Boone, Mollusca, Cruises of "Eagle" and "Am," 1921-28 173 



References: Ommastrephes gigas D'Orbigny, Voy. Amer. Merid., 

 vol. V, p. 50, Atlas of Mollusks, pi. IV, as Loligo gigas, 1846. — 

 Tryon, Man. Conch., vol. I, p. 179, pi. 80, figs. 357-360, 1879.— 

 von Martens, Sitz. naturf. Freunde Berlin, p. 234, 1894. 



Ommastrephes giganteus Ferussac and D'Orbigny, Cephal. Acetab., 

 p. 350, 1839. Loligo tab. 20; Ommastrephes tab. 1, figs. 1-13, 

 1839.— Gray, Catal. Mollusks Brit. Mus. Cephal., p. 60, 1849. 



Dosidicus steenstrupi Pfeffer, Abh. Ver. Hamburg, vol. VIII, p. 20, 

 fig. 27, 1884. 



Dosidicus gigas Pfeffer, Jahrb. Hamburg, "Wissensch. Anstalten 

 XVII, p. 180, 1900 ; Cephalopoden der Plankton-Exped., p. 509, 

 taf. 42, figs. 9-14, taf. 43, 1912. 



Family: CRANCHIIDAE. 



Subfamily: Cranchinae. 



Genus: PYRGOPSIS Rochebrune. 



Pyrgopsis schneehageni (Pfeffer). 



Plate 108. 



Type: The type which is apparently the only other specimen 

 recorded, was collected in Chile, by Schneehagen, and is deposited in 

 the Hamburg Museum. 



Distribution : Known only from the type locality and the present 

 specimens, dredged in 300 fms., Pacific Ocean, fifty miles S. W. of 

 Cape Mala, Panama. The "Am" record substantially extends the 

 northern record of this species. 



Material examined: Two specimens, dredged in 300 fms., fifty 

 miles S. W. of Cape Mala, Panama, March 16, 1926, by the "Am." 



Color: The color plate in Mr. Vanderbilt's "To the Galapagos on 

 the 'Am,' " painted from the living animal, by Mr. W. E. Belanske, 

 shows this deep-sea squid to be opalescent ivory. 



Technical description: The larger of the "Am" specimens meas- 

 ures 106 mm. long from the median dorsal point of the anterior mantle 

 margin to the posterior margin of the fin. The fin comprises 36 mm. 

 of this length, or about one-third of the total length. The head is 

 8 mm. long and not very wide. The mantle is very slender, tapered 

 posteriorly to a pointed apex that terminates midway the ventral 

 surface of the fin. The anterior margin forms a slight median dorsal 

 point. The pen shows through the mantle as shown in figure A and 

 is of the shape figured ; pointed anteriorly, the shaft long and tapered 

 posteriorly, with the narrow lanceolate wing expansion on the pos- 



