188 
HORN EXPEDITION—MOLLUSCA. 
Shell depresseclly conoidal, s])ire slightly elevated, with an ohtuse summit. 
^\'horls four, of moderately rnpid inerease, suture impressed but not channelled. 
Last whoil flatly convex, broadly convex periphei'ally, merging into the flatly 
convex base ; umbilicus wide and perspective, about one-third the width of the 
shell. Aperture not descending, roundly lunate ; peristome thin, margins callously 
joined, the columella-border distinctly everted. The sculpture consists of slender, 
elevated, acute, deeply-ai’ched riblets extending from the suture to the umbilical 
crater, with smaller intermediate ones which arise on the peripheral area. The 
interspaces are spirally striate, and, intercrossing with the minor riblets, produce a 
reticulate ornament. 
The colour is pale horn : feebly flame-painted with rufous, more conspicuous 
on the base of the shell. 
Dimensions. —Basal diameters, 2-75 and 2-5 ; height, 1‘25 (vix.) 
Localily. —Reedy Creek, in George Gill’s Range. 
This species resendjles Helix paradoxa, Cox, but is more depressed, the spiral 
sculpture more distant and the umbilicus wider. The animal was not studied, but 
by shell characters it should be conspecific with the forenamed species, which Suter 
(Ann. Mag. Nat. Hist., Jan., 1894, p. 64) refers to Laoma., section Phrixgnathus. 
(Jn the other hand, it is also comparable with an undescribed species of Flonnnulina, 
inhabiting South Australia, which possesses the caudal gland, pedal suture, jaw 
and dentition proper to that genus, whilst the form of the shell is more consonant 
with Flammulina than with Laoma. 
Family IIelicida^. 
Group Epipiiallogona. 
Genus Angasella. 
This name was proposed by Adams for the reception of Helix cyrtopleura, 
Pfr., which at that time was so isolated from all other known helicoid shells. 
Pilsbry places subordinate to Planispira, includes four species; to 
this number must be added gascoynensis, Smith, and five described by me in 1894. 
All these, excepting eyrei and subsecta, group themselves around the type-species, 
dift'ering little in shape from one another except in being more planulate or more 
elevated than A. cyrtopleura. Unfortunately none of the species are anatomically 
known, if we except the jaw, which is ribbed ; whilst the granulated apex of some of 
the species further removes Angasella from Planispira. A revision of the genus is 
