POLYMORPHININAE 397 



A few specimens which may perhaps be referred to d'Orbigny's species, characterized 

 by a few widely separated costae. D'Orbigny's name has no specific value, the shells 

 being merely variants of U. pygmoea. 



Length, about 0-30 mm. 



The Type was not to be found in Paris. 



300. Uvigerina striata, d'Orbigny (Plate XII, fig. 31). 



Uvigerina striata, d'Orbigny, 1839, FAM, p. 53, pi. vii, fig. 16. 



Uvigerina teiiuistriata (non Reuss fide Cushman), Bagg, 1908, FHI, p. 151 (no fig.;. 



Uvigerina striata, Cushman, 1910, etc., FNP, 1913, p. 94, pi. xliii, fig. 5. 



Nine stations: 48; WS 84, 87, 91, 92, 93, 98, 246, 408. 



D'Orbigny's species was described from the Falkland Islands. He does not refer to 

 its frequency. We have a few specimens referable to his form, which is distinguished by 

 its doubly-pointed extremities. The best one from WS 93. It cannot be described as 

 common and must not be confused with U. striata, Costa (C. 1853, etc., PRN, 1856, 

 p. 266, pi. XV, fig. 3), which is a form of U.pygmaea. The specimen figured by Cushman 

 {lit supra) is more coarsely costate than the d'Orbignyan figure suggests. The Type tube 

 in Paris, labelled "Patagonia", contains one specimen. This, while conforming to d'Or- 

 bigny's drawing in some respects, e.g. the spindle shape acutely pointed at both ends, 

 differs from it in the lesser inflation of the chambers. It is, in fact, one of the many 

 varieties of U. angulosa occurring in the Falkland area, characterized by sub-angular 

 edges, slightly inflated chambers and very fine striation. Another tube, labelled merely 

 "Amerique meridionale ", contains one of the very finely striate forms of U. angulosa 

 and two of the variety separated as U. bifiircata. 



Length, up to o-8o mm.; breadth, 0-30 mm. 



301. Uvigerina angulosa, Williamson (Plate XII, figs. 32-39). 



Uvigerina angulosa, Williamson, 1858, RFGB, p. 67, pi. v, fig. 140. 

 Uvigerina angulosa. Chapman, 1914, EDRS, pp. 32, 44, pi. iii, fig. 22. 



All stations with the exception of 236 and WS 72, 78, 79, 94, 243. 



This is one of the most characteristic species of the Falkland area, often occurring in 

 enormous numbers and ranging up to i-o mm. or more in length; moreover it is poly- 

 morphic, and any attempt to separate its variations in the fashion so prevalent to-day 

 would end in the production of quite a number of new species. The variations depend, 

 primarily, on the size of the primordial chamber. In the microspheric form the pro- 

 loculum is followed by a closely aggregated bunch of chambers and the complete test is 

 short and broad. In the megalospheric test the earlier chambers are much more elon- 

 gate, and result in a long drawn-out test almost parallel sided in the central part of its 

 length. At nearly all the stations both the long and the short form occur in company. 

 The long (or megalospheric) test usually predominates, often almost to the exclusion of 

 the microspheric. At a few stations, notably WS 99 and 217, the short (or microspheric) 

 form is more abundant. Very long individuals occur at WS 83,84,86,87,88,91,92,93. 



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