408 HENRY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFIC, 



Lagena marginata Walker and Boys var. nov. raricostata 



(PI. 18, figs. 8, 9). 



PI. 18, tig. 8. This looks very like the form figured by Rymer 

 Jones, 1872, p. 52, pi. 19, fig. 19, under the name Lagena vulgaHs 

 Williamson var. striata Montagu, the only apparent difference 

 being that my examples are compressed, and his specimen, I 

 presume, was round in section. The test is slightly compressed 

 near the base, and gradually becomes more so until the orifice, 

 which is fissurine, is reached, at which point the compression is 

 well marked. The one figured has only two costae on each face- 

 of the test ; in the others a central costa is added, but is not so 

 well marked. The carina is well developed. Six occur, one of 

 which is very short, and is an intermediate form between this- 

 and fig. 9. Locality : It occiirs very rarely at Nos. 1, 2, 17, 23. 



PI. 18, fig. 9. Test compressed, carinate. The two chief costae 

 start from the orifice, on both sides of the test, and bend round 

 the convex surfaces of the body of the test, spreading out a little 

 as they approach its base. There are two curved, subsidiary 

 costae on either side of the main ones, and also a straight, short 

 one between them. The keel is slightly pointed at the base, and 

 the internal tube is short and straight. I think this may be 

 taken as a variant of the form last described. Twenty are on 

 the slide. Locality : Chiefly Nos. 18, 19. 



Lagena marginata Walker and Boys var. nov. striolata 



(PI. 18, figs. 10, 11). 



Test compressed, carinate, many riblets running lengthwise on 

 both faces of the test. The orifice is phialine, and varies in the 

 amount of its compression. Nearly all the examples have the 

 spaces between the costae, or riblets, more or less filled with shell- 

 growth, which is of a light yellow colour. The specimens vary in 

 size and the riblets in number, these latter being sometimes- 

 extremely numerous. There are over fifty on the slide, 

 Locality : Chiefly Nos. 17, 19, 28. 



PI. 18, fig. 11. There are four specimens, although not typical,, 

 which I think may be placed with the above. The shell is not so 

 much compressed and the costae become weak as they approach 

 the upper part of the test. The keel is better developed. The 

 one figured is rather broader at the shoulders than the others,. 



