46 U.S. NATIONAL MUSEUM BULLETIN 234 



Subfamily Sepiolinae 



Euprymna phenax Voss, 1962 



Figures 6,a,b; 7,a 

 Euprymna phenax Voss, 1962, p. 171. 



HoLOTYPE. — 1 d^, ML 11.0 mm., taken at ship's side by electric 

 light, Nogas Point, Panay, Feb. 3, 1908; USNM 575328. 



Description. — Only a single specimen of this interesting species 

 was foimd in the collections. It was preserved in excellent condition 

 and permits a detailed description. 



The mantle is saccular, bluntly rounded posteriorly, and connected 

 to the head in the nuchal region by a broad commisure about three- 

 fourths the width of the mantle. In preservation the mantle margin 

 is folded down on each side of the nuchal commissure, but in life this 

 margin probably extended forwards, partly shielding the eyes. Ven- 

 trally, the mantle margin is extended forward, the lobes on each side 

 of the funnel reaching beyond the eyes, but there is a deep V-shaped 

 notch beneath the funnel. 



The fins are small, about 43.0 percent of the mantle length. They 

 are cu'cular in outline with a deep anterior cleft, and are united to the 

 mantle by a narrow base. Together their width is 127.0 percent of 

 the mantle length. 



The head is large, a little wider than the mantle (HWI 91.0), with 

 large eyes. There is a distinct ventral lid. 



The funnel is long, tubular, and rather stout, extending weU beyond 

 the level of the eyes. The locking apparatus is stout and straight. 

 The funnel organ is composed of a small inverted V-shaped dorsal 

 member and small compact ventral pads. There is no valve. 



The arms are in the order 3=2.4.1. They are without protective 

 membranes. The suckers are biserial. In the holotj^pe, they are 

 apparently of equal size in both rows and there are apparently no 

 specially enlarged suckers present, although, inasmuch as most of the 

 suckers are absent, one cannot overlook the possibility that one or 

 more may be enlarged in a complete specimen. The suckers are 

 obliquely inserted and have smaU apertures with smooth rings. 



The left dorsal arm is hectocotylized in the following manner: 

 Basally, there are 10 pairs of normal suckers covering about two- 

 thirds of the length of the arm. The 3d pair in the ventral row is 

 modified into an enlarged fleshy papilla with a degenerate sucker at 

 the tip. The distal third of the arm bears about 10 pau's on enlarged 

 fleshy pedicels. They are crowded, their bases forming a palisade 

 on either side of the arm with the suckers of each row facing outward. 



