1901.] MOLLUSKS FEOM THE PERSIAN GULF. 449 



Daphnella venekis, sp. n. (Plate XXIV. fig. 16.) 

 D. testa oblongo-gradatuIa,delu'ata,tenui,albo-lactea; anfractihus 

 8, quorum aj)icales duo depressi, vitrei, duo his proximi pul- 

 cJierrime sub lente decussato-cancellati, cceteris ad suturas 

 gradatis, ultimo excepto, irregulariter varicoso-costatis, spiraliter 

 undique arete liratis, liris in ultimo cmfractu solum genimtdatis ; 

 apertura late oblongo-ovata, labro effuso, p)aullum incrassnto, simi 

 lato, jioxta suturam ; columella recta, canali brevisshno. 

 Long. 9, lat. 'S25 mm. 



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

 mud. 



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

 Daphnella}, elaborately cancellate as regards the protoconch ; the 

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

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

 alone, which is slightly effusely ventricose, that these gemmules 

 appear, which are extremely beautiful tnicroscopic objects. The 

 aperture is wide, outer lip eifuse, 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. 



Daphnella sylois \ sp. n. (Plate XXIV. fig. 17.) 

 D. testa delicata, eleganter fusiformi, albida, fiammis longitu-r 

 dinalibus vel maculis castanets decor ata ; anfractibus dh, quorum 

 apicales 2-1- subvitrei, castanei, sub lente delicate cancellati, tres 

 quoque his proximi obscure longitudinaliter varicoso-costati, 

 cceteris planatis, undique pulcherrime et tenuissime Jiloso-can- 

 cellatis, ad juncturas gemmidiferis, ultimo anfractu catieros 

 magnitudine excequante ; apertura alba, oblonga, labro tenui, sinu 

 (in speciminibus nostris) haud cernendo ; columella tenui, canali 

 brevisshno. 

 Long. 13, la,t. 4'50 mm. 



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

 Most beautifullj'' encircled with microscopic cancellse, 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 cancellate 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 quite full-grown, for the 

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

 thin, and canal extremely short.''^ 



^ ^i\ov, wood, from the grained-like chestnut martings. 



^ Of the twenty-seven species of Pleiirofomida described by Mr. Edgar Smith 

 mainly in 1877-18.88, and for which, in the earlier part of this paper, we have 

 given most of the references, the following only do not occur in our Catalogue, 

 all having been collected by Col. Pelly with the locality " Persian Gulf," and 



Proc. Zool. Soc— 1901, Vol. II. No. XXIX. 29 



