vol 

 l«'j: 



• XVI, "I 

 i'M. J 



I'KOCEKDINGS OV 'IMIK NA'IfONAF. MI;SF;UM. 



468 



gether witli sucli rchit i(»iislii|>s ;is iiiiiy be dciiotiMl by ;i sludy of tlic, slicll.s 

 themHolves; and lo leave fbi' another section the (completion of the 

 study of the eonij)aialiv«; anatomy as it may be .sui)])lemented by more 

 material for .snch a study of tliis interest inj; ^roup. 



The lonj;' delay of this paix'i- has been (|uite unavoidabh;, and 1 owe 

 many thanks to (Jcunmissioner M<;I)onald of the U. S. I'Msh (J<uumission, 

 for the jienerous kindness with which he has treated all uuitterH ])(!r 

 tainiiij? to this and all other ])oints of my asso(;iation witli him. Also 

 the most ijrateful icnuMubrances are diu' J)r. W. K. Brooks of the 

 .Johns IIoi)kinH [Jiiiversity — at whose suj^jftestion the stiuly of tin; I'te- 

 i-ojjoda and lleterop(»da by sei'ial sections was (uitei-ed upon — for the 

 countless advantages enjoyed in his laboratory at the time this subject 

 was undertaken four years ago as one of his students. 



II. I'lIK lliri'Klv'Ol'ODA. 



These collections were taken togc'ther witli tlie rtcropod;! as dis- 

 cussed in the preceding- part of tiiis icpoit, and as illustrated upon 

 Plate- J, where the positions of the vai'ious collecting stations ai'e indi- 

 cated in the outline map. 



lUiteropods, a<'eordingly, eitlu'r alive or n'preserdcd by their eiii|ity 

 shells, were taken at two dredging stations as follows: 



(jharaiiter of hottorii. 



liliio k'"'>- ooze. 

 ( Miih. (>o/,i- 



Date. 



1887. 

 Nov. 28 

 Dec. 5 



And at a series of lour surfncc, collections desciihed as follows; 



The c,oll(?etions contain Init lit tic material, but f lie individual speci- 

 mens are, in nearly <;vcry instance, beautiful representatives of the 

 various genera of this widiily distributed group. Thr<^e genera are 

 represented: Allatit<(^ (Jarinariay ami lanthiiKi.* Of these Atlanta is 

 represented liy about thirty large shells of the species peronii, found 

 in dcixisit at (Iredging station 2751, as>;o(;iate<l with four of tin- delicate 

 shells of some species of Carinaria (besides the I'teropoda taken there). 

 These Carinaria shells also were unilbrmly of good size an<l must have 

 belonged to large sp(;cimens of the living molluscs of the overlying 



*/am</iina is merely a Hjieciiilizcul (jJantropod, Iml lure roiiHidcicd with tlic, pelagic 

 Heteropods fr)r convenience. 



