141 Bulletin 38 



CLASS CEPHALOPODA 

 ORDER DIBRANCHIATA 



Genus ARGONAUTA Lmnseiis 



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

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

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



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

 south to the Antilles and doubtfulh^ to Brazil. Gulf of 

 Mexico, West Florida region. 



Note. — The typical Argovauta argo Linnaeus, Syst. Nat., 

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

 times as man}^ radial folds and carinal nodules as the varie- 

 ty aviericajia. 



Genus SPIRULA Lamarck 



aisstralis Lamarck, Anim. 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 Linnaeus, 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 



