141 BuivI^ETIN 38 171 



CLASS CEPHALOPODA 

 ORDER DIBRANCHIATA 

 Genus ARGONAUTA Linnseiis 



argo var. americana Dall, Bull. 37, U. S. N. M., pp, 174, 200, 

 pi. 43, f. I a-b, pi. 64, f. 142b, pi. 67, f. 1-3, 1889; Johnson, 

 Occ. Pa. Bost. Soc. Nat. Hist., 7, p. 223, 1915. 



Distribution. — Massachussetts north to 43° N. Lat., and 

 south to the Antilles and doubtfully to Brazil. Gulf of 

 Mexico, West Florida region. 



Note. — The typical Argonauta argo Linnseus, Syst. Nat., 

 ed. X, p. 708, 1758, is Mediterannean. It has two or three 

 times as many radial folds and carinal nodules as the varie- 

 t}^ americajia. 



Genus SPIRULA Lamarck 



australis Lamarck, iVnim. s. Vert. 7, p. 600, 1822; Encycl. Me'th., 

 pi. 465, f. 5, a,b; Dall, Science, n. s., 3, pp. 243-245, 1896; 

 Dall and Simpson, Bull. U. S. Fish Com., i, p. 359, pi. 56, 

 f. 4, 1901. 



spirula Linnseus, in part. 



peroni (Lamarck) Dall, Bull. 37, U. S. N. M., p. 174, pi. 

 68, f. 4, '89. 



Distribution. — Pelagic. West Indies and the Gulf of Mex- 

 ico, shells being washed ashore along West Florida coast 

 and at Cameron, La.. Galveston and Corpus Christi, Texas. 

 A specimen with all the soft parts was also taken from the 



