600 RET. E. BOOG WATSON Olf THE 



inserted; they terminate abruptly in a patulous and sliglitly 

 prominent mouth-edge, which is regularly curved, has no sinus, 

 but has a concave edge. WTiorls 8 ; but the shell is not full- 

 grown ; the upper ones are angulately carinated in the middle, 

 with a sloping shoulder between the suture and the keel ; they 

 are all slightly rounded, with a very faint contraction into the 

 suture ; the last is tumid, angularly rounded, with a very con- 

 tracted convex base produced into a very long snout. Suture 

 angulated and slightly constricted. Mouth oval, rounded above, 

 pointed below, where it runs into the long, nearly closed, linear, 

 straight canal. Outer lip semicircular ; its edge, which projects 

 markedly in front of the labral varix, is somewhat cut up by 

 slashes continuous with the furrows of the spines ; a basal tooth is 

 somewhat prominent ; internally the lip is feebly toothed. Inner 

 lip spreads thinly and narrowly on the base, and advances straight 

 down the pillar as a reflexed lamina, which is abruptly turned 

 over to the right to cover the canal, leaving behind it a chink 

 above and a long straight furrow below. H. 1'8. B. 0*6. 

 Penultimate whorl, height 0'13. Mouth, height 1'5 (excluding 

 the canal 0-38), breadth 0-27. 



This species is very like M. Macgillivrayi, Dohrn, but is cer- 

 tainly distinct. Like that species it has two intervarical ribs; 

 and the texture of the shell and the short spines are similar ; but 

 the spiral threads are different, the spire is bigger, broader, and 

 shorter, and that species has none of the hollow squamous spines 

 which ornament the earlier whorls; the embryonic whorls of 

 the apex are a good deal alike ; but the cone in M. Macgillivrayi 

 is smaller and less regular, its whorls being more rounded and 

 parted by a deeper suture. In these resjDects the apex resembles 

 M. aduncospinosus, Beck, from which it manifestly differs widely 

 ui other ways. In the hollow squamous spines of the earlier 

 whorls it resembles M. ternispina ; but the arrangement of these 

 is different, and the embryonic apex of that species is utterly 

 diverse. M. Cahritii, Bernard! (Journ. de Conch, vol. vii. 1858, 

 p. 301, pi. X. f. 3), has a considerable general resemblance, but is 

 not angularly carinate above, has not a scalar spire, has a shorter 

 and coarser apex, has 4 {teste Bernardi, biit his figure and Sowerby, 

 in his ' Thesaurus,' pt. 83, p. 2, pi. cccxciii. f. 137, both in text 

 and figure, say 3) intervarical ribs, and the spirals are much 

 coarser and less sharp. 



