LAGENIDAE 165 



406. Lagena sulcata var. apiculata, Cushman. 



Lagena sulcata, apiculate forms, Brady, 1884, FC, pi. Iviii, figs. 4, 17. 



Lagena sulcata war. apiculata, Cushman, 1910, etc., FNP, 1913, p. 23, pi. ix, fig. 3, (?4); 1918, 



etc., FAO, 1923, p. 58, pi. xi, fig. 2. 



Four stations: 386; WS 205, 403, 468. 



Only a single specimen at each station but all very strongly spinous at the base ; the 

 best at St. WS 468. 



Cushman's description (1910) of his variety, which is not uncommon in deep water, is 

 "Test like typical L. sulcata, but the apical end drawn out into a stout spine; aperture 

 rounded ". Of the two specimens figured only one (fig. 3) seems referable to L. sulcata. 

 Fig. 4 appears to be quite distinctive in the arched loops separating the main costae. 



407. Lagena texta, Wiesner (Plate VII, figs. 31-35). 

 Lagena texta, Wiesner, 1931, FDSE, p. 121, pi. xix, fig. 230. 



Four stations: 170, 175, 200; WS 482. 



This large and striking species was described by Wiesner from a single specimen 

 found in 385 m. off Kaiser Wilhelm's Land (66° 2' S, 89° 38' E). His description is hardly 

 sufficient for identification, and the figure, taken as he explained to me from a " dark field 

 photograph of the dry specimen", lacks detail. I therefore sent him some Discovery 

 specimens, and he has been good enough to confirm their identity. 



A full description of the species seems desirable: test flask-shaped, triangular in 

 section ; narrow at the oral end which is surmounted by a short phialine neck bearing 

 the aperture ; the test increases rapidly in breadth for quite two-thirds of its length, then 

 gradually decreases to the base, which is rounded. 



The three edges of the test are produced into flat cellular wings with truncate margins. 

 These wings are broadest where they meet round the base, and taper away towards the 

 oral end, where they become merged into the facial surfaces below the neck. The three 

 facial surfaces are slightly convex and double-walled, the stout internal wall being 

 covered with low ramifying costae, over which is a delicate and hyaline outer shell. The 

 spaces between the costae form cellules, irregularly fusiform in shape, like the pulp cells 

 of an orange. Their silvery lustre, due to the air contained in them, contrasts strongly 

 with the darker hyaline costae. Wiesner describes the shell as " ornamented with a net- 

 work of irregular elongate-squared meshes ". He does not mention the double wall, but 

 in his letter he agrees as to its presence. 



The facial surfaces of the test are sometimes separated from the cellular wing by a 

 trough, which is broadest round the base of each face, and is due to an interruption of 

 the cellular structure. The width of the wing is variable ; it is apparently a solid structure, 

 pierced by numerous large tubules which open on the truncate margin of the vidng. 



Length up to nearly o-6o mm. ; greatest breadth and thickness up to 0-25 mm. 



L. texta appears to have a very limited distribution in our material, being confined to 

 a few stations in the Bransfield Strait and northwards to Clarence Island. It is not in- 

 frequent at St. WS 482 in 100 m., where the best series was obtained. The greatest depth 

 recorded was 345 m. at St. 200. 



