392 GASTROPODA. (Pectinibranrhia . 



left and its base moderately notched. Outer lip sinuate above and 

 below, convex at the middle, strengthened by. an outer axial rib. 

 Columella short, straight, bent to the left below, excavated above- 

 to ward the lightly convex parietal wall ; at the base the columella 

 is slightly twisted and forms an inconspicuous fold. Inner lip smooth, 

 narrow, with a slight vertical outer groove towards the siphonal fascicle, 

 which is lamellate, convex, with an outer groove and a narrow ridge, 

 being the continuation of the basal margin. Operculum not seen. 



Diameter, 9 mm. ; height, 17 mm. 



Animal unknown. 



Type in the Tasmanian Museum, Hobart. 



Hob. Milford Sound, 100-120 fathoms (Professor Chilton). The 

 type is from Eagle Hawk Neck, Tasmania. 



Remark. Two specimens, one immature, were dredged by the 

 scientific party visiting the Sounds in December. 1908. It adds a 

 genus and a species to our fauna. 



Subfam. 3. PISANIIN.E. 

 Notch on the base of the canal moderate, fasciole not carinated. 



Genus 3. PISANIA, Bivona, 1832. 



Pisania, Bivona, Effem. sclent., 1832, 55. Type : Murex pusio, L. Pusio, 

 Gray, 1833. Proboscideu. Schmidt, 1832 (tesie Herrmansen). Evarne, 

 Adams, 1858 (leste Zittel). Algrus, de i-Jregorio, 1885. 



Animal having the foot subtruncated in front and the sides angular ; 

 tentacles with the eyes near their bases ; male organ long and narrow. 

 Central tooth of radula with 3 to 5 denticles, lateral teeth tricuspidate, 

 the median cusp small. 



Shell elongated oval, solid, of moderate size ; spire conical, elevated ; 

 whorls but little convex, suture not deep, the last whorl high, basal 

 fasciole obsolete ; aperture high, oval, narrowly channelled above, 

 with a short open canal below, its base slightly notched ; columella 

 concave at the middle ; outer lip varicose, finely denticulate inside. 

 Operculum horny, unguiform, somewhat arched, nucleus apical. 



Distribution. Mediterranean, Antilles. Indian and Pacific Oceans, 

 Australasia. 



Fossil in the Tertiary. 



1. Pisania reticulata, A. Adams, 1855. Plate 45. fig. 12. 



Pisania reticulaia. A. Ad., P.Z.S., 1854 (1855), 138: Man. Conch. (1). iii, 

 147, pi. 71, f. 201 ; Index, 73. 



Shell elongately oval, solid, yellowish- brown, finely reticulate, outer 

 lip with a prominent varix in the adult. Sculpture consisting of 

 numerous fine spiral lira*, reticulated by axial fine flexuous riblets ; 

 there is usually a, varix on the penultimate whorl, and one on thr 

 body-whorl opposite the outer lip. besides the varix on the latter. 



