CEPHALOPODS OF THE PHILIPPINE ISLANDS 57 



Corregidor Light, Manila Bay, 18 m., hard bottom, Feb. 7, 1909. 

 1 9? ML 9.0 mm., from off Teomabal Id., surface, Sept. 18, 1909. 

 1 juv., ML 5.5 mm., 1 (^ ML 9.0 mm. (some enlarged suckers on 

 ventral arm), San Miguel Bay, Ticao Id., Apr. 21, 1908; electric 

 light. 1 cf ML 12.0 mm. (most suckers missing), Bolinao, May 9, 

 1909; electric light. 



Sepiola trirostrata Voss, 1962 



Figures 7,d,e; 8,c,d 

 Sepiola trirostrata Voss, 1962, p. 172 



HoLOTYPE. — Male, ML 12.0 mm., taken by electric light at ship's 

 side, Nogas Pt., Panay, Feb. 3, 1908; USNM 575329. 



Paratypes.— 2 cfcf, ML 10.0-11.5 mm., 2 99, ML 11.0-12.3 

 mm., taken by electric light at ship's side, Nogas Pt., Panay, Feb. 3, 

 1908; USNM 575330. 



Description. — The mantle is short and saclike, broadest anteriorly 

 and tapering in a cone-shaped fashion to the posterior end. In the 

 females the end is blunt and broadly rounded, in the males it is 

 pointed. In the nuchal region, the mantle is connected to the head 

 by a broad commissure which is half the breadth of the mantle. 

 Ventrally the mantle margin is sinuous with a broad lobe on each 

 side of the funnel and a shallow excavation beneath it. 



The fins are small (about 40 percent of the dorsal mantle length) 

 and semicii'cidar, with a deep, free anterior lobe. The fin width is 

 slightly greater than the mantle length. 



The funnel is long and slender, tubular, tapering to a narrow 

 aperture. The locking apparatus consists of a small straight groove 

 on the funnel and a long slender ridge on the mantle. The funnel 

 organ is composed of a small inverted V-shaped dorsal organ with 

 a fused double center portion and two large oval ventral pads which 

 have an elongate and rounded lobe anteriorly. The funnel valve is 

 a slender organ with slightly diverging straight sides endmg in a 

 triangular point. 



The head is large with rather enormous eyes which have distinct 

 ventral lids. There is a small round olfactory pore just posterior to 

 and slightly ventral of the eyelid. 



The arms vary between the sexes but have a formula of 2=3.4=1 

 in most cases. However, in both sexes III is stouter than the others 

 and generally strongly curved inward. In the males. III is enor- 

 mously stout, more than twice as broad as the other arms. None of 

 the arms are equipped with protective membranes and there are no 

 keels except a broad ridge on the dorsal surface of IV which basally 

 connects with III. 



