Lamellar iu.} GASTROPODA. 295 



Diameter Maj., 11'5 mm. ; min., 8mm. : height, 10mm. 



Animal with the mantle smooth, covering the whole shell, not 

 fissured at the back, notched in front ; yellowish or white, marbled 

 with grey, and usually with 2 blackish patches. Foot small, square 

 in front, tapering behind, entirely covered by the mantle. Top of 

 the head dark grey or purple ; eyes at the outer bases of the ten- 

 tacles, which are large and distant. (Hutton, T. N.Z.I., xv, 121.) 



Dentition 1 + 1 + 1 ; central tooth with the base produced into 

 two long processes ; the anterior end slightly reflected and trilobed ; 

 lateral teeth versatile, broad, situated at some distance from the 

 central tooth, their apices acute, uncinate, and denticulated on the 

 inner side. (Hutton, I.e., 121, pi. 13, f. W.) 



Type in the British Museum. 



Hab. Auckland, type (Greenwood) ; Narrow Neck Reef, Taka- 

 puna, and Orakei (H. S.) ; Islet Reef, Cook Strait ; Cape Farewell ; 

 Kermadec Islands (Haylock) ; Snares, 50 fathoms, one young shell 

 (Captain Bollons). Found under loose stones at low-water mark. 

 Victoria, South Australia, and Tasmania. 



Fam. TRICHOTROPID^I, Gray. 



Animal with a short broad head ; tentacles somewhat distant, 

 with eyes about their middle ; foot elongated ; siphon very short, 

 but evident. Radula 2+1+1+1 + 2; the central tooth sub- 

 quadrangular, multicuspid ; laterals large, transverse, with finely 

 crenulated margin ; marginals curved, sharp, simple. 



Shell thin, turbinated, carinated, the ridges bearing epidermal 

 fringes in fresh or living specimens, umbilicated ; aperture angulated 

 or subchannelled below, lip sharp, columella obliquely truncated. 

 Operculum generally lamellar, with apical nucleus. 



KEY TO GENERA. 



A. Shell turbinate, umbilicus narrow or closed . . . . TRICHOTBOPIS. 



B. Shell discoidal, largely urnbilicate, the last whorl sometimes 



separated . . . . . . . . . . LIPPISTES. 



[Genus 1. TRICHOTROPIS, Broderip and Sowerby, 1829. 



Trichotropis, B. & S., Zool. Joum., iv, 1829, 373. Type : Turbo bicarinatus, 

 Sow. Trichophora, Deshayes, 1830. 



Animal having the foot oval, lanceolate, rounded in front, angulate 

 laterally, and attenuated behind. Intromittant organ falcate. 



Shell thin, rather small, turbinate, dilated below. Spire short, 

 angular, and shouldered. Whorls not numerous, first convex, then 

 angular, ornamented with spiral cords, crossed by finer radiate 

 sculpture ; epidermis fringed upon the ridges, but very easily rubbed 

 off. Last whorl large ; base with a carina around the umbilicus. 

 Aperture auriform, angled above, and terminating below in an angular 

 beak. Columella smooth, concave, narrowed below. 



