CEPHALOPODS OF THE PHILIPPINE ISLANDS 153 



from stomach of Diomedea fulginosa caught at 58°52' S., 43° E. 

 (Chun), northern Mmdoro, Phihppuies! 



Bathothaunia lyromma Chun, 1906 



Figure 34 

 Bathothauma lyromma Chun, 1906, p. 86. 



Material.— 1 cf (?), ML 114.0 mm., Sta. D5238, Point Lambajon, 

 eastern Mindanao, 695 m., bottom temperature 43° F., May 12, 

 1908; USNM 575344. 



Description. — The mantle is long and cylmdrical, apparently 

 straight sided, truncated anteriorly, and bluntly rounded posteriorly. 

 The mantle is thin and almost membranous in consistency. The 

 anterior margin has the appearance of being puckered at the normal 

 points of attachment. Dorsally the long gladius is visible through 

 the skin; anteriorly it is blunt, slightly expanded, and plainly visible. 

 About a fourth of the mantle length posteriorly, the gladius becomes 

 very narrow and is hardly discernible but widens rather abruptly 

 about 10.0 mm. from the posterior end and here joins the base of the 

 two broadly separated fuis. Ventrally there are no cartilaginous 

 lines or tubercles at the point of attachment on either side of the 

 funnel. 



The fins are small, widely separated, and almost terminal, paddle- 

 shaped in outline, with narrow bases only 6.0 mm. wide. The indivi- 

 dual fuis are 12.5 mm. long and 14.0 mm. wide at the distal fanlike 

 end. The total breadth across the two fins is 37.0 mm. 



The funnel is large, weakly developed, and reaches almost to the 

 base of the eye stalks. Although it perhaps may have been torn, it 

 has a symmetrically arranged pair of elongate flaps on either side 

 and a median notch in the upper margin of the funnel opening. The 

 funnel organ cannot be accurately determmed m the single specimen 

 but it has the appearance of four facing oval pads, two dorsal and 

 two ventral. In addition, just below the funnel opening on the dorsal 

 side are two dark oval spots with a central round fleshy center with 

 a porehke opening. The nature of the latter object is not Imown. 



The head is long and slender, stalklike, 25.0 mm. from the anterior 

 mantle margin to the base of the arms, cylindrical, with narrow 

 eye-stalks originating at about the middle of the head. Above the 

 eye-stalks the head is somewhat narrower than below them. The 

 width across the eyes is 34.0 mm. The eyestalks are slender and 

 support a bulbus 14.0 mm. long by 10.0 mm. wide; the iris is on the 

 anterior border near the middle of the bulbus. Although difficult 

 to determine, there apparently is a moderately produced rostrum. 

 On the ventral surface of the bulbus is a long narrow lunar light organ. 



