346 JOURNAL OF CONCHOLOGY, VOL. lO, NO. 12, OCTOBER, I903. 



Scala rissoinaeformis sp.n. (PI. VII., fig. lo). 



6". testa ovato-fusiformi, suh-perforata, compacta, alba, anfractibus 8, 

 quorum quatuor apicales, diaphani, leaves, quatuor ultimis ventri- 

 cosulis, apud suturas impressis, longitudinaliter undique arete lamel- 

 latis, la/nellis coniinuis, fiitidis, Icevibus, hie illic, majoribus, incrassatis, 

 numero ultimutn ad anfractu??i circa octo et viginti, interstitiis, sub lente, 

 arete spiraliter liratis, apertura rotunda, intus alba, labro rissoincB- 

 for?iii, incrassato, nitido, IcBvi. 

 Long., 4"2. Lat., 2 mm. 



Hab., Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 156 fathoms. 

 A remarkable little species, of the same character as S. natia Jeffr., 

 from European waters. In the incrassation of one or two of the 

 lamellae here and there, a resemblance to the much larger S. raricos- 

 tata Lam., may be traced ; that species, however, is of the sub-genus 

 AmcBa, while S. rissoinceformis belongs, we consider, to the typical 

 section of the genus. 



Almost twenty-five examples. 



Scala sykesii sp.n. (PI. VII., fig. n). 



S. testa delieata, ovato-fusiformi, alba, anfractibus septe?n vel octo, 

 quorutn qitatuor apicales, attenuati, perlcBves, vitrei, cceteris undique 

 arctissime lamellatis, subvefitricosis, apud suturas compressis, lamellis 

 temiibus, aeutis, obliquis, undulatis, mwiero ultimum apud anfractum 

 circa 42, apertura circulari, labro haud incrassato, marginem ad 

 cohwiellarem reflexo. 

 Long., 4. Lat., 2 7nm. 



Hab., Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 156 fathoms. 

 This species seems distinct from S. rissoinceformis in many particulars, 

 though at first one is apt to confuse the two. The form of the shell 

 and apical whorls are, indeed, almost identical, but the lamellse are of 

 a different character, undulate, much closer and finer, and more ob- 

 lique ; there is no occasional unduly thickened varix, and the number 

 of lamellre; on the last whorl exceeds forty. The outer-lip, also, is not 

 so prominent, being barely thickened, while it is considerably reflexed 

 over the columellar margin. The interstices between the lamellae 

 seem smooth. To Mr. Ernest R. Sykes we dedicate this species, 

 which he was the first to extract from the shell-sand dredged at the 

 above locality, where it occurred in considerable plenty, being, after 

 X continetis M. & S. by far the commonest form. 

 Scala thelcteria sp.n. (PI. VII., fig. 13). 



.S". testa minuta, ovato-fusiformi, imperforata, albida, crassiuscula, an- 

 fractibus octo, quorum quatuor apicales, Iceves, albo castanei, subhyalini, 

 cceteris ventricosis, apud suturas impressis, undique longitudinaliter 

 lafnellatis, lamellis aeutis, paullulum reflexis, fimbriolatis, numero 

 ultimum apud anfractum quindeci?n, spiraliter conspicue rudiliratis, 



