172 CERITHIOPSIS. 



C. MUNiTA, Carp. PI. 35, fig. 42. 



Like C. purpurea, but narrower, with almost straight margins, 

 spiral costje stronger, nodules less expressed, base equally lirulate. 



Length, 8 mill. 



Vcmcouver^s Island. 



C. CONVEXA, Sowb. PI. 36, fig. 54. 



Whorls 10, convex, with deep suture, elegantly cancellated, the 

 intersections subnodose, the interstices quadrate, revolving ribs fiaur 

 on each whorl, peripheral carina not tuberculated, base concave, 

 smoothish. Length, 4*5 mill. 



Mazatlan. 



C. GRACiLLiMA, Sowb. PL 36, fig. 45. 



Dark brown, longitudinally lightly plicate ; spirally tuberculate ; 

 whorls oblique, rather ventricose, suture slightly excavated. 



Length, 9 mill. 



Hah. u7iknoum. 



I know not whether it is by accident or design that Sowerby's 

 figure represents a reversed shell. 



C. Destrugesi, Folin. PL 36, fig. 46. 



Yellowish, brown banded above and below the suture ; Avhorls 

 14, with four spiral series of beads on each, caused by crossing of 

 longitudinal and spiral riblets, the two middle series smaller, base 

 defined by a ridge, and bearing several lirse. Length, 6 mill. 



Bay of Panama. 



C. c^LATUM, Couthouy. PL 36, fig. 47. 



Light chestnut color, with thirteen scarcely convex whorls ; lon- 

 gitudinally plicate and encircled by three rows of nodules, suture 

 impressed, marked by a thread, which also appears on the periphery 

 of the last whorl, base smooth. Length, 19 mill. 



Terra del Fuego. 



C. PULvis, Issel. PL 36, fig. 48. 



Cylindrically pupiform, attenuated towards the apex, Avhich is 

 mucronate, fulvous chestnut ; whorls 7-8, almost flat, slowly enlarg- 

 ing, at first smooth, afterwards granulate in three series, the upper 

 row darker colored, base smooth, defined by a row of minute 



granules. Length, 2'25 mill. 



Gulf of Suez. 



C. Angasi, Semper. PL 36, fig. 49. 



Rather thin, pale yellowish brown ; whorls 12, flattened, encircled 

 by three somewhat distant rounded riblets, clathrate by close longi- 



