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



There are several' examples which have a short neck and the 

 orifice carrying a short spine at either side. Three or four 

 specimens are similar to the one figured by Mr. Millett in his 

 Malay Report, 1901, p. 496, pi. 8, fig. 18. 



Lagena marginata Walker and Boys sp. (PI. 16, figs. 17-20, 



fig. 18, trifacial form). 



" Serpula {Lagena) marginata" Walker and Boys, 1784, p. 2,. 

 pi. 1, fig. 7. 



This species is exceedingly well represented in these gatherings, 

 and in one form or another is found at nearly all the stations. 

 The shape of the body of the test varies from flattened to globular, 

 and in outline from circular to elongate-pyriform, the carination 

 from a fine ridge to a very broad wing. The situation and form 

 of the orifice are variable. Apiculate examples are present and 

 some have the keel acuminate at the base. 



PI. 16, fig. 17. This agrees fairly well in outline with Fissurina 

 paradoxa Seguenza, 1862, pi. 2, fig. 7. The Fissurina bicaudata 

 Seguenza, 1862, pi. 2, fig. 16, is also represented, and it is difficult 

 in some cases to separate this from L. staphyllearia. 



PI. 16, fig. 18. A trifacial form. If anything, the three faces 

 of the body are somewhat concave ; one would rather expect them 

 to be convex, judging from trifacial examples that occur in other 

 species. The specimens vary very little. Locality ; Nos. 2-4, 

 8-10, 14, 15, 22, 29, 34, 36, 39, 40. 



PI. 16, fig. 19. The edge of the test is flattened, the orifice 

 fissurine. In some positions it has the appearance of being 

 slightly bicarinate, but I do not think it is so. Locality : Nos. 

 42, 43. 



PI. 16, fig. 20. This minute variety has a comparatively large 

 orifice, which is much compressed and opens out on one side of 

 the median line ; the tube is attached to the back of the test, 

 which is very slightly carinate. The test is moderately com- 

 pressed and curiously tucked in at its base. The specimens are 

 mixed with others very similar to them, but which have the 

 orifice central and the tube short and straight. There are other 

 forms on the same square, so I cannot give the exact localities. 

 The two forms mentioned are rare. Both were found at a station 

 later in the series than ISTo. 22. 



