LITUOLIDAE 97 



convolutions are in the form of a hollow cone, with planospiral convolutions following. 

 The distinction appears to be very slight, but the author says that his specimens, which 

 were from the Gulf of Mexico and the Brazilian coast, are not usually associated with 

 Ammodisciis incertiis, from which it differs only in the early cone-shaped whorls. He 

 reports that only the microspheric form has been found. 



The Discovery specimen is immature ; starting with a proloculus more than double 

 the width of the succeeding coil, it has six coils in the cone, which is slightly tilted to one 

 side of the vertical axis ; the cone is followed by three plane convolutions. There is a very 

 gradual increase in the diameter of the successive convolutions throughout. Maximum 

 diameter 0-25 mm. 



Genus Glomospira, Rzehak, 1885 



183. Glomospira gordialis (Jones and Parker) (F 102) (SG 127). 



Thirty-eight stations: 167, 170, 171, 175, 177, 180, 181, 190, 192, 197, 203, 204, 360, 363, 366, 

 369. 373. 383. 385 ; 62° 57' S, 60° 20' 30" W; WS 203, 383, 384, 386, 387, 389, 469, 471, 479, 481-3, 

 487,490,495, 516, 552, 555. 



Almost universally distributed and found at all depths down to 4845 m. It is common 

 at Sts. 177 and WS 482, frequent at Sts. 175, 181, 190, 360, 383 and WS 516, rare else- 

 where. Three different varieties occur, usually at different stations but occasionally to- 

 gether. The most widely distributed is a nearly flat form, only separable from irregular 

 specimens of Ammodisciis incertus by the extreme irregularity of the convolutions ; in the 

 next form the tube is coiled in a tangled mass without any definite plan. It is much less 

 frequent but was noted at Sts. 175, 177, 181, 190, 363 and WS 482. These two forms 

 have an unpolished surface owing to the lack of cement. The third form may resemble 

 either of the others in shape, but is distinguished by the use of an excessive quantity of 

 ferruginous cement which gives a polished exterior to the brown test. It appears to be 

 confined to a few of the deeper stations, most of the records being below 2000 m., 

 although there are single records from 262 m. (St. WS 490) and 843 m. (St. 204). It was 

 frequent at St. 383 in 3744 m., and at St. WS 516 in 261 1 m. Sessile specimens of the 

 first form were recorded at Sts. 190 and WS 482. 



184. Glomospira charoides (Jones and Parker) (F 103) (SG 128). 



Twenty-five stations: 175, 177, 360, 362, 373, 383, 384; WS 203-5, 468, 4^9. 47i. 472, 474, 483, 

 487, 494A, 495, 502, 503, 515-17, 555. 



Widely distributed, generally in deep water, eighteen of the records being from over 

 2000 m. But it is also found in shallower water, and the best and largest specimens were 

 from Sts. 175 (200 m.), WS 487 (790 m.) and WS 494A (1035 m.); only a single speci- 

 men at each of these stations. It is frequent but rather small at Sts. 360 (3264 m.), 

 WS 503 (4072 m.) and WS 555 (3850 m.), rare or very rare elsewhere. 



Genus Turritellella, Rhumbler, 1903 



185. Turritellella shoneana (Siddall) (SG 129). 

 Five stations: 170, 190; WS 481, 482, 494A. 



Two good specimens at St. 170, but only single specimens at the other stations. The 



DX '3 



