new Gastropoda from the Persian Gulf, &e. 301 
Watson (cf. ‘Challenger’ Report, xv. p. 114, pl. vil. 
fig. 3, a, 6). 
The species before us is exceedingly beautiful and delicate, 
the surface finely sculptured, with the anal slit narrow and a 
millimetre in length. There is some affinity to S. aédonia, 
Watson, from Pernambuco, but our species is far more 
ly conical and the outer lip more prolonged at the 
ase. 
Fossarus (Couthouyta) unicarinalis, sp. n. 
(Pl. XXL. fig. 7.) 
F, testa minuta, anguste umbilicata, oblonga, nivea, pulcherrime 
sculpturata; anfractibus quinque, quorum duo leves, vitrei, globosi, 
apicales, ceteris turritis, undique longitudinaliter tenuiliratis, 
simul ac spiraliter delicatissime striatis, anfractu penultimo 
cum ultimo infra, juxta suturas, conspicue unicarinato; carina 
etiam conspicua circa umbilicum, usque ad basim peristomatis, 
in quo immergitur, succingenda; apertura ovata, peristomate 
nitido, candido, incrassato, planato, margine columellari quoque 
incrassato. 
Long. 3, lat. 2 mm. 
Hab. Arabian Sea, off Bombay, lat. 18° 48’ N., long. 71° 
45! K., 40 fathoms. 
An excessively small pure white Couthouyia, but of most 
distinctive character, the sculpture being remarkably ornate 
and fine. The last two whorls are sharply keeled, and on 
the body-whorl another keeled projection surrounding the 
narrow umbilicus merges at the base with the white, 
thickened, and flattened peristome. Aperture ovate, columel- 
lar margin thickened. 
Adeorbis axiotimus*,sp.n. (Pl. XXI. fig. 8.) 
A, testa paullum depressa, profunde umbilicata, alba, delicata, 
subpellucida; anfractibus 4, quorum apicalis fere immersus, 
minutus, huic proximus anfractus magnopere inflatus, nitidulus, 
ultimo ceteros multum exsuperante, undique, cum penultimo, 
tenuissime longitudinaliter striato; apertura magna, ovato- 
rotunda, labro tenui, simplici, continuo. 
Alt. 75, diam. 2 mm. 
Hab. Gulf of Oman, lat. 24° 58’ N., long. 56° 54’ E., 
156 fathoms. 
Very delicate and subtransparent ; the apical whorl is 
almost immersed and depressed owing to the tumidity of the 
next, which is shining and almost smooth, the last whorls 
being beautifully and finely striate. 
* a&idrios, worthy of honour. 
