92 



BULLETIN 111, UNITED STATES NATIONAL MUSEUM. 



U. S. Bureau of Fisheries Station 2710, off Nantucket, in 984 fath- 

 oms, bottom of green mud. 



In the Transactions of the Connecticut Academy of Sciences 

 (vol. 6, pt. 1, p. 218) Professor Verrih refers to SipJionodentalium teres 

 Jeffreys, three lots taken by the Albatross at U. S. Bureau of Fish- 

 eries Station 2072 in 858 fathoms, at Station 2084 in 1,290 fathoms, 

 and at Station 2115 in 843 fathoms. All these stations are off Nan- 

 tucket. I have not seen these specimens. 



The apical features of this, as well as of most of these small Siphono- 

 dentalia, are often obliterated by the destruction of the very fragile 

 lobes, leaving only a ragged apical orifice, which shows only traces 

 of one or both fissures, or perhaps leaves but a simple round opening 

 where both lobes are evenly broken off. I have selected a specimen 

 for the type other than that used by Professor Verrill to illustrate 

 his "var. of teres," as it is a perfect specimen received since he iden- 

 tified the Bureau of Fisheries material. 



The following table gives the lots in the museum collection: 



1 Type. 



The rather fragmentary character of the specimens at my disposal 

 and the likelihood of obliteration of their apical features, if they ever 

 possessed any, leave me doubtful as to the true subgeneric position 

 of the two following species here placed under Pulsellum. It is also 

 possible that SipJionodentalium occidentale and S. verrilli will prove 

 to be identical when better material is at hand for critical study. 

 S. hvshi is clearly separable from the two just mentioned, but it may 

 be entitled to no more than subspecific rank under any one of several 

 northeastern Atlantic species referred to by Professor Verrill as, in 

 his belief, conspecific with species from our side of the ocean. 



Subgenus PULSELLUM Stoliczka, 1868. 

 1868. Pulsellum Stoliczka, Cret. Fauna of S. India, vol. 2, p. 441. 



This subgenus includes the SipTionodentalia that have a simple 

 apical orifice — that is, unmodified by lobes or slits. 

 Type. — SipJionodentalium lofotense Sars. 



