NO. 2134. NOTES ON CHRYSODOMUS—DALL. 231 



BUCCINUM SIMULATUM Dall. 



Buccinuni simulatum Dall, Smithsonian Misc. Coll., No. 1727, p. 150, 1907. 

 Petrel Bank, Bering Sea, in 54 fathoms. 



Habitat. — Akkeshi, Yesso. Hirase collection. 



The Japanese specimen differs from that from Bering Sea, in hav- 

 ing the sculpture a little more prominent and the axial plications 

 smaller, more distinct, and numerous. These differences, however, 

 are well within specific limits in this genus. 



BUCCINUM GLACIALE, var. PARALLELUM Dall. 



Tritonhim varinatum Dunkee, Novit. Conch. Moll. Marina, p. 1, pi. 2, figs. 



3, 4, 1858. Not Buccinuni carinatum Gmelin, 1792, or Turton, 1819. 

 Buccinuni angulosum Morch, iu Dunker. Novit. Conch. Moll. Marina, pi. 



2, figs. 3, 4, explanation on plate. Not B. anf/ulosum Gray, 1839. 



This variety of B. glaciale seems confined to the Bering Sea region 

 and many specimens reach a length of 80-85 mm., while I have one 

 95 mm. in length from Atka Island, Aleutians. Mr. Hirase, how- 

 ever, has reached the other extreme by sending a specimen quite ma- 

 ture and characteristic which is probably a male, and measures only 

 26 millimeters long. It is from Iterup Island of the Kuril group. 



Both the names previously given to this variety were preoccupied 

 for other species. 



BUCCINUM STRIATISSIMUM Sowerby. 



Buccinum striatissimum Sowerby, Ann. Mag. Nat. Hist., ser. 7. vol. 4, p. 370, 

 fig. 1, 1899. 



The typical form of this species is the fine large shell figured by 

 Sowerby. In the northern dredgings there are numerous apparently 

 adult shells of a stout and stumpy character, whose thickset appear- 

 ance is increased by the fact that the apex is usually eroded. These 

 on examination prove to be nearly all males, a few immature females 

 forming the exceptions. I showed years ago that in certain species 

 of Buccinv/m the males were usually very much smaller than the fe- 

 males, who have to carry the vast mass of material composing their 

 heaps of agglutinated ovicapsules. This does not seem to be true of 

 all the species of Buccinum, but is markedly so in B. cyaneum and 

 B. hydrophanii/m Hancock, and appears to be so in the case of B. 

 striatissimum. The variety of B. undatum which lives on the coast 

 of New England has two races of males, one of nearly the size of 

 the average female, and another conspicuously dwarfed. 



This small thick male B. striatissimum has such a different aspect 

 from that of the large thin females that it might easily be taken for 

 a dilstinct form. 



