14 Melvill, Molluscan Fauna of the Arabian Sea, etc. 



addition to that of size, occur. For instance, the canal is 

 shorter, aperture wider, with the surface of the whorls 

 more coarsely, though equally evenly, clathrate. 

 (/ca/xaS, a trellis. Lat. clathrus.) 



Lachesis BICOLOR, sp. nov. 



(PI. i,f. i;.) 



L. testa fusiformi, solidiuscula, versus apicem attenuata, 

 carneo-brunnea^ ad utrainque extrentitatein albescente^ an- 

 fractibus fortasse octo — apicalibus ? — cateris longitudinaliter 

 flexuoso-costulatis^ costis spiraliter arete striatis, apertura 

 late ovata, labro effuso, simplici, liaud sinuigero. 



Long. 7, lat 2 mm. 



Hab. Persian Gulf 



Several species of the small genus, Lachesis^ inhabit the 

 Mediterranean, one of them being British. One Japanese 

 species is recorded, and one from St. Paul I., South Indian 

 Ocean {L. Turqueti Velain.). It is interesting, therefore, 

 to find another in the Persian Gulf, possessing the family 

 " facies," but the outer lip more effuse than usual, the 

 colour pinkish-brown, whitening towards both extremities, 

 the shape fusiform, probably eight-whorled, but the apical 

 whorls are wanting in the specimen before us. 



ANCILLA TINDALLI, sp. nov. 

 (PL I, f I.) 

 A, testa oblongo-fusiformi, apud apicem attemiata, 

 nitidissima, pallide stramineo-ockracea, anfractibus septein- 

 octo quorum tribus apicalibus^ pellucido-vitreis, cceteris 

 transversim paullutn infra suturas unisulcatis, interstitid 

 castaneo-affusa, ultimo anfracta vix effuso, in medio cinna- 

 momeo-castaneo ochraceo, delicate sub lente lineolato^ juxta 

 basim fasciola pallide castanea decor ato^ apertiira ovato- 



