18 BULLiETI'N 181, UNTTE© STATES NlATTOCSflAlL MTJSIETJM 



It is easily distinguished from the other subspecies by its very 

 large size and much smoother surface, in which respect it approaches 

 F. (F.) seminudum poeyi. 



The type, U.S.N.M No. 535914, which comes from Nacimiento 

 del Kio Caballero, has 6.4 whorls remaining and measures: Height, 

 33.0 mm. ; greater diameter, 15.4 mm. 



FARCIMEN (FAKCIMEN) SEMINUDUM COLLARE (Poey MSS.). new subspecies 



Plate 4, Figuees 7-9 



This subspecies is rather widely distributed. It ranges from 

 Corrallilo eastward along the hills of the north coast to the Sierra 

 de Meneses, Santa Clara Province. We have it also from a few 

 scattered places to the south of this range. Through this range we 

 find considerable variation, not so much in size and general shape 

 as in the strength of the peristome and the amount of its reflection 

 over the umbilicus, which is also of variable width, sometimes being 

 quite open. There is likewise considerable variation in the strength 

 of the obsolete angle at the outer limitation of the umbilicus. Any 

 of these characters, if constant, might suggest subspecific distinc- 

 tion, but in the present instance this is precluded because in the 

 large series of specimens before us we find that the variations re- 

 ferred to may be present in any of the population groups examined. 

 Almost 60 lots, most of them representing a considerable series, are 

 before us. The subspecies is much larger than F. (F.) semiTVudum 

 'poeyi, with which it shares the fine axial ribbing. 



As a rule, in perfect specimens the early whorls are covered by 

 a thin golden-yellow periostracum ; the later whorls are dark, and 

 by far the largest percentage of specimens are bicolor, though uni- 

 color individuals are not rare. 



The specimen described and figured, U.S.N.M. No. 535909, comes 

 from La Cantarilla, San Juan de los Yeras, Santa Clara Province. 

 It has 5.5 whorls remaining and measures: Height, 28.6 mm.; greater 

 diameter, 14.7 mm. 



FARCIMEN (FARCIMEN) SEMINUDUM POEYI, new subspecies 



Plate 4, Figures 25-27 



We have this subspecies from Loma de Santa Fe, Caniajuani; 

 San Juan de los Remedies, near Santa Clara ; Orillas del Rio Cala- 

 bazas, Placetas; Los Damas near Guayos; Central Mapos, west of 

 Sabana, Sancti Spiritus. 



This subspecies and F. {F.) s. collare are distinguished from all 

 the others by having very fine, closely spaced axial riblets, which 



