214 GIBBULA. 



T. spurcus OLD., Proc. Boat. Soc. N. H, iii, p. 106 (1849) ; U. S. 

 Expl. Exped. Shells, p. 188, f. 219 ; Otia, p. 58. 



G. GORGONARUM Fischer. 



Shell iiii perforate, conical, slightly elevated, rather thick, pale 

 buff or ashen above, ornamented with subflexuous, irregular radiat- 

 ing brown lines, white beneath ; whorls 7 to 8, flattened, separated 

 by canaliculate sutures, ornamented with a few narrow lirse, evanes- 

 cent in the middle of the whorl ; infra-sutural liration largpr, 

 crenulated ; last whorl acutely carinated ; base densely, concen- 

 trically lirate ; aperture rhomboidal, lip acute ; basal callous wide, 

 subcircular, covering the umbilicus. 



Alt. 10, diam. maj. 14, diam. min. 12 mill. (Fischer.) 



Cape Verde Is., in 410-596 meters. 



G. gorgonarum FISCHER, Journ. de Conchy 1. 1883, p. 393. 



G. GLYPTUS Watson. PL 36, f. 19, 20. 



Shell like T. magus L., but carinated, higher, less scalar, and 

 much more delicately and richly sculptured. Sculpture, spirals 

 a flat shoulder below the suture is followed by an angulation, on 

 and below which is a double row of smallish, round but pointed 

 tubercles, which are remote from cue another but run in pairs on 

 the two rows ; the tubercles in each row are connected by a slight 

 rounded thread ; on the second, third and fourth whorls these rows 

 coalesce into one ; on the last whorl they are about 5-100 inch 

 apart. At the periphery is a strong angulation bearing a sharp 

 carina. About 5-100 inch above this is a spiral thread, which, as 

 well as the carina, is ornamented with delicate, sharp, laterally- 

 compressed beads separated from one another by about twice their 

 own size. Those on the upper spiral are rather the larger; the 

 middle of the whorl for about 0.1 inch is bare. On the base there 

 are five closely-beaded threads, of which the inmost and strongest 

 defines the umbilicus. Between the outermost and the carina is a 

 broad slightly sunken furrow. The carina meets the outer lip and 

 appears above the suture. Longitudinals the upper whorls 

 are ribbed, but the ribbing gradually breaks into the double row of 

 paired tubercles, and the link uniting the pairs in the two rows be- 

 comes very feeble. There are besides many distant, irregular, loose, 

 skin-like puckerings which follow the lines of growth ; they disap- 

 pear on the spiral threads. The whole surface is further roughened 

 by microscopic flexuous wrinklings. Color yellowish white on the 



