147 



G-ENUs Comi:n-ella. 



SYNOPSIS OF SPECIES. 



Whorls convex, not shouldered. 



Lirate, posteriorly faintly eostated. 1. C. crassiiia. 

 Strongly lirate and linearly eostated, punctatedly im- 

 pressed. 2. C. pertusa. 

 Costated throughout. 3. C. subfilicea. 

 Plicately-wrinkled ; base smooth. 4. (7. pumila. 

 Whorls shouldered and, except body whorl, strongly cos- 

 tated. 5. C. Clelandi. 

 Species excluded. 

 'C. cancellata, T. Woods, is transferred to Bela as B. Woodsii. 

 C. lyrsecostata, T. Woods, is transferred to JPhos. 



1. Cominella crassina, spec. nov. Plate x., fig. 4. 



Shell excessively strong with the form of the elate variety of 

 •C. alveolata, Kiener, described as C. Adelaidensis, Crosse and 

 Pischer ; the ante-sutaral impression is broad and well defined, 

 the posterior whorls only are faintly costated ; the differential 

 characters are the wide, flat encircling furrows, as wide, or 

 nearly as wide, as the ridges, marked with transverse, curved 

 lines ; the outer lip is strongly ridged within. 



Length, 32 ; breadth, 16 ; length of aperture and canal, 19'5. 



Lacaliti/. — tipper beds at Muddy Creek {J. Bennant'.). 



2. Cominella ? pertusa, spec. nov. Plate ix., fig. 11. 



Shell minute, ovate-oblong; apex small, mamillate, of one and 

 a half whorls with the tip obliquely immersed ; the rest of the 

 whorls four, convex, suture impressed, ornamented with 

 straight, thread-like cost«, about 15 to a whorl, and thick 

 spiral threads punctatedly impressed in the narrow interstices ; 

 spiral threads eight on the penultimate whorl. 



Aperture round, large, emarginate in front ; outer lip a 

 little dilated, faintly tuberculated within, variced behind. 



Length, 4"25 ; breadth, about 2"5 ; length of aperture, 2. 



Locality. — Clayey green sands, Adelaide bore. 



3. Cominella subfilicea, spec. nov. Plate x., fig. 6. 



Shell with the form of O.Jllicea, Adams, and, like it, with 

 costse descending to the base of the last whorl, but it differs by 

 its encircling depressed ridges separated by linear furrows, as 

 in most species of the genus, whereas in the living shell the 

 surface is finely striated and marked with colour lines. 



Length, 20 ; breadth, 9 ; length of aperture and canal, 12. 



Localities. — Oyster banks, Aldinga Cliffs ; and equivalent 

 beds at Hallett's Cove, St. Vincent Gulf. 



