4i8 DISCOVERY REPORTS 



in the final convolution, perhaps twelve or thirteen in the whole shell. The peripheral edge 

 is rounded and lobulate. On the ventral side, which is concave, the sutural lines are 

 increasingly depressed with the growth of the shell, and the otherwise smooth surface is 

 furrowed with lines converging on the oral aperture, which is situated in a depression 

 and is a strongly arched opening (sometimes furnished with a tooth) at the centre of the 

 inner marginal edge of the final chamber. There is a considerable amount of variation 

 at diff'erent stations in the development of the external ornament and in the relations of 

 length to breadth, but not sufficient, in our opinion, to justify even varietal separation. 



One specimen found at WS 87, where the species occurs most frequently, has the 

 dorsal side smooth, the sutural lines being limbate but almost fiush. The arrangement 

 of the chambers, which is usually obscured by the surface ornament, is easily made out 

 in this specimen. 



A complete series in all stages of growth was obtained at WS 87. There is no marked 

 difference except in the strength of the ornament, which increases with age. 



The dimensions vary between 0-24 mm. length, 0-2 mm. breadth in the smallest 

 specimen found, and 1-4 mm. length, 1-05 mm. breadth in the largest, which is about 

 0-35 mm. in thickness. 



We have pleasure in associating this species, which is perhaps the most striking of the 

 new species of Foraminifera from the Falkland Islands, with the name of Dr Stanley 

 Kemp, F.R.S., the Director of the "Discovery" Investigations. 



Heronallenia (Discorbis) ketnpii occupies rather an isolated position, and a study of 

 further material may necessitate the creation of a new genus.^ It has little in common 

 with other species of Discorbis, and the only species with which we are acquainted having 

 any close affinity is Discorbis pulvimdinoides, Cushman (C. 1910, etc., FNP, 1915, p. 23, 

 pi. vi, fig. 3), which was described by the author from "off Japan, 59 fms." Cushman's 

 species resembles H. (D.) kempiim the structure of the ventral side, but differs in size, 

 number of chambers, and markings. We have recorded some specimens from New 

 Zealand and the Antarctic, with reservations, under the name D.piilvinoides'^ (H.-A. & E. 

 1922, TN, p. 206). They may be specifically distinct from D . pulvimdinoides and H. (D.) 

 kempil, as probably are some allied organisms in our collection from other localities 

 (Torres Straits; Stewart Island, New Zealand). On the other hand, the Miocene 

 specimens described by us from the Moorabool River, Victoria, Australia (H.-A. & E. 

 1924, FQM, p. 172), under the name Discorbina pidviiioides," Cushman, appear to be 

 identical with that author's recent specimens from Japan. 



The distribution of Heronallenia (Discorbis) kempii is very interesting. It occurs at 48, 

 depth 105 m., and WS 84, 86, 87, 88, 89, 91, 92, 93, 248, at depths ranging between 

 23 and 191m. The best series of specimens are from WS 86, 87, 88, where it attains 

 splendid dimensions. At most other stations the specimens are small, poorly developed, 

 and very rare. All these stations are situated within an area bounded by Cape Horn, the 



1 This entire paragraph was written in 1929 when the species was described as a Discorbis. For the 

 subsequent change, see final paragraph. 



2 An obvious misprint. 



