294 PROCEEDINGS OF THE NATIONAL MUSEUM. 



less arcuate than the posterior and scarcely notched; traces of a 

 possible "accessory fin" or membrane evident on the margins of the 

 broken needle-hke process described above. 



Head small, rounded, much compressed dorso-ventrally. Funnel 

 large, thin walled, inflated, reaching about to the center of the head. 

 Funnel cartilages long and narrow, slightly widest posteriorly, thence 

 tapering to a point in front; their grooves simple. Eyes large. 

 Region of head in front of eyes leading to arms stout, four-angled. 



Arms well developed; the fourth pair, which are much the largest 

 and longest, about two-thirds as long as the body (exclusive of fins 

 and needle-like process), strongly keeled and bearing two rows of 

 small suckers for their entire length, the distal ones becoming very 

 minute; dorsal and second arms subequal, about half as long as the 

 Tentrals; third arms strongly compressed, keeled, and excessively 

 small, being between one-third and one-half as long as the neighboring 

 second pair. Suckers minute, in two rows throughout. 



Tentacle stalks about as thick as the second arms; clubs amputated 

 and their structure hence unknown. 



No luminous organs evident. 



Total length (exclusive of tentacles), 16.5 mm.; length of mantle 

 (dorsal), 10-l-mm. 



Type.—Cat. No. 338693, U.S.N.M. [S.S.B.6371. 



Type localif y.~200~0 m., station 10187, latitude 28° 59' N., 

 longitude 69° 22' W.; February 23, 1914. 



Remarks. — The inconspicuous specimen upon which the new 

 genus and species here proposed are founded has proven so difficult 

 to ahgn with any of the described oegopsids that independent treat- 

 ment has seemed to be unavoidable. Even its family relationships are 

 not altogether certain. In many ways it has quite the aspect of a 

 Ohiroteuthis, particularly in the enormously developed ventral arms 

 and the extreme posterior attenuation of the conus of the gladiiis, 

 but the presence of stalked olfactory tubercles is yet to ])e established, 

 and the funnel cartilages are far from tj^pically chiroteuthoid. 



The absurdly minute arms of the third pair are similar to those of 

 no other cephalopod with which I am acquainted. 



ENOPTROTEUTHIS, new genus. 



Small loliginiform oegopsids having the anterior mantle margin 

 free, the funicular cartilages being somewhat ovate. Body con- 

 tinued posteriorly between the enormous semicircular fins as a long, 

 extremely slender, needlelike process covering the very attenuate 

 cone of the ghidius, without accessory fins. Head prolonged in 

 front of the eyes into a squarish snout. Eyes large, on stout stalks. 

 Arms moderate, not strongly dissimilar. Tentacles with a minute 

 club bearing but few suckers (in two rows in present material). 



Type. — Enoptroteuthis spinicauda, new species. 



