114 DISCOVERY REPORTS 



230. Lagena mackintoshiana, sp.n. (Plate IV, figs. 14, 15). 

 Two stations: WS 27, 33. 



Test pear-shaped with a produced and regularly tapering neck. From a small basal 

 ring some 10-12 very feeble flattened costae radiate and extend to the base of the neck 

 where they coalesce. These costae, which are so slightly elevated above the body of the 

 shell as to be visible only with very oblique illumination, are decorated with a chain of 

 depressed pits. The surface between the costae is covered with similar pits less regularly 

 arranged. Length o-6 mm., breadth 0-3 mm. 



Only a few specimens, all but one in a poor state of preservation. It is possible that in 

 the perfect condition the whole of the ornament is enclosed by an outer pellicle or skin, 

 as in L. scottii, Heron- Allen and Earland (H.-A. and E. 1922, TN, p. 150, pi. vi, figs. 



3-4). 



Apart from this conjecture the affinities of the species appear to lie near L. torqiiata, 

 Brady (B. 1884, FC, p. 469, pi. Iviii, fig. 41). 



This species is named after Dr N. A. Mackintosh of the Discovery staff. 



231. Lagena macroptera (Seguenza) (Plate IV, figs. 6, 7). 

 Fissurina macroptera, Seguenza, 1862, FMMM, p. 70, pi. ii, iig. 44. 



One station : WS 429. 



The single specimen which we figure appears to agree sufficiently well with Seguenza's 

 description and illustration to justify the revival of a name which has apparently never 

 been used by any subsequent author. In the specimen from South Georgia the keel is 

 somewhat narrower and the test more compressed than the original figure would suggest. 

 Length 0-25 mm., breadth 0-13 mm. 



The species appears to have affinities with L. marginata. Sidebottom (S. 1912, etc., 

 LSP, 1912, p. 406, pi. xvii, fig. 29) figures a very similar form under that name, but his 

 figure does not suggest the hyaline texture of our specimen. It cannot be confused with 

 L. margiiiato var. semimargbiota, Reuss, in which the carina is confined to the oral 

 extremity of the shell round the produced neck. 



232. Lagena marginata (Walker and Boys) (F 221). 



Fifteen stations: 123, 144, 149; WS 25, 27, 33, 37, 48, 66, 314, 357, 418, 429, 521, 522. 



Never very common, often represented by one or two specimens only. Not a single 

 specimen with a fully developed carina was seen, the usual type being a somewhat 

 globose fissurine form with only a suggestion of a keel. 



At a few stations the carina is better developed, a feature apparently accompanied by 

 a flattening of the test. The most highly carinate individuals were seen at WS 25, 33, 

 418 and 429, but the carina is always feebly developed. 



233. Lagena marginata var. quadricarinata, Sidebottom (Plate IV, fig. 41). 



Lagena staphyllearia var. quadricarinata, Sidebottom, 1912, etc., LSP, 1912, p. 404, pi. xxi, 

 fig. 16. 



