114 DISCOVERY REPORTS 



Heterohelicidae, very far away from Spiroplectammina, Cushman, 1927, which is with 

 the arenaceous Textulariidae. He has since then, in the second edition of his book 

 (C. 1933, F, p. 1 14), removed Spiroplectinata to the VerneuiUnidae, stating that the early 

 chambers are triserial. In this view he is in disagreement with the original authors, and 

 with Chapman. I agree with their view that the early chambers are spiral. 



In any case the distinction between Spiroplectella and Spiroplectinata is complete. If 

 Cushman 's later interpretation is correct, the two are widely separated; if it is not, we 

 have two closely allied genera in one of which, Spiroplectella, the edge of the spiral faces 

 the edge of the remainder of the test, in the other, Spiroplectinata, the edge of the spiral 

 is towards the face of the test. 



225. Spiroplectella cylindroides, sp.n. (Plate IV, figs. 36-38). 

 One station: 360. 



Test minute, arenaceous, commencing with a spiral having 4-5 chambers in the outer 

 convolution, followed by 2-5 pairs of chambers on a textularian plan, and ending with a 

 straight series of uniserial chambers, up to nine in number, and circular in section. The 

 spiral portion is only a little wider than the textularian series, and from its junction there 

 is a very gradual increase in width to the oral extremity. The whole test resembles a 

 stout cudgel marked with rings (the sutures), and slightly flattened and expanded at one 

 end (the spire). Sutural lines distinct, slightly depressed, and often darker in colour 

 than the walls of the chambers. Oral aperture simple and terminal, sometimes on a pro- 

 duced nipple. Constructed of very fine mineral grains with excess of cement. Colour 

 ferruginous brown of varying degrees of intensity, usually dark. 



Length o-3-o-4 mm. ; width at spiral o-o5-o-055 mm., at final chamber o-o5-o-o6mm. 



About a dozen specimens were found in the sounding from St. 360, so the species 

 must be of frequent occurrence there. It was not seen at any other station. Apart from 

 its trimorphous development it has structural differences when compared with Spiro- 

 plectammina filiformis, to which it bears some superficial resemblance. The spiral portion 

 is less prominent, the increase of width of chambers much more gradual, and it uses 

 fewer and finer mineral grains in its construction. 



Sub-family TEXTULARIINAE 

 Genus Textularia, Defrance, 1824 



226. Textularia gramen, d'Orbigny (F 119). 

 One station: WS 204. 



A single small specimen from 3328 m. in the Scotia Sea. 



227. Textularia paupercula, sp.n. (Plate V, figs. 27-29). 

 Eight stations: 169; WS 377, 496, 497, 506, 512, 513, 516. 



Test minute, rather compressed, about three times as broad as long, consisting of 

 4-6 pairs of chambers gradually increasing in size, sutures obscure, slightly depressed, 

 marginal edge rather sinuous, aperture normal. Constructed of fine sand without 

 visible cement ; wall thin and fragile ; surface rather rough ; colour light grey. 



Average length 0-25 mm. ; greatest breadth o-i2 mm. ; thickness 0-07 mm. 



