal end of the stalk; the second set of 

 suckers and pads are also minute and in single file, but they extend along 

 the ventral margin of the stalk and alternate bypairs, the first two suckers 

 being opposite the last two of the other series; in the proximal set there 

 are eight suckers and six pads, rather closely placed distally, but becom- 

 ing quite distant down the stalk (pi. Li, fig. 3). 



Buccal membrane well developed, 

 wide, seven-pointed (pi. L, fig. 3). 



Gladius extremelj' delicate, with a 

 slender midrib and broad lateral expan- 

 sion. 



Fig. 15. — Meleagroleuthts koylet, 

 integument from anterior ven- 

 tral margin of mantle showing 

 photophores; drawn from a 

 mount in balsam, X(?). [109.] 



Radula not examined. 



Integument smootli, delicate; the outer epidermis rather loose and 

 easily delaminated or rubbed off in preserved specimens. Every- 

 where punctate with small purplish chromatophores, so that the whole 

 animal except the pale margins of the fins is of a livid purple-brown 

 color. 



Photophores exceedingly numerous, but apparently distributed 

 with a surprisingly constant regularity. Owing to their great multitude 

 this is somewhat obscvire on the ventral surface of the mantle ; dorsally 

 more sparse; none on the ventral surfaces of the fins, but a few extend 

 out on their bases above; a very distinct, close set row borders the 

 anterior mantle margin below the funnel (text fig. 15). On the ventral 

 siuf ace of the head the organs appear ranked in about twenty-four longi- 

 tudinal rows ; on the dorsal surface about half as many , composed of much 

 smaller and more widely spaced organs. These rows are continued from 

 the head out upon the arms as follows: Upon the first and second arms, 

 three rows; upon the tliird pair, four; upon the ventral arms, about eight; on none of tliearmsdo more 

 than two or three of these rows persist to the tips. In addition, a distinct single ring of photophores 

 circumscribes the border of each eyelid. The asymmetrical appearance of the head in gross aspect 

 extends in an equally striking degree to the arrangement of its phosphorescent organs; those of the 

 right side in general more crowded and more sharply defined, although actually no more numerous. 

 The greatest differences present themselves in the development of the circumocular rings; that of the 



Fig 



M eleagroteuthis hoylei, indi- 

 vidual photophore enlarged from 

 preparation shown in fig. 16. X(?). 

 [109.1 



