664 MESSES. E. IIEEON-ALLEN AND A. EAELAND ON THE 



fore belong to the group oi L. variolafa [^chXuvahex^ex). In themselves they consist 

 of two well-marked and distinctive groups which never merge, and seldom show any 

 variation from the types which we figure. The first or biconvex group resembles 

 Schlumberger's figure except for the fact that the keels are poorly developed, and the 

 perforations are much more numerous and more irregularly disposed all over the two 

 faces of the test, which are strongly curved, so that in section the test represents 

 a biconvex lens. The second or complanate group resembles Millett's figures of 

 L. marginato-perforata, except in the fact that the Malay specimens have a margin 

 consisting of a thick rounded edge, while the majority of the Kerimba shells have 

 a triple carina with the median keel considerably more developed than the outer 

 ones, which are really no more than a thickened border round the test, the two faces 

 of which are nearly parallel or but slightly convex. 



The distribution of the two groups presents curious features, for, while both the 

 biconvex and the complanate groups occur together at most of the Stns., the number 

 of specimens is often disproportionate, and at some Stns. one or other of the groups is 

 entirely absent. Thus at Stns. 1, 2 6, 3, and 4, both forms occur in abundance and 

 in practically equal numbers. At Stns. 5 and 6 only the complanate type is found ; 

 at Stn. 11 the biconvex form is very common, the complanate very rare, although it 

 furnished the only trigonal specimen noticed in the gatherings. At Stn. 12 only the 

 biconvex form appears, while at Stn. IX the biconvex form is frequent and the 

 complanate very rare. On the whole, it may be said that the biconvex or coarsely 

 perforate normal L. orhignyana type is the commoner and more constant variety in 

 these dredgings. 



273. Lagena staphyllearia (Sch wager). 



Fissurina staphyllearia Scliwager, 18fi'6, FKN. p. 209, pi. v. fig. 24. 



Layena vulgaris, var. spiriicosta-marginata Rymer Jones, 1872, LJS. p. 57, pi. xis. figs. 34-36. 

 „ staphyllearia Brady, 1884., FC. p. 474, pi. lix. figs. 8-11. 



Egger, 1893, PG. p. 331, pi. x. figs. 50, 51, 99. 



Millett, 1898, etc., FM. 1901, p. (U9, pi. xiv. fig. 2. 



Sidebottoin, 1904, etc., RFD. 1906, p. 8, pi. i. figs. 18-20. 



1 Station. 



One typical specimen at Stn. 3. 



274. Lagena radiato-marginata Parker & Jones. 



Lagena radiato-marginata Parker & Jones, 1865, NAAF. p. 355, pi. xviii. fig. 3, 

 Fissurina radiato-marginata Seguenza, 1879-80, FTR. p. 136. 

 Lagena radiato-marginata Brady, 1884, FC. p. 481, pi. Ixi. figs. 8, 9. 

 Millett, 1898, etc., FM. 1901, p. 622. 



2 Stations. 



A few specimens only at each Stn., presenting no abnormal characteristics. 



