PARTULINA, SECTION PERDICELLA. 19 



THWING, Reprint Orig. Descript. Achat, p. 136, pi. 3, f. 7. 

 Perdicella ornata Nc., BALDWIN, Nautilus, xix, p. 113. 



A rare species, of which twenty specimens from the Newcomb 

 and Gulick collections, taken 50 to 60 years ago, are before us, 

 all "dead" shells, and a smaller series of "live" shells from 

 Baldwin. The straightly pyramidal spire and subangular peri- 

 phery give the shell an aspect of its own. The suture is very 

 distinctly margined by a band defined by an impressed line in 

 some shells, but in most of those seen there is no trace of such 

 margin ation. 



First 1^ or 2 whorls are flesh or whitish flesh-colored; next 

 half whorl has broad flexuous or irregular flesh-brown and 

 white stripes; after which the brown markings become narrow, 

 zigzag, and on the last whorl they are often dislocated, spotted 

 or mottled, though sometimes distinctly striped as in Newcomb's 

 type figure. On the last whorl there is a subperipheral brown 

 belt in all the specimens seen. It is bordered below by a pale or 

 cream-colored belt, more or less distinct. The columella is 

 dilated above in a small triangle, calloused, and convex, ob- 

 liquely trancated far above the base. 



Length 14.8, diam. 6.5, aperture 6 mm.; 6 whorls. 



Length 14.8, diam. 6, aperture 5.8 mm.; 6J whorls. 



3. P. ZEBRA (Newcomb). 



' ' Shell dextral, conically elongate, shining, with microscopic 

 decussating striaB; whorls 5 round, narrowly margined above, 

 suture well marked; aperture ovate; lip thin; columella short, 

 abruptly terminating in a large prominent plait; color of epi- 

 dermis yellowish white, alternating with longitudinal chestnut 

 lines; base of an umber color, with a revolving line of the same 

 color above. Length 11, width 5 twentieths of an inch" [13f 

 X 6Jmm. (Newc.} 



East Maui (Newcomb). 



Achatinello. zebra NEWC., Annals of the N. Y. Lyceum of 

 Natural History, vi, p. 142, Oct., 1855. PFR., Monogr. ix, 537. 



Described from a single specimen, and not figured. It seems 

 to resemble P. ornata in color-pattern, differing from zebrina Pfr. 

 by the basal band. 



