from the Persian Gulf, &c. 151 



kindly gave me his opinion on the subject — that it was 

 unlikely that the Gulf fauna contained a single species found 

 in the Mediterranean ; but since we hear of perversa occurring 

 on the Pacific coast, in West America, we dare not accept 

 this theory as completely valid, and prefer to leave the name 

 unaltered. One interesting form of this mollusc inhabiting 

 the coast near Karachi is larger than the normal type which 

 so commonly extends from Bombay northwards, and measures 

 long. 9, lat. 2 mm. ; whorls 15, nuclear small, slightly 

 caudate; whorls impressed suturally, of the usual pattern, 

 3-seriate, with spiral small gemmulate nodules ; colour pale 

 stramineous, nuclear whorls pure white ; body-whorl four- 

 rowed, two raised ridges around the base. A narrower shell 

 than incolumis, and not so gracefully attenuate as interpres. 

 To this variety of perversa the name persica might be 

 attached. 



T. idonea, M. & St., is a white chalky shell, of deep water. 

 It has not occurred plentifully, and perhaps comes nearest to 

 interpres. 



T. corrugata, Hinds, is, next to the ordinary form of what 

 we still call perversa (L.), the most abundant and striking of 

 the Gulf Triphoros. It is found all along the coast, and with 

 it we now merge what was erroneously called cingulata in 

 our first Catalogue. 



To these T. concatenata, Mel v., a small, very attenuate 

 species, has been added, and the occurrence of T. concors, 

 Hinds, been noted. Therefore, including the two new species 

 incolumis and interpres, eight species of this genus are now 

 recorded, of which, so far as is known, three are endemic in 

 these seas. 



Leptothyra miltochrista *, sp. n. (PI. V. fig. 24.) 



L. testa Bolida, suborbiculari, fulvo-rubescente; anfractibus 5, 

 quorum tres apicales, laeves, albi, cseteris duobus undique arete 

 spiraliterliratis, Kris uniforuribus ; apertura rotunda ; peristouiate 

 crassiusculo nitido, albo, simul ac margins columellari ; umbilico 

 anguste sed profundo, cujus margiue nequaquam crenulato. 



Alt. 3*75, diam. 4 mm. 



Hab. " Persian Gulf," probably off Henjam Island. 



A small, solid, orbicular, reddish-yellow species, with 

 shining white peristome and columella surrounding its 

 circular aperture j margin of the deep but narrow umbilicus 

 not, as is so often the case, crenulate, but quite simple. The 



* fu\rox|Oioros, in allusion to the red-ochre colour. 



