TROCHUS. 29 



T. MIRABILIS G. B. Sowerby, Jr. PI. 6, ng. 55. 



Shell rather solid, fleshy-white, with longitudinal reddish-brown 

 flames ; whorls 10, flatly convex, deeply excavated at the suture, 

 encircled spirally with strong granular ribs, between which the 

 interstices are deep and plicated ; spire acute ; base rather convex, 

 with rather a broad excavation, and a deep umbilicus above the 

 columella ; aperture nearly square, ridged within ; columella fur- 

 nished with nodulous plaits. Alt. 40, diani. 30 mill. (Sowerby.) 



Moluccas. 



T. (Polydonta) mirabilis Sowb., P. Z. S. 1875, p. 126, t. 24, f. 7. 



The roughly granular ribs and the deeply excavated suture are 

 its chief characters. (Soiverby.) 



T. SAXDWICHENSIS Souleyet. PI. 1, figs. 1-3. 



Rather straightly conical, falsely umbilicate, thick, solid ; outlines 

 of spire nearly straight, apex acute; whorls about 8, the last ob- 

 tusely angulated at the periphery ; sutures scarcely impressed ; 

 color of upper surface grayish or corneous white, broadly longitudi- 

 nally striped with red or purplish, the red sometimes covering the 

 whole surface, sometimes reduced to small maculations or narrow 

 lines ; base with narrow zigzag radiating red stripes. The sculpture 

 of the upper surface consists of spiral series of very regular, deeply, 

 separated rounded granules or beads, five or six rows on each 

 whorl ; on the periphery and base the granules are smaller ; on the 

 base the rows are more separated, and sometimes have minute inter- 

 calated beaded lirulre in the interstices; there are 12 to 15 rows of 

 beads on the entire last whorl. The aperture is small, strongly 

 lirate inside the outer lip ; basal margin thick, dentate ; parietal 

 wall callous, strongly lirate, deep crimson colored ; columella ob- 

 lique, irregularly 3 or 4 dentate; umbilical tract with a heavy 

 white callus inside, obsoletely spirally bi- or tri-plicate. 



Alt. 25, diam. 24 mill. Sandwich Is. 



T. sandwichiensis EYDOUX ET SOULEYET, Zool. du Voy. de la 

 Bonite, pi. 37, f. 23, 24. T. intextus KIENER, Spec. gen. Trochus, 

 t. 37, f. 2. T. metallicus REEVE, Conch. Icon, f. 94. T. tenebricus 

 REEVE, Conch. Icon. f. 81, 1861. 



The nearly rectilinear spire, distinct, regular granulation, and 

 the deep red parietal wall are diagnostic marks of this species. 



