LAGENIDAE 153 



Cushman's species is one of the double-walled Lagenae, and very similar in struc- 

 ture to L. chasteri, Millett (M. 1898, etc., FM, 1901, p. 11, pi. i, fig. 11), though much 

 thinner. The external layer of an undamaged specimen is very finely vesicular, but 

 smooth and shining. It appears to consist of innumerable little prisms or spines set 

 closely together on the surface of the inner shell. When the outer shining layer is 

 damaged either in places or entirely, the inner shell is seen to be dull like ground glass, 

 sometimes faintly hispid where the prisms remain undamaged. The neck is thick and 

 solid looking, and when the surface layer is removed the fine undergrowth is very readily 

 seen. The figures show the structure better than any description. Specimens of every 

 shape, from globular to elongate oval, were found in all conditions between the un- 

 damaged shells, and those in which the outer covering had entirely disappeared. 



352. Lagena inornata (d'Orbigny) (F 175). 

 Two stations: WS 393, 482. 



A single good specimen at each station. 



353. Lagena johni, sp.n. (Plate VI, figs. 61-63). 

 Five stations: 383-6; WS 403. 



Test hyaline, cordate, somewhat compressed, lateral edges rounded; walls rather 

 thick, becoming solid at the slightly produced oral extremity which has an entosolenian 

 tube. The upper half of the test is smooth, the lower half deeply sculptured into a series 

 of arches, from the sides of which sharp carinae extend downwards beyond the base, 

 more or less concealing two large diverging auricles situated on the base. 



Length varies up to 0-40 mm.; breadth up to 0-30 mm.; thickness 0-20 mm. 



Rare everywhere, the best and most frequent specimens at St. 384. At this station 

 and at St. 385 the carinae reach their maximum development. At Sts. 383, 386 and 

 WS 403 the carinae are not so prominent. They are very fragile and it is not easy to 

 distinguish specimens in which they have been broken away from those in which de- 

 velopment has been arrested. The species is associated with the name of D. D. John, 

 M.Sc, of the Discovery staff. 



L. johni is allied to L. aiiriculata, Brady, as evidenced by the large auricles on the base. 

 In its sculptured markings it resembles to some extent L. exsculpta, Brady. Its nearest 

 ally is probably L. aiiriculata var. arcuato, Sidebottom (see No. 311), and it is not easy 

 to separate worn examples of L. johni from that variety, except by the absence of the 

 marginal carina which distinguishes Sidebottom's form. 



354. Lagena laevigata (d'Orbigny) (F 169A). 



Oolina laevigata, Galloway and Wissler, 1927, PPLQ, p. 50, pi. viii, fig. 10. 



Five stations: 170, 175, 384, 385; WS 403. 



Single specimens only at the three deep-water stations, 384, 385 and WS 403, and 

 these very small in size compared with those from comparatively shallow water at Sts. 

 170 and 175, where it is more frequent, and the specimens are large and typical. The 

 base is variable, sometimes rounded, at others produced and flattened, often with a 

 central depression which is apparently superficial, and not as might be supposed a 



