350 JOURNAL OF CONCHOLOGY, VOL. lO, NO. 12, OCTOBER, I905. 



mamillate. The four lower whorls ventricose, roughly longitudinally 

 lamellate, occasionally variciferous. The species seems, in form, a 

 Cirsotreina, of the same alliance as, but much smaller than, 6'. crassila- 

 brum Sowb. Frequent, but easily overlooked. 



Scala (Cirsotrema) optima sp.n. (PI. VII., fig. i6). 



S. testa attenuato-fusiformi, albidcj, anfradibus {in speciinine unico im- 

 perfedd) decern, quorum apicales .? . . . cmteris ad suturas ijiipressis, 

 ardissime et pulcJurrime undiqne decussatis, lamellis longitudiiialibus 

 obliquis, tenuibus, acutis, creberrhnis , hie illic variciferis, spiraliter 

 liratis, interstitiis quadratis, apertura parva, rotunda, intus alba, 

 labro tenui, tnarginem apud umbilicarein reflexo. 

 Long., 13. Lat., 3 mm. 

 Hab., Maskat, 8-10 fathoms. 



An imperfect type is all we have, but the characters seem most dis- 

 tinct. S. /('zV«m Tapp.-Can. {S. decussata Kien.) is the nearest ally, but 

 in that species the lamellae and the spiral lircC are infinitely coarser in 

 texture. We should expect this species to grow considerably larger, 

 but not to attain the length of three inches, as does S. kieneri. 



Scala (Acrilla) acuminata Sowb. 



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



I. Karachi, 15 fathoms, very rarely. 



Bombay (Abercrombie) not infrequent, mostly broken in sliell-sand. 



Scala (Acrilla) minor Sowb. 



Scala (Acrilla) gracilis A. Ad. 



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

 M.C. Charbar, 5 fathoms, mud. In colour of a darker brown than 

 is typical, the lamellae being more distant and fewer in number. 

 I. Karachi, 3 fathoms, amongst mud and stones. 



Scala (Constantia) intertexta M. & S. 



(^Ann. 6^ Mag, N. Hist. (7) vol. 2, p. 306, plate xxiv, f. 6, 1903). 



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



This very puzzling species seems best fitted to the sub-genus 

 Constantia, but we are by no means certain as to its exact location, 

 since in form of mouth and general build it, apparently, comes nearest 

 to Onoba egregia A. Ad., which, however, may be an Adis. The whole 

 alliance requires much further study. Superficial likeness also exists 

 to Alumiola spirata Ad. Two examples, so far, only have been found 

 in the above dredging. 



Scala (Constantia) standeni Melv. 



I. Karachi. Also in lat. 18 58' N., long. 71° 45' E., 40 fathoms. 



An ovate brownish finely decussate species, which was found locally 

 abundant at the above localities. 



