Bay of Bengal and the Arabian Sea. 7 
A small white species, without any striking features. 
The spire is somewhat prominent and the umbilicus without 
any callus within. ‘The single specimen was dredged dead, 
without the operculum. It “has much the general ¢ aspect of 
the British N. Montaguz, but has no trace of an umbilical 
callus. 
Sigaretus parvus. (Pl. I. fig. 10.) 
Testa parva, depressa, obliqua, auriformis, minute perforata, tenuis, 
albida, epidermide flavescente plus minus induta; spira brevis, 
apice minuto fusco terminata ; anfractus 4, convexiusculi, supe- 
riores duo spiraliter tenuissime striati, ultimus liris spiralibus 
filiformibus subconfertis undulatis circa medium planulatis in- 
structus, lineis incrementi arcuatis conspicuis sculptus ; apertura 
obliqua, ovata ; peristoma tenue, marginibus conniventibus, callo 
tenui junctis, columellari paulo incrassato, reflexo, umbilicum 
minutum fere obtegente. 
Diam. maj. 124 millim., min. 9, alt. 10; apertura 83 longa, 63 lata. 
Hab. Station 170, off Coromandel coast, in 107 fathoms. 
Of a different form to that of S. tener a also from the Bay 
of Bengal. 
Bathybembix Wood-Masoni. (PI. I. fig. 11.) 
Testa imperforata, solida, pyramidalis, sub epidermide tenuissima, 
dilute fusco-grisea, alba, submargaritacea, ad peripheriam acute 
carinata; spira acute conica, lateribus fere rectis; anfractus 
9-10 ?, lente accrescentes, superiores fere plani, supra suturam 
levissime concavi et tuberculis minutis acutis ornati, tres ultimi 
haud tuberculati, striis incrementi obliquis regularibus sculpti, 
ultimus leviter convexus, sed prope carinam paulo concavus, infra 
convexiusculus, striatus, circa regionem umbilici earina obtusa 
instructus ; apertura obliqua, longit. totius 2 subeequans ; peri- 
stoma leviter incrassatum, album, levissime expansum, margine 
columellari fortiter reflexo, appresso, callo lato albo superne labro 
juncto; operculum tenue, corneum, anfractibus decem. 
Diam. maj. 25 millim., min. 22, alt. 23. 
Hab. Station 150, off Northern Maldive Atoll, 719 fathoms. 
This is rather solid for a deep-water form, and the thickness 
of the calcareous layer above the nacre is sufficient to almost 
conceal it. However, in certain lights a slight iridescence is 
observable. The tubercles upon the upper whorls have the 
appearance of minute denticles overhanging the suture, which 
gradually pass away upon the penultimate whorl. In the 
* Smith, Ann. & Mag, Nat. Hist. 1894, vol. xiv. p. 165, pl. iv. fig. 8. 
