S TROMBUS cylindricus. 

 False Scarltt-mouthed Strombus- 



Vpper Old under Jigures. 

 Generic Character. — See PI. 10. 



Specific Character. 

 S. (estil coniformi, spird hrexnssimu ad basin depressa, anfractibus convexis in- 



aqualibus, labio exteriore supra lobuto, iutus striato ; inter lore sub-obsoleto, 



alio. 

 Shell conifi)rm ; spire short, depressed at the base, the whorls convex and 



unequal; outer lip lobed above, and internally striated; inner lip 



nearly obsolete, white. 

 Liater 830. 5. (bad.). Gualt. 31. 1. Knorr, vi. tab. 15. 3. 

 Strombus luhuaiius Linn. Martini, x. tab. 157. 1499. 1500. 

 Yoiuig. Lip above entire, inside smooth, v.horls tuberculated. Lister, 849. 



4. a.? Knorr, vi. tub. 17. 2. 



We introduce this common shell for the purpose of pointing 

 out those characters which induce us to consider it more as a 

 distinct species than as a variety of S. Lull nanus of authors ; and 

 this consists not so much in the colour of the inner lip, as in 

 the almost total absence of that important part, which this shell 

 invariably exhibits through all its growths: it is therefore, I 

 think, contradictory to the meaning of the word to term that va- 

 riable which is found to be constant, particularly where the 

 point of distinction rests on a marked difference of formation no 

 less than of colour, though both shells are common to the Orien- 

 tal seas. INIinor differences exist, in the mouth of this always 

 being pink, the inner lip white, and the outer lip but slightly 

 lobed (or cutout) above : in S.Luhuanus the mouth is deep scar- 

 let, inner lip black and highly polished, and the outer lip deeply 

 notched above; the two former characters, indeed, begin to 

 show themselves at a very early growth of the shell. 



STROMBUS Persicus. 



Persian Strombus — middle Jigures. 



Specific Character. 



S. tcstn sub-conifonni, brevi; spira conicd, aquali ; labio exteriore prominenie, 



supra sinuato, infiis glahro ; intcriore polito, albo. 

 Shell somewhat coniform, short; spire conic, equal. Outer lip promi- 

 nent, sinuated above, smooth within; inner lip polished, white. 



Allied, but sufficiently distinct from the last ; the mouth i^ 

 always smooth and white. It is a local species : a few received 

 from the Persian Gulf are all 1 have yet seen, some where young, 

 but no other variation was observable. 

 PI. 53. 



