300 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.58. 



Head distinctly narrower than the body, but wide and strongly 

 flattened; delimited from the body by a nuchal ridge, and covered 

 by a loose, transparent skin. Eyes large and conspicuous. Funnel 

 large, thick-walled; free only at the tip, which extends barely to the 

 base of the ventral arms. 



Arm formula 3, 2, 4, 1; dorsal arms small and slender, about a 

 third shorter than the mantle; ventral arms but little longer; second 

 arm pair about a fourth longer than the mantle and nearly twice as 

 long as the dorsal arms. Third arms more than twice as long as the 

 second pair and much larger and thicker, increasing slightly in diam- 

 eter from the base to near the middle, thence diminishing gradually 

 until at the tips they taper off quite abruptly ; somewhat compressed 

 dorso-ventrally but not keeled. First three or four suckers at base 

 of arms in a single (sometimes weakly zigzag) row; remaining suckers 

 in two rows, large, circular, well elevated. Umbrella thin, delicate; 

 very short, especially between the arms of the dorsal and ventral 

 pairs. 



Surface nearly smooth, but dorsal region of body showing a very 

 minute, scattering, granular papillation under sufficient magnification. 



Color in alcohol grayish buff, except the eyes, which are dark bluish 

 or slaty, with a golden iridescence around the pupil. Chromato- 

 phores few and scattered, the most conspicuous being a single pair 

 near the median line on the head just in front of the nuchal region. 



Total length, 22 mm.; length of mantle (dorsal) 4.5 mm. 



Tijpe.—Csi.i. No. 338699, U.S.N.M. [S.S.B.682J. 



Type Locality.— 1^-0 m., station 10204, off Biscayne Bay, Florida; 

 March 20, 1914. 



Remarks.— Th.& only species to which this small but very bizarre 

 little octopus seems at all similar is the Octopus gracilis of Verrill 

 (1884). The present specimens differ manifestly from Verrill's de- 

 scription in several particulars, notably the still greater enlargement 

 and lengthening of the third arm pair, the relative shortness of the 

 dorsal arms, and the minute dorsal papillation. Even though they 

 eventually prove to be conspecific, however, it seems safe to apply a 

 new name to the Bache species, as that chosen by Verrill was utilized 

 over thirty years previously by Eydoux and Souleyet (1852), although 

 their species is now referred to the genus Tremoctopus. 



EXPLANATION OF PLATE 16. 



FiQ. 1. Sandalops pathopsis. Ventral aspect of type. 



2. Sandalops ecthambus. Ventral aspect of type. 



3. Chiroteuthoides hastula. Ventral aspect of type. 



4. Polypus Scorpio. Ventral aspect of type. 



5. Pyrgopsis lemur. Ventral aspect of type. 



6. Enoptroteuthis spinicauda. Ventral aspect of type. 



7. Teuthowenia (Ascoteuthis) corona. Ventral aspect of type. 



