398 DISCOVERY REPORTS 



At some of the stations, notably WS 92, 93, 213, 219, 245, the alternation of the shell is 

 carried to such an extent that the final chambers are linear, i.e. it has become a Sagrina. 

 The surface markings show a like range of variation, though the variations are not of 

 very frequent occurrence. The general average of specimens resemble Williamson's 

 figure, but at WS 88 and 91 smooth individuals occur with the type. At WS 97, 109, 

 210, 245, very coarsely sulcate specimens were observed. At WS 91 many of the 

 individuals of the long type had curved tests. Other abnormalities noticed included a 

 specimen at WS 108, in which, in addition to the normal final chamber, an accessory 

 chamber with an oral aperture had budded out from the penultimate chamber (fig. 38). 

 At WS 217, a specimen in which one of the later chambers was ornamented with coarse 

 spines was found (fig. 39). 



302. Uvigerina angulosa var. pauperata, var.n. (Plate XII, figs. 40-43). 



Six stations: 228, 230, 235, 236; WS 408, 433. 



Test minute, trihedral in the later stages, tending to inflation in the earlier chambers. 

 In the arrangement of the chambers, it is similar to the type U. angulosa, presenting a 

 short, broad microspheric and a long narrow megalospheric form. The surface of the 

 chambers is marked with feeble intermittent costae, between which the surface of the 

 shell is weakly hispid. The later chambers are sometimes somewhat undercut, and the 

 final chamber terminates in a well-marked neck with a reverted lip. The aboral end 

 sometimes terminates in a delicate spine. 



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



This is probably only a pauperate form of U. angulosa. It bears a very close re- 

 semblance to that species in the sectional views of its test and the general character of its 

 ornament, but it appears to be separable as occupying a distinct region. All the stations 

 at which it has been recorded lie just outside the continental shelf on which the Falkland 

 Islands stand. The variety is probably almost co-extensive with the type, which it may 

 replace in deeper waters. We have very similar examples from the " Albatross " station 

 2550 (39° 44' 30" N, 70° 30' 45" W) at 108 1 fms, and from Cyprus (beHeved to be a 

 fossil). 



Genus Siphogenerina, Schlumberger, 1883 



303. Siphogenerina dimorpha (Parker and Jones) (Plate XII, fig. 44). 



Uvigerina (Sagrina) dimorpha, Parker and Jones, 1865, NAAF, p. 364, pi. xviii, fig. 18. 



Siphogenerina dimorpha, Egger, 1893, FG, p. 317, pi. ix, fig. 30. 



Sagritta dimorpha, Heron-Allen and Earland, 1916, FWS, p. 266, pi. xlii, figs. 17, 18. 



Seven stations: WS 77, 87, 88, 91, 93, 221, 245. 



Except at WS 87 and 88, the species is represented by single individuals. At these 

 two stations, notably WS 88, it was more abundant, and shewed extraordinary variation 

 in length, ranging from the short type of Parker and Jones with only three final chambers, 

 to a very long individual with no less than nine chambers in the linear series, which was 

 0-95 mm. long, and 0-20 mm. at the maximum breadth. 



