LAGENIDAE 151 



The variety differs from the type only in a surface decoration of extremely fine striae, 

 and would be hardly worth separating but for the fact, to which Schubert draws atten- 

 tion, that L. globosa is notorious for the glassy smoothness of its surface. Schubert's 

 specimens were from a fossil Globigerina ooze in the Bismarck Archipelago, New 

 Guinea, and he attributes the markings on his variety to their deep-water habitat. But 

 the Discovery specimens are from shallow water, and though there are abundant 

 specimens of L. globosa from the deep-sea stations, they are all typically glassy and 

 smooth. 



344. Lagena gracilis, Williamson (F 185) (SG 218). 



Fifteen stations: 170, 175, 194, 196, 384-6; WS 204, 387, 395, 403, 468, 482, 505, 506. 

 Always very rare except at the deep-water stations 385 and 386, where it is frequent. 

 Most of the specimens are of a short coarse type, with few costae. 



345. Lagena gracillima (Seguenza) (F 177) (SG 219). 

 Nine stations: 185, 206, 3S3-6; WS 394, 403, 476. 



Only single specimens, except at Sts. 384, 385 and 386, where many excellent ex- 

 amples were obtained. These stations are all in the deep water of the Drake Strait. The 

 specimens found at Sts. 185 and WS 394 are of the curved form figured by Brady, and 

 referred to in the Falklands (F 177) and South Georgia (SG 219) reports. 



346. Lagena guntheri, sp.n. (Plate VI, figs. 53, 54). 

 Two stations: 384; WS 469. 



Test in the form of a pear-shaped flask, thick-walled, more or less acutely pointed at 

 the oral extremity. From a basal ring stout costae, 6-8 in number, run up the sides of 

 the test for three-quarters of its length, then arch over and join. The intercostal spaces 

 are concave. Above the arches, where the costae coalesce, a single row of hexagonal pits, 

 equal in number to the costae, forms a ring round the neck of the flask, and above this 

 ring the test ends in a blunt oral extension with central aperture. 



Length 0-22 mm.; breadth and thickness o-i6 mm. 



Several good specimens at St. 384, one less typical at St. WS 469 ; both stations are in 

 deep water in the Drake Strait. The species is associated with the name of E. R. Gunther, 

 M.A., of the Discovery staff. 



L. guntheri is a distinctive modification of L. acuticosta, Reuss, its nearest ally. The 

 single row of hexagonal pits suggests afiinities with L. williamsoni and L. vilardeboana . 

 All these species are no doubt zoologically nearly akin. 



347. Lagena hartiana, Earland (SG 220). 

 Three stations: 385, 386; WS 403. 



Two good specimens from each of Sts. 385 and 386, and another from St. WS 403. 

 They all come from deep water in the Drake Strait and Scotia Sea. St. 386 is outside 

 the Antarctic convergence line. The number of costae in this species appears to be 

 subject to variation, one of the specimens from St. 386 having only three costae; all the 

 others have the normal five. 



