DEEP-SEA CONOIDEAN GASTROPODS 



17 



notch (characteristic for mature individuals of Gemmula - see 

 Kantor & Sysoev, 1991) in one of the shells (H = 20.2) indicates 

 that the mentioned shell size characterizes adult specimens of G. 

 amabilis. 



Distribution. North-western Indian Ocean, 494-2000 m; also 

 probably from north-western Australia, 300-496 m. 



Gemmula (Gemmula) cf. congener (E.A.Smith, 1894) 



Pleurotoma congener E.A.Smith, 1894,p. 160—161, pi. 3, figs4, 5. 

 Gemmula congener subspecies congener (E.A.Smith) - Powell, 



1964, p. 251-252, p. 191, figs 1^1; Cernohorsky, 1987, p. 



123-124, figs 1, 2-3 (holotype), 4-5. 



Type locality. Bay of Bengal, 128 m. 



Material, stn 176, 1 shell. 



A single broken and heavily worn shell (H = 39.6 mm) can 

 probably be referred to G congener by its very strong 

 gemmulated subsutural fold. 



Distribution. Indian Ocean, 198-732 m. 



Subgenus UNEDOGEMMULA MacNeil, 1960 



Type species: Pleurotoma uneclo Kiener, 1839^40 (original 

 designation) 



Gemmula ( Unedogemmula) unedo (Kiener, 1839-1840) 



Fig. 75 



Pleurotoma unedo Kiener, 1839-1840, p. 19, pi. 14, fig. 1 . 

 Gemmula (Unedogemmula) unedo (Kiener) - Powell, 1964, p. 



269-270, pi. 175, figs 1, 6, pi. 208, figs 1, 2; Kosuge, 1988, p. 



121-122, text-figs 4, 13-15, pi. 47, figs 9, 10. 

 Pleurotoma invicta Melvill, 1910, p. 15, pi. 2, fig. 27. 



Type locality. 'Mers de lTnde' (unedo), Persian Gulf 

 (invicta). 



Material, stn 145, 1 specimen. 



The shell from stn 145 is peculiar in the complete absence of 

 spiral sculpture on the body whorl. The sculpture is represented 

 only by very rough growth lines which is probably a senile 

 abnormality. 



Distribution. Persian Gulf to Japan, 73-503 m. 



Subgenus PTYCHOSYRINX Jhide, 1925 



Type species: Pleurotoma (Subulata) bisinuata von Martens, 

 1901 (original designation) 



Gemmula ( Ptychosyrinx ) bisinuata (von Martens, 1901) 



Figs 72-74 



Pleurotoma (Subulata) bisinuatavon Martens, 1901, p. 17. 

 Drillia (Subulata) bisinuata (von Martens) - von Martens, 1903 



[1904], p. 82, pi. 1, fig. 8. 

 Ptychosyrinx bisinuata (von Martens) - Thiele, 1925, p. 



176(210), text-fig. 28 (rad.), pi. 46(34), fig. 28 (opera); Powell, 



1964, p. 289-290, pi. 223, figs 1,2. 

 Gemmula (Ptychosyrinx) bisinuata (von Martens) - 



Cernohorsky, 1987, p. 130, figs 15-17. 



Type locality. 'Valdivia', stn 264, near the coast of Somalia, 

 1079 m. 



Material, stn 1 19, 1 specimen and 1 shell; stn 184, 1 specimen. 



The species is rather similar to the closely related G teschi 

 (Powell) (see below). The main differences are that, in G 

 bisinuata, the subsutural rib is clear, thin, straight or slightly 

 wavy, without nodules; the sutures are poorly seen and very 

 shallowly impressed. In G teschi, the subsutural rib is very 

 weakly developed or absent (or there is a weak to moderate 

 subsutural fold), covered with nodules which are the 

 continuation of axial folds; the sutures are clear, more or less 

 channelled. Additionally, the spiral ribs on the shell base in G 

 bisinuata are clear and prominent; two lower ribs out of three 

 upper ones are much stronger than the other. In G teschi, the ribs 

 are thinner, more uniform, more numerous and closely spaced; 

 the shell base is evenly convex. 



Distribution. East Africa from the Gulf of Aden to 

 Malagasy, 818-1463 m. 



Gemmula (Ptychosyrinx) teschi (Powell, 1964) 



Figs 68-70 



Ptychosyrinx timorensis teschi Powell, 1964, p. 291-292, pi. 223, 

 figs 5, 6; Abbott & Dance, 1990, p. 238, fig. (holotype). 



Type locality. 'Albatross', stn 5587, NW of Sipadan Id., 

 Borneo, 415 fms. 



Material, stn 1 18, 6 specimens. 



Although having been described as a subspecies, G teschi 

 obviously warrants specific rank from the fossil G. timorensis 

 (Tesch, 1915) in having a much broader fusiform shell. The 

 specimens from the JME material vary in the prominence of 

 spiral ribs on the shell base and the number of peripheral 

 tubercles ( 1 7-22 on the body whorl, mean 19). In no specimen is 

 the subsutural fold as strong and regularly gemmate as in the 

 holotype. 



Distribution. Indonesia and Zanzibar, 635-1789 m. 



Figs 63-75 Gemmula spp. 63-65 -Gemmula (Gemmula) vagata (E.A. Smith, 1895), stn 1 76 (63, 64) and 188 (65), H = 48.9(63), 33.3 (64) and 36.3 

 (65) mm; 66, 67, 71 - G. (G ) amabilis (Jickeli in Weinkauff, 1875), stn 193 (66), 34 (67) and 145 (71), H = 25.8 (66), 23.3 (67) and 21.3 (71) mm; 

 68-70 - Gemmula (Ptychosyrinx) teschi (Powell, 1964), stn 1 1 8, H = 28.2 (68), 27.5 (69) and 24.7 (70) mm; 72-74 -G. (P.) bisinuata (von Martens, 

 1901), stn 1 19 (72) and 184 (73, 74), H = 18.8 (72) and 30.5 (73, 74) mm; 75 - Gemmula (Unedogemmula) unedo (Kiener, 1839-40), stn 145, H = 

 95.5 mm. 



