Laoma.] GASTROPODA. 761 



rapidly increasing, rounded ; periphery and base convex. Suture im- 

 pressed. Aperture large, rather oblique, subcircular, broader than 

 high. Peristome thin, regularly arched. Columella arcuate. Inner 

 lip thin, slightly reflected. Umbilicus rather large, about one-fifth of 

 the diameter of the shell, gradated, pervious. 



Diameter Maj., 1-75 mm. ; niin.. 1-5 mm. : height, 0-75 mm. 



Animal. Body short, eye-peduncles long and thick, tentacles 

 short ; mantle rather posterior, enclosed ; foot narrow, without 

 locomotive disc, pointed behind, not extending beyond the shell ; no 

 caudal gland. Colour pale grey, eye-peduncles and a stripe on each 

 side of the head dark sooty-brown. (Hutton.) 



Dentition. Hutton, T.N.Z.I., xvi. 166, pi. 9, f. Q; Suter, I.e., 

 xxvi, 130, pi. 17, f. 20, 21. 



Jaio composed of papillate plaits. 



Radula with the formula 13+ 1 + 13 ; teeth normal. 



Type in the Canterbury Museum, Christchurch. 



Hob. North Island : Whangarei ; Waitakerei Range (H. S.) ; 

 Mount Wellington lava-fields (Musson) ; Wairangi (A. Suter) ; Wai- 

 marama ; Kaiti, Gisborne ; near Waitomo Caves (A. Hamilton) ; 

 Napier. South Island : Nelson ; Eyreton, type (Professor Chilton) ; 

 Christchurch ; Little River (H. S.) ; Ashburton (W. W. Smith) ; 

 Dunedin (A. Hamilton). 



Subsp. raricostata, Suter, 1890. Plate 30, fig. 8. 



Patula raricostata, Sut., T.N.Z.I., xxii, 1889 (1890), 226, pi. 14, f. 9, a, b. 

 P. (Charopa) raricostata, Sut., Man. Conch. (2), viii, 100, pi. 19, f. 22-24. 

 Laoma (Phrixgnathus) raricostata, Sut. : Hedley and Suter, P.L.S. N.S.W. 

 (2), vii, 649 ; Suter, J. de Conch., xli, 280. 



Distinguished from the species by the following characters : The 

 shell is very slightly larger, more solid, not shining. The radiate 

 riblets are stronger and more distant, only about 5 per millimetre. 

 The whole of the protoconch is smooth, and the microscopic spiral lirae 

 are more distant. The colour is dark olive. The periphery is sub- 

 angled, though sometimes very indistinctly, and the number of whorls 

 is 4|. The umbilicus is a little wider, about a quarter of the diameter. 



Diameter, 2 mm. ; height, 1 mm. 



Type in my collection. 



Hob. North Island : Forty-mile Bush, type (H. S.) ; Waimarama 

 (A. Hamilton). South Island : Duuedin (A. Hamilton). 



37. Laoma sciadium, Pfeiffer, 1857. Plate 30, fig. 9. 



Helix sciadium, Pfr., P.Z.S., r 1857,"108 ; TM.H. Viv., iv, 112 ; Hector, Cat. 

 Land Moll. N.Z., 15 ; M.N.Z.M., 19. Trochomorpha sciadium, Pfr., 

 Nomencl. Hel. Viv., 81. Phrixgnathus sciadium, Pfr. : Hutton, T.N.Z.I., 

 xvi, 197. Laoma (Phrixgnathus) sciadium, Pfr. : Hedley and Suter, 

 P.L.S. N.S.W. (2), vii, 650 ; Suter, J. de Conch., xli, 277. 



Shell small, conoidly semiglobose, umbilicated, rather solid, 

 striated, corneous variegated with reddish, shining, pellucid. Sculp- 



