154 Dr. J. C. Melvill on Marine Mollusca 



Euchelus xeniolum *, sp. n. (PI. V. fig. 27.) 



E. testa perparva, ovato-conica, imperforata, Candida ; anfractibus 7, 

 quorum 3 apicales, apice ipso prominulo, duobus huic proximis 

 longitadinaliter oblique liratulis, cseteris apud suturas profunde 

 impressis, superuis spiraliter 4-, ultimo 9-liratis, liris regularibus, 

 superficie longitudinaliter oblique eancellato-decussata ad junc- 

 turas lirarum pulcbre gemruato-uodulosis, gemmis nitidis, infra 

 peripheriam ad basin minoribus, concinnis, regularibus ; aper- 

 tura rotunda, peristomate fere continuo, intus denticulato, 

 margine columellari excavata. 



Alt. 4-50, diam. 3 mm. 



Hub. Gulf of Oman, Gharbar, 5 fathoms. 



A small white Euchelus, normal in general characters, 

 beautifully and regularly spirally lirate and decussate ; at 

 the point of junction the gemmulate nodules are round and 

 shining. Mouth small, roundish ; peristome almost con- 

 tinuous ; columella excavate. 



Cylichia euthlasta f, sp. n. (PL V. fig. 28.) 



C. testa perparva, fragilissima, ovato-cylindrica, alba, lateribus fere 

 rectis, undique spiraliter arete tenuistriata, striis sub lente 

 mimrtissime depunctis ; apertura versus basin paullum dilatata, 

 supra angusta, vertice profunde umbilicata, margine rotundato, 

 columella simplice. 



Alt. 2'75, diam. '75 mm. 



Hob. On rocks at low tide, Karachi. 



Comparable with three species described by the late 

 Mr. Edgar Smith (but unfortunately not figured), all of 

 Avhich occur in the same seas, viz., consanguinea, perpusilla, 

 and pumilissima %. 



The first of these is longitudinally curvedly striate, vertex 

 encircled with acute carina round the umbilicus, lip slightly 

 contracted in the centre. 



Perpusilla is smaller and with quite smooth surface ; while 

 pumilissima t equally minute (alt. 1^, diam. f mm.), possesses 

 longitudinal curved ridges and very dilated aperture basally. 



The specimen selected for the type was accidentally broken 

 after being figured, and a smaller example has to be considered 

 the available co-type. 



* %evio\ov } a little gift. 



t evQXaaTos, fragile. 



X Aim. & Mag. Nat. Hist. (4) ix. pp. 352-3. 



