GUDE: ON THE GENUS STREPTAXIS AND ITS ALLIES. 203 
Venezuela, and as far north as Trinidad and Barbados, while on the 
west coast they extend from Peru to New Grenada. One species 
is of unknown habitat. 
The genera Happia and Scolodonta are almost confined to South 
America, ranging from Argentina in the south, through Brazil, as far 
north as St. Vincent and Grenada in the West Indies, and on the 
west coast from Chili to Ecuador; one species is found in the 
Comoro Islands and one in Tonkin. 
No fossil forms of Streptaxis are known. Mr. Sykes and Mr. Bullen 
Newton have kindly called my attention to the fact that Omphaloptyx 
supracostata, Boettger, from the Upper Oligocene, is supposed to be 
allied to Streptavis. A statement to this effect appears in some 
books, notably Fischer’s Manuel de Conchyliologie (1888, p. 453) and 
Tryon’s Structural and Systematic Conchology (vol. ili, 1884, p. 16) ; 
but a reference to Boettger’s original words ! shows it is to Hnnea, and 
not to Streptaxis, that Omphaloptyx is considered to be related. 
Several species having remained unfigured, I have thought it useful 
to figure these so far as possible, and Mr. E. A. Smith, with his 
customary courtesy, has given me access to some of Pfeiffer’s types 
in the British Museum. These are S. Leonensis, S. eburneus, 
S. gibbosus, and SS. sinuosus. Two other unfigured species are 
S. Anceyi, Mab., and S. diplodon, MUldff., which I am also enabled 
to illustrate from specimens in the British Museum. 
While looking over the collection at the British Museum I found 
a tablet with two shells labelled S. subbudbulus, Mlldff., apparently an 
unpublished name. Dr. von MOollendorff informs me that he has no 
recollection of the shells, and since Mr. Smith states that they were 
received from Mr. Fruhstorfer, it would appear that the latter has 
attached the above manuscript name to them without Dr. von 
Méllendorff’s authority. I append a short diagnosis of this species. 
[P.S.—It has since been described by Dr. von Méllendortf* as a new 
subspecies of S. Stamensis, Pfr., but I still consider it worthy of 
specific rank. | 
STREPTAXIS suBBULBULUS, Mlldff. Pl. IV, Figs. 16-18. 
Shell whitish, diaphanous, narrowly umbilicated, depressed, sub- 
cylindrical, strongly costulate above, shining below, strongly costulate 
inside the umbilicus; whorls 63, rapidly increasing, the last gibbous 
behind the constricted aperture ; aperture semi-ovate, upper margin 
sinuate, receding slightly, peristome strongly thickened and reflected ; 
parietal wall with one entering compressed fold, three equidistant 
conical teeth on the peristome, one on the right margin, two basal. 
Alt. 9, diam. 8 mm. 
Hab.—Siam: Hinlap. Two specimens. 
Type in the British Museum. The new species resembles S. bulbulus 
in outline, but it is smaller and the teeth on the peristome are 
differently arranged. 
1 Berichte Senck. Naturf. Ges., 1873-4, p. 64. 
* Nachr. Blatt. Deutsch. Malak. Ges., 1902, p.. 104. 
