652 OS SOME FOEAMIWIFEEA PROM TRINIDAD, [NoV. 6, 



closely embracing. Sometimes each successive chamber embraces 

 all the previous ones ; in other cases some of the initial chambers 

 are visible as indistinctly marked annular segments. A thread-like 

 ridge, like a flange, surrounds the sphteroid in the direction of its 

 length. This I'idge, which often appears to be double, expands at 

 the larger end of the test, and its two elements separating, leave 

 between them a fissurine aperture. This is an elongated narrow 

 opening between two pouting lips, the lips being a continuation 

 and extension of the ridge or flange. Many specimens show a 

 ridge at right angles to the longitudinal ridge ; but this is produced 

 by the breaking-away of the last chamber at the line of suture. 



This singular organism appears to differ in some essential 

 characters from any roraminifer hitherto known, at least so far 

 as I have been able to find out. It varies in shape from an almost 

 perfect sphere to a sphseroid of very prolate shape, the initial 

 (aboral) end being sometimes a very rounded and blunt projection. 

 The longitudinal ridge is sometimes obsolete towards the aboral 

 pole, sometimes it is single, and occasionally it is triple, the two 

 lateral elements being the most raised. In shape the test resem- 

 bles a very round GlcmduUna, like G. ohtusissima, Keuss (Tert. 

 Foram. Fauna, 18(33, pi. viii. fig. 93 ; also G. globulus, figs. 94, 95), 

 or G. abbreviata, Neug. (Sherborn and Chapman, London Clay 

 Toram., Journ. Microsc. Soc. 1886, pi. xiv. fig. 20), or a Lacjena 

 like L. obtusa, Egg. (Eeuss, ' Lagenideen," 1862, pi. vii. figs. 92, 93). 

 The test is hyaline, glistening, and very fine and close-grained in 

 texture. 



It has only been found in the Ditrujja-hed of Pointapier, Trinidad. 



EXPLAl^JATION OP PLATE XLI. 



Fig. 1. Amphicoryne-form of Nodosaria hispida, D'Orb., var. 



2. Cristellaria aculcata, D'Orb., var. A form found abundantly in the 



Bitrupa-hei of Pointapier, Trinidad. Closely allied to C. wethereUii, 

 Jones, and C.fragaria, Giimb. Cova^av&a^so Mwginulinacristella- 

 rioides, Giimb. For comparison with fig. 1. 



3. Frondiciclaria complaiiata, Defr. Flabelline variety showing Cristel- 



larian initial portion. 



4. Frondicularia akda, D'Orb. {complanata, Defr.). Specimen showing 



{a) Cristellarian initial portion, and (5) portion reproduced after loss 

 by fracture of the original oral jjortion. 



5. FrondAcmlaria flahclUJormis, n. sp. Usual form. In many specimens 



the ends of the chambers project more than is shown in this drawing 



6. Frondictdaria flabelliformis, n. sp. A thicker and stouter form than 



the preceding. This may be compared with F. spma, Terqueiu 

 (Kupert Jones, ' Monthly Microscopical Journal,' 1876, pi. cxxviii. 

 fig. 24). 



7. Initial segment of Folymo7-phina, comparable with Lagcna c/lobosa, Mont. 



8. 9. Specimens showing the development of Frondicidaria from a 



Polymorphina segment. These may be compared with FlaheUina 

 ponderosa and triqnetra, Terquem (Eupert Jones, ' Monthly 

 Microscopical Journal,' 1876, pi. cxxviii. figs. 25, 26). 



10. Stilostomella rugosa, n. sjj. A specimen with a protuberant neck. 



11. The same. A specimen with a less protuberant neck. 



12. Ellipsoidma suhnodosa, n. sp. 



13. EUi2JS0idina exponens, Brady, MS. 



