136 MACROCERAMUS, CUBA. 



with a series of spots above the periphery; apical 

 whorls often amputated; the early post-embryonic 

 whorls sharply striate, usually dark colored. 



Group of M. pupoides, sp. no. 23 to 32. 



II. Base of shell carinate; shell thin, smoothish, with per- 

 sistent apex, the following whorls not distinctly striate; 

 peristome expanded. 



Group of M. canimarensis, sp. no. 33 to 35. 



Group of M. pazi. 



Forms related to the group of M. pupoides, but with a dark 

 band below the periphery and usually another at or around 

 the umbilical region. Last whorl rounded, not carinate. Lip 

 usually more or less expanded. 



Eastern Cuba, This group is intermediate between the 

 Haitian groups of M. lineatus and Tdatteanus. The first 

 two species somewhat resemble the group of M. canimarensis 

 by the smooth spire and expanded lip, while the last three 

 approach the group of pupoides. The protoconch is like that 

 of the pupoides group, and is often deciduous. 

 I. Upper post-embryonic whorls not more striate than the 

 last whorl; shell smooth and glossy. 



a. Length of aperture more than one-third that of the 

 shell ; outer lip well expanded. M. pazi, no. 18. 



b. Length of aperture less than one- third that of the 

 shell; an elaborate color-pattern of bands and 

 streaks. M. pictus, no. 19. 



II. Upper post-embryonic whorls more distinctly and regu- 

 larly striate than the last whorl; surface somewhat dull. 

 a. Shell conic; length of apert. slightly more than one- 

 third that of shell ; length 11-14 mm. 



M. parallelus, no. 20. 



6. Shell turrite; apert. less than one-third length of 

 shell; marked with 3 series of squarish dots, some- 

 times coalescent in bands and streaks; length 15-17 

 mm. M. clerclii, no. 21. 



c. Shell turrite; apert. contained 3^> to 4 times in 

 length of shell; whorls streaked; length 14-15 mm. 



M. gundlachi, no. 22. 



