MF.LVILI, AND STANDEN : GENUS SCALA IN THE PERSIAN GtJLF. 341 



convenience, be used. This was also alluded to by one of us a few 

 years ago, when we proposed to still consider Scalaria the best name 

 to employ^ while recognizing at the same time that it was against the 

 strictest letter of the law of priority. We cannot augur what zoologists 

 of the future will do; since using an unbinomial author's insufficiently 

 diagnosed term, even if it be not exactly a nomen nudum, will not be 

 considered always binding in the case of Scala. And, surely, it would be 

 a terribly retrograde step to adopt Cydostoina, albeit by many that 

 name is now dismissed from the genus it has been so long connected 

 with, in favour of Poinatias Studer. Perhaps, on the assumption 

 "once a synonym, always a synonym," the difficulty may be bridged 

 over, and Scalaria be again adopted. We, personally, hope this may 

 be rendered possible. 



Family SCALID.E. 

 Genus SCALA Klein, SCALARIA Lam. 



Scala alata Sowb. 



P.G. Galig Island, at low tide. 



M.C. Charbar, 7 fathoms. 



Scala angustata Dunker. 



M.C. Charbar, 3-7 fathoms. 



Scala bulbulus Sowb. 



M.C. Charbar, 7 fathoms. 



I. Karachi, at 3 to 7 fathoms, amongst loose rocks and sandy mud. 



This in our catalogue is called S. Clementina Grat. 



Scala amathusia sp.n. (PI. VII., fig. i). 



6". testa fusifonni, niediocri, ini perforata, candida, uitida, delicata. an- 

 fractibus 8-9, quorum apicales duo vel tres, pellucidi, perlceves, cceteris 

 ad suturas impressis, ventricosulis, undique rectilamellatis, lamellis 

 acutis, tenuibus, interstitiis Icevibus, numero ultimuin ad aiifractuni 

 18-20, apertura rotunda, labro paullum crassiusculo. 

 Long., 6-50. Lot., 2-50 mm. 

 Bab., Mekran Coast, Charbar, 7 fathoms. 



One of the most delicately beautiful of the whole series, and there- 

 fore worthy to bear an appellation formerly assigned to Aphrodite. 

 It is not uncommon, though evidently very local, nearly twenty speci- 

 mens having been received from the above dredging. These differ 

 very little between themselves, and are all very much of the same 

 measurement. 

 Scala calidea sp.n. (PI. VII., fig. 2). 



S. testa attenuato-fusiformi, imperforata, delicata, albida, anfractibus 

 circe undecim, quortim 2^ apicales, pe?-l(Bves, albo-lactei, pellucentes, 

 cceteris ventricosis, apud suturas profunde impressis, undique arete 



1 Melvill, " Principles of the Laws of Nomenulature,' etc., Journ. Conch., vol. viii., p. 475. 



