162 
ture : irregular, distant growth lines, and close-set microsco- 
pic grains (fig. 2). Aperture very oblique, nearly horizontal : 
lip entire, a little curled back, broadly expanded. Maj. 
diam., 19 mm.; min. diam., 15 mm.; height, 6 mm. 
A smaller, less sharply keeled specimen from the Mann 
Range is regarded for the present as a variety. 
Compared with its nearest ally, T. howardi, Angas, the 
novelty is smaller, flatter, without colour bands, but with 
more decided granular sculpture. A specimen which I dis- 
sected containing a generative system characteristic of Tlier- 
sites, and comparable to that of T. f^e fir/era, Tate, Horn Ex- 
ped., Zool., p. 222, fig. F. 
Hah. — Musgrave Ranges. 
Xanthomelon sublevatum, Tate. 
Plate XXX., figs. 7, 8, 9. 
Thersife.s siihlerata, Tate, Rep. Horn Exped., Zool. ii.. 
1896, p. 196, PI. xvii., fig. 5. 
A specimen from the Musgrave Ranges extends the 
known distribution of this species. It was identified by com- 
parison with examples named by its author. As the figure 
quoted is unsatisfactory, others are now presented. 
Xanthomelon perinflatum, Pfeiffer. 
Apparently this snail is both most numerous individually 
and widest spread in this region. Its range is discussed by 
Professor Tate (op. rif., p. 198). 
Hab. — Musgrave Ranges. 
Xanthomelon fiindersi, Ad. & Angas. 
Hab. — Musgrave Ranges. 
Xanthomelon an^asianum, Pfeiffer. 
Hab. — Musgrave Ranges. 
Xanthomelon clydonigerum, Tate, var. 
Plate XXX., figs. 10, 11, 12. 
T/tersites ( ijrlyptorJuigada) clydonigera, Tate, Rep. Horn 
Exped., Zool. ii., 1896, p. 195, PI. xix., fig. 24. 
The type of this species, now in the possession of Dr. J. 
C. Verco, is bleached, and, through a malformation of the 
later whorls, is subpcalar. Compared with Mr. Basedow's 
examples the unique type is, therefore, more elevated ; it is 
also smaller and rather more coarsely sculptured. As the 
type is not only in poor condition, but distorted, I have hesi- 
tated in regarding the apparent difference as of specific value, 
and have compromised by offering a description and figures 
of the shell obtained bv Mr. Basedow under this title. 
