1901.] MOLLUSKS FROM THE PERSIAN GULF. 449 



Daphxella veneris, sp. u. (Plate XXIV. fig. 16.) 

 D. testa oblongo-gradatul a, delicata, tenui, albo-lactea ; anfractibus 

 8, quorum apicales duo depressi, vitrei, duo his proximi j>>d- 

 cherrime sub lente decussato-canceUati, cceteris ad suturas 

 gradatis, ultimo excepto, irregulariter varicoso-costatis, spiraliter 

 undique arete liratis,liris in ultimo (infract u solum gemm/ulatis; 

 apertura late oblongo-ovata,labro effuso, pauUum incrassato, sinu 

 luto, juxta suturam ; columella recta, candli brevissimo. 

 Long. 9, lat. 8 - 25 man. 



Hab. Gulf of Oman, lat. 24° 05' N., long. 57°25' E. 205 fathoms, 

 mud. 



A peculiarly gradate species, the sculpture being, as in most 

 DaphnellcB, elaborately caneellate as regards the protocouch ; the 

 whorls next to this are irregularly varicose-costate, and are 

 crossed by delicate non-gemmuled spirals ; it is on the last whorl 

 alone, which is slightly effusely ventricose, that these gemmulea 

 appear, which are extremely beautiful microscopic objects. The 

 aperture is wide, outer lip effuse, the sinus, situate just below the 

 suture, being very broad. Canal very short. 



We know no member of the genus which possesses such well- 

 defined gradate whorls, and we consider its refined beauty merits 

 the appellation chosen for it specifically. 



Daphxella xylois l , sp. n. (Plate XXIV. fig. 17.) 

 D. testa delicata, eleganter fusiformi, albida, jlammis longitu- 

 dinalibus vd maculis castanets decorate. ; anfractibus 9|, quorum 

 apicales -~ subvitrei, castanei, sub lente delicate canceUati, ires 

 quoque his proximi obscure longitudindliter varicoso-costati, 

 ceteris planatis, undique pulclwrrime et tenuissime Jiloso-can- 

 cellatis, ad juncturas yemmuliferis, ultimo anfractu caderos 

 magnitudiue exosquante ; apertura alba, oblonga, labro tenui, sinu 

 (in apeciminibus nostris) hand cemendo ; columella tenui, candli 

 brevissimo. 

 Long. 13, lat. 4'50 mm. 



Hab. Gulf of Oman. Maskat. 10 fathoms, coral-sand. 

 Most beautifully encircled with microscopic cancellae, which are 

 gemmuled at the points of junction, giving a sericeous appearance 

 to the surface when examined with an ordinary lens of low power. 

 Under a higher objective the protoconch is perceived to be vitreous, 

 most delicately caneellate throughout, the next three whorls 

 possessing coarse varicose longitudinal ribs, the remaining whorls 

 all plane and clouded with flame-like chestnut markings. 



Our specimens are probably not quit*' Eull-grown, for the 

 sinus is not discernible. The outer lip is slightly effuse, columella 



thin, and canal extremely short.' 



1 li'Aov, wood, from tho grained-like ohestnul markings. 



» Of the twenty- desoribed by Mr. Edgar Smith 



mainly in 181 >■<! for which, in the earlier pari of this paper, we have 



{jiven me i.-t of the references, the following only do not ooour in our Catalogue, 

 all having been collected l>> Ool, ivlly «it!i the locality " Persian Gulf," and 



Pboc. Zool. Soo.— 1901, Vol. II. No. XXIX. 29 



