MELVII.L AND STANDEN : GENUS SCAI.A IN THE PERSIAN GULF. 349 



quatuor apud suturas impressis, gradaiults, undique longitudinaliter 

 costatis, costis arctis, crassis, rudibus, hie illic varicosts, ultimi 

 anfractus circa 1 6, versus basini spiraliter costulata, crassa, fimbriata, 

 deinde pulcherrime radiata, interstitiis profundis clathrato-fenestratis, 

 apertura rotunda, peristomate multum incrassafo, continuo, spiraliter 

 striata, columellarem extus marginem minute multi-clathrato 

 ^-^c^S-1 5- Lat., 3 mm. {sp. maj.). 



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

 in shell sand. 



This very interesting little species, with its chalky-white consistency 

 and thickened ribs, peristome, and large occasional varices, has affinity 

 with, being indeed, almost a replica in miniatuie of S. {Opaiia) diadema 

 Sowb., from the Galapagos Islands. However, it is impossible to dis- 

 sociate it from the section Cirsotretiut, the characters uf the peristome 

 and the basal rib being such as to preclude its being placed elsewhere. 

 Two or three examples have occurred, alike, save as to size. 

 {corolla, dim. of corona). 



Scala (Cirsotrema) hellenicum Forbes {=crassilabrum Sowb.). 

 P.G. Maskat, 10 fathoms. 

 M.C. Charbar. 



Scala (Cirsotrema) fimbriolata Melv. 



P.G. Gulf of Oman. Two off Maskat, 10 fathoms, thick mud. 

 One of them, now in the British Museum, is 52 mm. longitudinall}^ 

 The whorls are not nearly so ventricose as in /^/<?//m Tapp.-Can. {S.decns- 

 sata Kien.), and the lamellje very wonderfully fringed. The finest 

 Scala of this region. A few smaller examples occurred, in 1902, also 

 off Maskat, at 1 5 fathoms. 



I. Karachi, small, rarely. 



Scala (Cirostrema) hidryma Melv. 



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



M.C. Charbar. 3 to 7 fathoms. 



I. Karachi, from whence came the type. 



Scala (Cirsotrema) kieneri Tapp.-Can. {=decussata Kien). 



I. Angrias Bank (Captain AV. A. Tindall). 



Scala (Cirsotrema) mammosa sp.n. (PI. VII., fig. 15). 



S. testa minutissiina, subimperforata, alba, solidula, anfractibus octo, 

 quorum quatuor attenuati, cequales, viamillati, albo-brunnei, Icsves, 

 cceteris ad suturas multum impressis, ventricosis, longitudinalitet 

 rudi-lamellatis, lamellis hie illic variciferis, apertura rotunda, 

 labro cofttinuo, multum incrassato, albo, sub lente striatulo. 

 Long., 3. Lat., I mm. 



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

 Very minute, but most characteristic, in sculpture and especially 



in the apical whorls, these being attenuate, equal, and narrowly 



