208 DELPHINULA. 



Delphinus decrepltus and I)elphhw8 afratiis Chemnitz are identi- 

 cal with this species. 



D. viartinii A. Adams, (pi. 66, fig. 19) from Padang differs only 

 in the color. The spines are red or purplish on a pink ground. 



Var. MELAXACANTHA Reevc, 1842. PL Q^, figs. 6, 7. 



Whorls rounder, less carinated below than in the type; surmount- 

 ed by a corona of slender long radiating or ascending spines ; um- 

 bilicus wider. 



D. imperiaUs Reeve and I), distoiia Kiener (not Lam. nor Linn.) 

 are synonymous. 



D. SPH-V.RULA Kiener. PI. 67, fig. 5 ; pi. 68, fig. 20. 



I know this form only by the description and figures given by 

 Kiener. The latter are copied on my plates. In the simple, appar- 

 ently very regular spines, the form is different from any specimens 



I have seen. 



Indian Ocean. 



D. DiSTORTA Linn, 1758. PI. 65, fig. 8 ; PI, 68, figs. 12, 13. 



In general form similar to D. laciniata. Upper surface of lohovh 

 radiately conspicuously plicate, the folds terminating in solid knobs 

 or short spines at the carina ; lirse rather coarser than in laciniata ,- 

 base of body-whorl rounded or only obtusely carinated ; the sculpt- 

 ure and color of the umbilical area not notably different from that 

 of the whorl outside ; color white or pink, the line, spines and scales 

 deep crimson; size smaller than laciniata. Alt. 30, diam. 40 mill, 

 or less. 



, Indian ; Nicohar Is., etc. 



This is the Tarho distortm of Linn., Delphinula distorta Lam., 

 and D. rugosa of Kiener's plates. 



Afc far as my material allows me to judge, this form does not in- 

 tergrade with D. laciniata. 

 D. TYRiA Reeve, 1842. PI. 66, figs. 12, 13. 



In general form like D. laciniata. Whorls angulate at the shoul- 

 der, rounded or obtusely angular around the umbilicus, covered all 

 over with densely and acutely squamose lirse ; upper surface of 

 whorls plane or gently radiately undulating; color white, the um- 

 bilical region and a subsutural spiral band, deep purple or purplish 



crimson. Alt. 45, diam. 50 mill. 



A^istralia. 



The fine uniformly scaled sculpture will distinguish this beautiful 



species. 



