G2 UK<-ENT MADKKI'OKAKIA (.K THK HAWAIIAN ISLANDS AND LAYSAN. 



Besi.lrs tl,,. si..vini.'Ms fniiii whi<-li llic :il».v.> tal.lc is made, there are belonging 

 to the same tironip from 



Station 4(I,S0 11 spedinens. 



Station 407!) 11 J-peeimens. 



Station 3H:55 1 i^peoimen. 



Station 8Sr,(i 6 s^pociniens (young). 



Station .SHOT n specimens ( young). 



34 

 Adeline the 1 -peeimen of Table II (No. 24), the r.O uf Table V. and these 34, 

 makes a total of so speeimens of this variety. 



Local !t;,s. Alcoek's type, oti' Pedro I'.ank (Laecadive Sea), 68tl fathoms. 



Albatross, li •(>-': 



South eoast of Molokai Island: 



Station :is,:\:>: depth, l<l!>-ls:> fathoms: bottom, tine brown sand, mud: tempera- 

 ture, 55' F. ; 1 specimen. 



Pailolo Channel, between Molokai and Mani islands: 



Station nsad; deptli, 127 fathoms; bottom, fine .sand, yellow mud; temperature, 

 66.5=^ F.; t; specimens, small. Station 3857; deptii, 1'27-12<S fathoms; bottom, tine 

 sand, yello" nuid: temperature, <)2.5'^ F.; 5 specimens, small. 



Northeast and nortli coast of Maui Island: 



Station 4079; depth, 143-178 fathoms; bottom, gray sand, foraminifera; tem- 

 perature. 60.8- F.; 11 specimens. Station 4080; depth, 178-202 fathoms; bottom, 

 gray sand, foraminifera; temperature. .■')ti.4- F.; 60 speeimens. Station 4081; depth, 

 202-220 fathoms; bottom, gray sand, foraminifera: temperature, 51. 7^^ F.; 1 specimen. 



Northwest coast of Oaint Island: 



Station 4115; depth. I'.i5-241 fathoms; bottom, coral sand, foraminifera; tem- 

 perature. 55.1 F. ; 1 specimen (the largest obtained). 



The physical conditions luider which this variety thrives best, judging by the 

 Hawaiian specimens. ar(> realized at stations 4079, 4080, 4081, and 4115 ; depth. 178 

 to 241 fathoms; bottom sandy, foraminiferal; temperature between 50*^ and (>0° F. 

 These (Auditions are inactically the same as for typical j>i(voninum, the two varieties 

 occurring together, with intermediate examples. At station 4080, var. puripavo- 

 ■ninuiii, however, is the more abimdant. At station 4081, /;a:yww/«((wi typical is the 

 more abundant. A comparison of the data reganling the two varieties seems to point 

 to the typical form's thriving best in sonunvhat deeper water and at a slightly lower 

 temperature. This does not appear suilicient to account for the differences in form. 

 It has occurred to me that tlie bases of the vari(>ties with converging latei'al edges 

 might be sunk in tlie nmd of the sea bottom, and that the differences in shape maj' 

 thus bo brought about mechanically; l)ut it is ditlicult to prove or disprove .such an 

 hypothesis. 



