CEPHALOPODS OF THE PHILIPPINE ISLANDS 37 



Family Sepiadariidae 



Sepiadarium gracilis Voss, 1962 



Figure 4,o,& 

 Sepiadarium gracilis Voss, 1962, p. 170. 



HoLOTYPE. — 1 9, ML 16.0 mm., preserved in alcohol, Sta. D5290; 

 USNM 575325. 



Type Locality. — Varadero Harbor, northern Mindoro, July 22, 

 1908. At ship's side with electric light, 11:30 p.m. to 12:30 a.m. 



Description. — A single female was taken alongside the ship under 

 the electric light at Varadero Harbor. It was in an excellent state 

 of preservation and the following description and illustrations are 

 based upon the unique specimen. 



The mantle is nearly twice as long as wide (MWI 59.3), bluntly 

 rounded posteriorly, and joined to the head in the nuchal region by a 

 commissure which is less than one-third the mantle length (NCI 

 28.1). Laterally, the margins project forward to shield the eyes as 

 two broad-angled lappets. Ventrally, the mantle margin projects 

 slightly forward beneath the funnel and is sinuous. 



The fins are small, less than half the mantle length (FLI 43.7) and 

 longitudinally ovate, imited to the mantle by most of the base and 

 only slightly am'iculate anteriorly. 



The funnel is long, extending beyond the level of the eyes, is tubular, 

 and is free for most of its length, with a narrow aperture. The mantle 

 is undetachably fused to the base of the funnel on each side, the 

 fusion long and narrow, extending outward onto the ventral surface 

 of the funnel adductor muscle. The funnel organ consists of a small 

 inverted V-shaped dorsal member and two oval ventral pads. The 

 valve is subterminal and narrow with a sharp point and strongly 

 concave sides. 



The head is prominent, large, wider than the mantle (HWI 64.4), 

 and bears large eyes with distinct ventral lids. No olfactory tubercle 

 was evident. 



The arms are in the order 3.1.2.4, rather fat, and muscular. They 

 are united at their bases by a web which is subequal in sectors A and 

 B, moderate in C, and deep in D (WDI 38.9). The web in sector D 

 completely envelopes the basal section of the tentacle, forming a 

 rather unusual sheath about it. There is no web between the ventral 

 arms. The suckers are in two rows throughout, with about 40 pairs 

 on III of which the largest has a diameter of 0.6 mm. They are borne 

 on short pedicels. The horny rings appear to be smooth but are 

 encircled by a papillate area. 



