from (lie Persian Gulfy dr. 5 



Of tlie same dimensions as tlie last species just desciibed, 

 but there are no traces of varices ; the characters, likewise, of 

 the lamelJse are different, these being clearly cut, smooth, and 

 thicker than in the fellow sj)ecies. The spiral strise are also 

 much more fine and delicate. 



There seems now no hope that the names Scalaria or 

 Scala, which have graced this genus with such aptitude 

 during so many years, can be preserved, unless, indeed, some 

 of the more inexorable decrees of the law of priority be 

 removed. Since Bolten's names are to hi recognized, it will 

 be well to ask why he called the " Wentletraps ^' by the 

 liarsh-sounding Epitonium. The name migiit be worse 

 liowever : it is pure Greek, iinroviov signifying the ''key by 

 Avhieh the strings of an instrument are tightened to tune it"; 

 presumably, therefore, the chord-like close longitudinal 

 lamella^, tightly packed over tlie whorls, suggested it. 



Crosseia alUciens *, sp. n, (PI. I. fig. 7.) 



C testa minima, anguste umbilicata, rotundo-conica, pellucida, 

 albo-vitrea, nitida, teuuissima ; anfractibus 4, apicali parvo, 

 coeteris apud suturas impressis, ventricosulis, laevissirais, ultimo 

 globose, circa umbilicum concentrice fortiter exsculpto et margi- 

 nato, umbilico ipso parvo ; apertura ovato-rotunda, peristomate 

 tenui, collumella excavatula. 



Alt. 1"75, diam. 1'30 mm. 



Hah. Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 15G fathoms, shell-sand. 



Very minute and papyraceous; perhaps, indeed, not quite 

 adult, but the distinguishing features of tlie species are all 

 present — the umbilicar ridge, for instance, is strongly built 

 and conspicuous. The umbilicus itself is small and narrow ; 

 whorls four, ventricose. {Substance of shell glassy, thin, 

 quite smooth throughout, and polished. The only other 

 species yet known from the same seas is C. eryma, ]\Ielv. f 

 This, though equally small, is a stouter shell, solid, and 

 spirally closely striate throughout. But fesv possess no sculp- 

 ture; such, however, is the case with C. nadcoides, Hedley if, 

 and one or two other Australian species, including also 

 C. glabella, Murdoch §, from New Zealand, and carinata, 

 Hediey ||, from Port Kemble (' Thetis' Expedition), a very 

 minute species, alt. T7, diam. 1-46 mm., with a blunt peri- 

 pherial keel. 



* Alliciens, alluring. 



t Proc. Mai. Soc. Lend. vii. (1006) p. 70, pi. vii. fip-. 7. 

 X Rec. Australian Mus. vi. (1907) p. 290, pi. liv. fig?. 6, 7. 

 § Trans. JS'.Z. Inst, xxxvii. (1905) p. 22-5, pi. viii. tigg. Ifi. 17. 

 i| Mem. Austral. Mus. iv. p. 34-5, tip. 71 (190.3). 



