CEPHALOPODS OF THE PHILIPPINE ISLANDS 167 



Family Argon autidae 



Argonauta argo Linnaeus, 1758 



Argonauta argo Linnaeus, 1758, p. 708. 



Material. — 1 shell, Sta. D5423, Cagayan Id., Mar. 31, 1909; 

 USNM 238403. 1 shell, Sta. D5188, Pescadero Id., Apr. 1, 1908. 

 1 shell, Sta, D5601, Limbe Id., Celebes, Nov. 13, 1909. 



Only empty shells of this species were obtained at the above sta- 

 tions, so no observations on the animal can be made at present. 

 Sasaki (1929, p. 23), because of the difference in the radula, doubted 

 that the Japanese form referred to this species is identical with the 

 Mediterranean. The shells are compressed, with a narrow keel 

 and rather narrow aperture. The sides of the shells bear numerous 

 simple and bifurcate ribs, most of which extend from the columella 

 to the carinal knobs, but a few outer ones are separate, forming 

 secondary ribs. The keel bears two rows of low but rather sharp, 

 numerous, and closely spaced tubercles. The color is a shiny white 

 except for the keels which may be black or brownish (sepia). The 

 sides of the shell form a low outward-turning projection on each side, 

 termed the "ear," but these are not prominent nor turned widely 

 outward. 



Type. — British Museum (Natural History). 



Type locality, — "Habitat in pelago, M, Indico, Mediterraneo," 



Distribution. — Cosmopolitan in warm and temperate seas. 



Argonauta hians Solander, 1786 



Argonauta hians Solander, 1786, p. 44. 



Material. — 1 shell, Sta, D5207 off Badian Id,, Samar, Apr, 14, 

 1908; USNM 234833, 1 shell, Sta, D5397 off Talajit, between 

 Samar and Masbate, Mar, 15, 1909; USNM 234177. 1 shell, 

 Sta, D5419 off Tubigan Id., Bohol, Mar. 25, 1909; USNM 229186, 

 1 shell, Sta. D5404 off Dupon Bay, Leyte, Mar. 17, 1909; USNM 

 229380. 1 shell, Sta. D5374 off Tayabas Bay, Luzon, Mar. 2, 1909; 

 USNM 238272, 4 shells, Sta. D5407, Ponson Id., Dupon Bay, 

 Leyte, Mar, 17, 1909; USNM 238272, 1 shell, Sta, D5405, Ponson 

 Id., Dupon Bay, Leyte, Mar. 17, 1909; USNM 238262. 



Empty shells were dredged up at the stations listed. The shells 

 are small, with a wide keel which bears 15-23 large, widely spaced, 

 very prominent carinal knobs. The ribs are less numerous than in 

 A. argo, with less bifurcation and with rather regularly spaced second- 

 ary ribs. The "ears" are usually very pronounced, large, and turned 

 strongly outward, the aperture much wider than in argo. The 



