1901.] MOLLUSKS FROM THE PERSIAN GULF. 415 



Cyllexe geati Eve. 



M.C. Charbar Bay. Sand, 4-8 fathoms, with C. fuscata. 

 These two species, indeed, may be only varietal forms, the latter 

 (tjrayi) being as a rule longitudinally plicate, while the former is 

 nearly smooth, the tessellated paintiug being in both identical. 



Fam. Buccixidje. 



PlSANlA IGXEA Gmel. 



M.C. Not abundant, but locally found at Charbar, Gwadur, 

 and Ormara. 



Tbitonidea rawsoxi Melv. 



Si-strum raivsoiii Melv. Mem. Manch. Soc. vol. xli. part iii. no. 7 

 (1897), p. 5, pi. 6. fig. 3. 



P.G. Shaikh Shuaib I. On telegraph-cable, lat. 27° N., long. 

 52° E. From 30 to 50 fathoms, amongst shell-growth. 



This is one of those species on the border-line of at least three 

 other genera: e. g., Engvna, Sistrum, and Cantharvs yTritonidea). 

 "We follow the arrangement by Mr. Edgar Smith in our National 

 Collection. It was named after the late Sir Eawson "W. Eawson, 

 K.C.M.G., a friend of both Mr. Townsend and the authors, who 

 took a very great interest in the results of the dredging of the 

 Persian Gulf and Arabian Sea. 



Tritoxidea rubigixosa Eeeve. 

 I. Bombay (Abercrombie). 



Tritoxidea spiralis Gray. 



M.C. Abundant everywhere between tide-marks, usually 

 amongst loose muddy rocks. 



I. Bombav (Abercrombie). Karachi, common. Near Goa 

 {U.-Col. H. D. Olivier). 



Tritoxidea tissoti Petit. 



I. Karachi. Bombay {Abercrombie as Purpura). 



Very common on rocks at low tide : the generic position of this 

 species being much contested. By some authors it is included in 

 Purpura, while Puama and Tritonidea (Cantharus) present almost 

 equal claims to it. 



Tritoxiuea iixdosa L. 



M.C. Abundant amongst loose muddy rocks from half-tide to 

 low-water mark, along the whole range of the W. coasts of India 

 proper and Baluchistan, to Persia. We, however, have no exact 

 records from tin- Persian Gulf. 



I. Karachi. Not mentioned in Melvill and Abcrerombie's 

 Bombay < Catalogue. 



.Ml.lt l.\ TEIFA8C1ATA Sou 1). 



P.G, A rery elegant ihett, Daphnetta-th&ved, finely decussate, 

 stramineous, thrice-banded on the body-whorl with reddish brown 

 The type was described from China. 



