708 BEV. E. BOOG WATSON ON THE 



point of it augulated slightly ; nacreous within ; across the body 

 there is no pad, but the shell is eroded, which looks like a thin 

 callus. Outer Up thin, not descending. Pillar-lip slightly 

 patulous, bending flatly over the umbilicus, and then advancing 

 in a straight line to the point of the pillar, where it is slightly 

 angulated just where the beaded umbilical spiral ends. Tlmlilicus 

 funnel-shaped, rather open, but a good deal contracted within, 

 sharply scored with the lines of growth. Operculum yellow, 

 horny, very thin, of 7 to 8 whorls. H. 0-81. B. 065, least 0-59. 

 Penultimate whorl 0-2. Mouth, height 0-37, breadth 0-35. 



This beautiful species, of very singular aspect, recalls in a 

 very general way the form of Turcica ononilifera, A. Ad., but differs 

 from that in its rounded contours, strongly contracted suture, 

 umbilicus, and straight untoothed pillar. There is a Margarita 

 aspecta, A. Ad., which this species resembles in form, but that is 

 less tumid, is carinated, its umbilicus is much smaller, the spirals 

 are many more, and they are not tubereled. 



The presence of this species at two such separate localities as 

 Bermudas and Marion Island, between the Cape and Australia, is 

 interesting. 



13. Trochus (Maugauita) pachtchiles, W. (^■axwx^t^»/!f, 

 thick-lipped.) 



St. 201. Oct. 26, 1874. Lat. 7° 3' N., long. 121° 48' E. 

 Philippines. 102 fms. Stones and gravel. 1 specimen. 



Shell. — Small, conical, with the last whorl tumid, especially 

 toward the mouth, which is extremely oblique, with a thickened 

 lip ; carinate, widely umbilicate. Sculpture. Spirals — in the 

 centre of the body- whorl is a strong carinal thread, which almost 

 runs into the outer lip at its junction with the body, but just 

 lies above it, and so stands out round the base of the Avhole 

 earlier whorls ; this thread is set with strong, sharp, remote tuber- 

 cles, which become feebler and more crowded toward the mouth : 

 halfway between the carina and the suture is another thread, set 

 with feebler tubercles ; these two threads only appear on the 

 second regular whorl, but on the body- whorl, especially towards the 

 mouth, many others make their appearance a little below the 

 carina, and issuing from the junction of the outer lip is a feebler 

 tubereled thread, defining the base. On the base are three strong 

 closely-beaded threads, the inmost of which defines the umbilicus, 

 within which is a finer beaded thread and, deep inside, a ridge. 



