DRYM^US, AVEST INDIES. 7 



ored specimens were collected with typical dominions on the Caloosa- 

 hatchie river by C. W. Johnson. 



Pfeiffer's B. floridanus (name pre-occupied by Conrad), was based 

 upon slender specimens with interrupted bands. Whether the figures 

 given by Binney (copied on my pi. 5, figs. 19, 20), are floridanus 

 or not, they certainly do not represent Pfeiffer's type, as he mentions 

 no bandless form of his species. See W. G. Binney, Terr. Moll, iv, 

 pi. 79, f. 3 ; L. and Fr.-W. Sh. N. A., f. 338 ; Terr. Moll, v, f. 282 ; 

 Man. N. A. Land Shells, f. 448; Third Suppl. to Terr. Moll, v 

 (Bull. Mus. Comp. Zool. xix, no. 4), pi. 3, f. 7 ; also Wright, Nauti- 

 lus iv. p. 62. The above references to Binney's work do not include 

 his description, which is in each case an inaccurate translation of 

 Pfeiffer's diagnosis. As the name is pre-occupied, and in all prob- 

 ability a pure synonym of dominicus, it had better be dropped. 



In conclusion : Throughout its range, D. dominions show's no ap- 

 preciable variation in texture or sculpture ; it varies in degree of in- 

 flation, the variation not being correlated with geographic location. 

 It varies in coloration, the typical pattern occurring in Haiti, Cuba, 

 Florida and Mexico, forms with subcontinuous bands and of larger 

 size in Cuba and Florida, and bandless forms in Florida only, so far 

 as known, though often associated there with banded individuals. It 

 attains a larger size in Florida than elsewhere. All the synonyms 

 are based upon specimens with dotted bands above. 



The distribution of D. dominions is enigmatic, but D. mutt/lineatus, 

 the melanocheilus group of Orthalicus^ and Cerion uva, offer similar 

 anomalies. 



D. HJALMARSOXI (Pfeiffer). 



Shell subperforate, oblong-fusiform, thin, nearly smooth (seen 

 under a strong lens to be very finely decussated), shining, diapha- 

 nous, whitish, indistinctly painted with series of spots. Spire long- 

 conic, rather acute. Whorls 6, moderately convex, the last as long 

 as the spire, somewhat attenuated at base. Aperture oblique, oblong- 

 oval ; peristome thin, narrowly expanded; columella thread-like, 

 slightly arcuate, entering; the columellar margin slightly dilated 

 above, nearly adnate. 



Alt. 21, diam. 9, length of aperture 11, width 5| mill. (Pfr.). 



Pojas plantation, Manatl, Porto Rico (Iljalmarson). 



Bidimus Itjalmarsoni PFR., Malak. Bl. iii, 185G, p. 51 ; Monogr. 



