133 Dr. J. C. Melvill on Marine Mullusca 



In the following pages I am much indebted to Mr. J. R. 

 le Brockton Tomlin for valuable opinions and assistance ; 

 likewise to Messrs. G. B. Sowerby, Hugh Fulton, and E,. 

 Standen. To Mr. Bernard Lucas also I am considerably under 

 obligation for having sorted much shell-sand for me, more 

 particularly from the very prolific sounding made in the Gulf 

 of Oman at 156 fathoms", so often referred to in these papers ; 

 and, finally, I must congratulate Miss Gertrude Woodward 

 on the two successful Plates accompanying these descriptions. 



Bursa gnorima*, sp. n. (PI. IV. fig. 1.) 



B. testa ovato-fusit'ornii, spira abbreviata, apice obtuso, varicibus 

 rotundatis; anfractibus ad 7, quorum tres apicales, laeves, globu- 

 lares, caeteris suturaliter impressis, supra medium angulosis, 

 undique arete et delioate spiraliter granulosis, liuea trausversali 

 subgranata alteraaute, granulis nitidis, supra medium, ad angu- 

 lura, multum fortioribus ; superficie pallide stramiuea ; apertura 

 ovata, alba ; peristomate incrassato, albo, nitido, simul ac colu- 

 mella, intus multilirata ; canali paullum recurvo, brevi. 



Long. 43, lat. 27 mm. 



Hah. Jask, Gulf of Oman. 



It is with some diffidence that I have ventured to introduce 

 another species into a well worked-out and circumscribed 

 genus j but this shell, of which I have seen a few specimens 

 in mi way differing from each other, possesses distinctive 

 attributes, the nearest ally seeming to be the West-American 

 B. crassaj Desh., and I consider it closely comparable with 

 no Eastern species. It is pale straw-coloured, neatly formed 

 and compact, varices somewhat rounded; upper whorls 

 attenuate, body-whorl uniformly finely granose, spirally, with 

 interstitial Hue, partly granulose likewise; above the centre 

 of the whorl a single spiral line of much larger tubercles 

 surrounds it; and just below the sutures short longitudinal 

 plaits extend some way towards this line; the labium is 

 shining white, columella lirate, also white ; mouth ovate, 

 canal short, very slightly curved. At first considered a 

 small variety of B. subgrauosa (Sowb.), I am obliged to 

 Mr. Hugh Fulton for having directed my attention to this 

 species and giving me his opinion thereupon. 



* yvbipi/tos, distinguished. 



