HENRY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFIC. 407 



specimens are marked (nob necessarily alike), but there is only 

 -one on the slide. Localitif : Exact station uncertain ; either 

 No. 2 or No. 11. 



Lagena marginata Walker and Boys, var. (PI. 18, 



figs. 4, 5). 



There are a good number of these forms and no line of 

 demarcation can be drawn between them. Nearly all of them 

 have four costae running up the neck, two on either side. Those 

 in which these costae are absent are similar to the Challenger 

 drawing, pi. 59, fig. 6, which, Brady states, " might, with 

 equal propriety, be treated as a mucronate example of L. mar- 

 ginata,''^ and such I take them to be. Several of the specimens 

 might be looked upon as the apiculate form of L. marginata var. 

 seniimarghmta Reuss. Locality : Chiefly No. 29. 



Lagena marginata Walker and Boys var. catennlosa 

 Chapman (PI. 18, fig. 6). 



Lagena maryinata var. catenidosa Chapman, 1895, p. 28, pi. 1, 

 fig. 5. 



After drawing this solitary specimen, I was unfortunate enough 

 i;o break it. There was a good deal of exogenous shell-growth, 

 which interfered with the definition of the chain-like borders 

 which encircle the body of the test, referred to by Chapman. 

 Fortunately, in another set of soundings from the S.W. Pacific, 

 there are four fine examples which I shall hope to figure in the 

 future. The outer circle of chain-work (well raised up), if not 

 the inner one, is on the carina. Locality : Exact station 

 uncertain. 



Lagena marginata Walker and Boys var. nov. umhonata 



(PI 18, fig. 7). 



Test compressed and surrounded with a well-developed carina. 

 A few costae, starting close to the orifice, radiate downwards 

 to the upper part of the body of the test, on both faces. A well- 

 raised " boss," generally ribbed, is placed near to the base on both 

 sides, and free of the keel. Internal tube short and straight. 

 The oral end is oval and the actual orifice a very narrow slit. 

 Twelve examples occur, Locality : Nos. 3, 13, 17. 



