HENRY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFIC. 405 



Lagena quadrata Williamson sp. (PI. 17, figs. 26-28). 



Entosolenia marginata var. quadrata Williamson, 1858, p. 11, 

 pl. 1, %. 27. 



This is only occasionally met with in the collection, but several 

 variations are of interest. Both the form with the rounded edge 

 and that which is slightly carinate occur, Localities : Various. 



The partially carinate form, similar to the Challenger figure, 

 pl. 59, fig. 16, is frequent at locality No. 19, and very rare at 

 three other stations. 



Pl. 17, fig. 26. There are only three of this curiously hooded 

 variety. The test is slightly curved and the tube is attached to 

 the back. Except for the bending of the test it is almost 

 identical with Balkwill and Millett's drawing, 1884, pl. 1, fig. 11. 

 Locality : Exact stations uncertain. 



Pl. 17, fig. 27. The two spines, one at either side of the orifice, 

 appear to be round, and not flattened, as one would expect. Five 

 examples are in the "quadrate " condition, and three others have 

 the sides of the test slightly convex and are not so elongate. 

 Locality : Five found at No. 11, two at No. 13, one at No. 18. 



Pl. 17, fig. 28. A single specimen only occurs, having a well- 

 marked keel at each end of the test. The orifice is placed at the 

 junction of the keel with the body. Locality : No. 3. 



Lagena marginata Walker and Boys (Pl. 17, figs. 29-31, 



and Pl. 18, figs. 1-3). 



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

 pl. 1, fig. 7. 



This species is splendidly represented in these gatherings. 

 There is great variation both in size and shape, and also in the 

 development of the carina, which in many examples completely 

 encircles the body of the test and in others is confined to the 

 base. Intermediate forms occur. In a few cases the body of the 

 test, as well as the carina, is apiculate. 



The entosolenian tube is generally attached to one face of the 

 test, but in some instances it is short and straight. The orifice 

 likewise varies in character and position. The body is frequently 

 decorated, in various ways, as in L. orhignyana. One or two 

 examples are very near to Fissurina hicaudata Seguenza, 1862, 

 pl. 2, fig. 16. The following are interesting variations: 



