197 



beaded cinguli fenestrated in the sulci ; the last whorl usually 

 with ten cinguli ; there is no umbilicus and no prominent beaded 

 cingulus bounding the umbilical region. 



Dimensions. — Height, 5 (vioi); basal diameters, 4 and 5. 



Habitat. — West Australia ; exact locality not known (six 

 examples). 



Euehelus ampullus, >iptc. nor. ri. i./fig. 5. 



Sliell globose-conic, imperforate in the young, narrowly umbili- 

 cated or reduced to a fissure in the adult ; whitish, sjootted w^ith 

 red on the revolving ribs ; spire-whorls quadrate, separated by a 

 linear suture ; last whorl convex, except a little flattening at the 

 suture. 



Ornament of penultimate whorl consisting of tliree equally 

 thick, obtuse, and plain cinguli, separated from one another and 

 from the sutures by nearly equal intersjDaces, with or without a 

 small riblet in each interval ; all over regularly clathrate, the 

 interstitial pits narrowly oblong. Last whorl with about eight 

 cinguli, clathrate in the intervals : the supra-peripheral intervals 

 with a riblet ; the four l)asal cinguli granulose. 



Aperture roundly oval, outer and basal margins smooth 

 within ; columella arcuate, slightly explanulate concave, 

 <3dentulous. 



Dimensions. — Height, 11 '5; l)asal diameters, 9-25 and 11 "5. 



Locality. — Prolmbly Cambridge Gulf, X.W. Australia (several 

 examples). 



A ffiniti/.— This species will fall into Pilsbry's Section Hybo- 

 chelus. Of the four described species F. Delpreti is the only one 

 with the basal diameter equal to the height ; in the others the 

 proportion of the height to the diameter is 100 to 120-130. B. 

 fossulatus has four principal lir^e on the penultimate whorl. E. 

 mysticus is imperforate. In E. cancellatus and E. Delpreti the 

 number of the basal cinguli is greater than in the present species, 

 the latter having two cinguli on the penultimate whorl. 



EXPLAIN ATIOXS TO PLATE I. 



Fig. 1-1 rt. Clanculns consobrinus, Tate. 2 x. 



" 2. Eiichelus fenestratus, Tate. 5 x. 



" 3. Euehelus pumilio, Tate. 2 x. 



" 4. pAichelus vixumbilicatus, Tate. 3 x. 



" 5. Euehelus ampullus, Tate. l*5x. 



" 6. Thalotia neglecta, Tate. l'5x. 



" 7. Calliostoma spinulosum, Tate. 3 x and magnified ornament. 



" 8-Sa. Clanculus euchelioides, Tate. 3 x (vix). 



9. Turbo rutidoloma, Ta^^. 1-5 x. 



" 10. Sipho {':) minieticus, Tafe. 2 x. 



" 11. Columbella (Mitrella) vincta, Tafe. 2 x. 



*■ 12. Bittium estuarinum, J'ft;'^. Nat. size, and magnified ornament. 



" 13-] 3a. Torinia foveolata, 7'a/e. 3 x. 



