DRILLIA. 197 
by Weinkauff to E. Africa, possibly through mistaking for it 
poor examples of D. Barkliensis. Weinkauff attempts to sepa- 
rate Kiener’s figure of D. zebra from that given by Reeve, and 
refers the latter, as a synonym, to D. ornata, d’Orb.; but Kiener’s 
figure represents the ordinary West Indian form quite as well as 
does that of Reeve. There are a number of synonyms: D, 
albinodata, Reeve (fig. 5), having the periphery more sharply 
angulated than usual, the figure magnified, D. albocincta, C. B. 
Adams, D. albomaculata, d’Orb. (fig. 11), which E. A. Smith 
changed to D. albopustulata, under the impression that the 
species (above mentioned) described by C. B. Adams, bore the 
same name as d’Orbigny’s, D. ornata,d Orb. (fig. 12), D. zebroides, 
Weinkauff (fig. 15), D. pulehra, Gray (fig. 18, magn. 2), D. 
Jayana, C. B. Adams, D. cinerea, Weink. (fig. 10), D. collaris, 
Sowb. (fig. 7). 
As will be seen from a comparison of the above figures D. zebra 
is a very variable species; one of its extreme forms may be 
separated as 
Var. LEUCOCYMA, Dall. Pl. 34, fig. 2. 
Compared with albomaculata, d’Orb., it is more slender, with 
the periphery-angle bearing a pair of close revolving ribs, more 
conspicuous than the rest of the spiral sculpture and tipped 
with white where crossing the longitudinal ribs. 
Sarasota Bay, W. Fla. 
In the typical albomaculata the coloring is similar, but a single 
broader rib revolves at the periphery; in some specimens, how- 
ever, there is a more or less distinct impressed line on the middle 
of the rib, so approximating it to this variety. 
D. OSTREARUM, Stearns. PI. 34, fig. 79. 
Concavely, rather narrowly shouldered, with a thread-like 
raised line at the suture, closely longitudinally ribbed below the 
periphery, decussated by raised revolving lines; dingy yellow to 
purplish black. Length, 16 mill. 
W. Coast of Florida (on oysters). 
Figured for the first time, from a specimen in Coll. Acad. 
Philad. 
D. cANCELLATA, Gray. Pl. 15, fig. 19. 
Whorls keeled at the upper part, transversely very finely 
