TEXTULARIIDAE 95 



A single small specimen from 3780 m. is attributed with some hesitation to this 

 species. It is far from typical, the edges being rounded and the median line depressed. 



155. Textularia wiesneri, sp.n. (Plate III, figs. 18-20). 



Textularia parvula, Wiesner {non Cushman), 1931, FDSE, p. 98, pi. xiii, fig. 152. 



Five stations: 144, 145, 151 ; WS 33; MS 14. 



Test minute, elongate, often twisted, consisting of between eight and fourteen pairs of 

 rather inflated chambers. Sutures flush at commencement, becoming depressed. Edge 

 lobulate, especially at the oral end. Built of fine sand with much cement. Aperture a 

 normal transverse slit. Colour brown. Length up to 0-4 mm., breadth 0-12 mm., 

 thickness 0-07 mm. 



Wiesner {lit supra) figures a small Textularia, which does not agree with Cushman 's 

 description or figures of T. parvula, but represents admirably a species which occurs 

 both in South Georgia and in the Antarctic material, and is therefore probably widely 

 distributed over the whole Antarctic area, as Wiesner's records are from the opposite 

 side of the Antarctic Continent. He records the discovery of both megalospheric and 

 microspheric specimens. 



Cushman figures both stages of T. parvula. His figure purporting to represent the 

 microspheric form is very similar to Wiesner's figure and our own megalospheric form, 

 but his figure of the megalospheric form does not resemble either Wiesner's specimens 

 or our own. Cushman's species is from the Caribbean Sea. 



T. wtestieri is rare, or very rare, in the South Georgian material, most numerous at 

 WS 33. It appears to be more frequent at some Antarctic stations. 



It is not very readily distinguishable, at least in the megalospheric form, from T. 

 tenuissima, as the rounded megalosphere bears some resemblance to the primary 

 spiroplectine coil or planispire of that species. The brown colour, however, is in strong 

 contrast to the silvery grey of T. tenuissima, and of course, when viewed by transmitted 

 light, it is readily distinguishable, owing to its large proloculum and the invariable 

 absence of a primary planispire. 



156. Textularia tenuissima, nom.n. (Plate III, figs. 21-30). 



Textularia elegans, Lacroix, 1932, TPCM, p. 8, figs. 4 and 6 (not fig. 5). 



Twenty-five stations: 15, 30, 42, 45, 144, 149, 660; WS 28, 32, 33, 37, 40, 41, 42, 47, 63-4, 154, 

 334. 343. 348, 349. 353. 429; Drygalski Fjord; MS 68. 



Test minute, very elongate, straight or slightly curved, oval in section, early chambers 

 closely coiled in both megalospheric and microspheric forms, the initial end being 

 rounded in the former and more or less pointed in the latter ; tapering very gradually to 

 the oral extremity, which is the thickest portion of the test, and rounded ; edge straight 

 for the first half of the shell, then becoming slightly lobulate, rounded throughout; 

 chambers very numerous, up to twelve or more pairs following the initial spiral, 

 distinct, regularly increasing in size and thickness, finally becoming slightly inflated; 

 sutures distinct, depressed ; aperture distinct, a curved slit on the inner edge of the 



