Schizoglonsa.] GASTROPODA. 78^ 



Generative Organs. The male organ is a short tube, and exhibits 

 little difference from the vas deferens, except that is is slightly wider ; 

 the latter is a short tube not sharply marked off from the verge. There 

 is no spermatheca. Albumen-gland large. 



Egg white, hard-shelled, oval, coarsely granular. Length, 4 mm. ; 

 diameter, 3 mm. Mr. Murdoch found the eggs to be laid in August, 

 and they are found principally under a good thickness of decaying 

 fern-leaves, in little heaps of from 6 to as many as 14. 



Type in the K.K. Hof museum, Vienna. 



Hob. North Island : Kakepuku Mounts in, Waika to (Hochstetter) ; 

 Wainuiomata ; Toko, near Stratford (Murdoch) Ohingaiti (Preston) ; 

 Cape Egmont ; Wanganui ; Hunterville ; Great Barrier Island ; 

 Whangarei Heads (Alfred Suter). Subfossil and very large shells : 

 Cave near Tahora, Gisborne district, together with moa-bones ; 

 Mangaone Cave, near Nuhaka, Hawke's Bay (Hamilton and Hill). 



Schizoglossa has a liking for Otoconcha, and will eat this mollusc 

 in preference to the common earth-worm. 



Vernacular Name. Paua-slug (Great Barrier Island). 



Genus 4. DELOS. Hutton, 1904. 



Delos, Hutton, P.L.S. N.S.W., xxix, 1904, 461. Type : Zoniles (?) coresia, 

 Gray. Elcea, Hutton, T.N.Z.L, xvi, 1883 (1884), 207 ; not of Ziegler, 

 1833. Rhenea, Hutton, P.Z.S. N.S.W. (2), vii, 1893, 631, footnote : 

 not of Saalmiiller, 1884. 



Animal having no caudal mucous pore and no jaw. Kadula with 

 aculeate teeth. Reproductive organs simple. Ovoviviparous. Car- 

 nivorous. 



Shell usually small ; epidermis thin, not involving the peristome ; 

 umbilicus wide or moderate ; whorls few, rapidly increasing. 



Distribution. New Zealand (two species) ; Tasmania (D. nelson- 

 ensis, Braz., D. Dyeri, Pett.) ; east coast of Australia (D. splertdidula, 

 Pfr.) ; Tonga (D. gradata, Gould). 



KEY TO SPECIES. 

 n. Adult shell with 3 whorls ; diameter, 4 mm. ; radially striate, 



spiral lines usually indistinct . . . . . . . . coresiu. 



aa. Adult shell with 4 whorls ; diameter, 7 mm. ; radially strongly 



plaited or rib-striate, spiral lines always distinct .. .. Jeffrey-sin mi. 



[. Delos coresia, Gray, 1850. Plate 31. fig. 1. 



Zonites ('() coresia, Gray, P.Z.S., 1849 (1850), 166; A.M.N.H. (2), vii, 66. 

 Helix coresia, Gray, Conch. Icon., vii, pi. 132, f. 807 ; Pfeiffer, M.H. Viv., 

 iii, 92 ; Conch. Cab. (2), i, pt. 2, 459, pi. 155, f. 23-26. H. (Paryphanta) 

 coresia, Gray : Hector, Cat. Land Moll. N.Z., 10. Paryphanta coresia. 

 Gray : Hutton, M.N.Z.M., 24. Elcea coresia, Gray : Hutton, T.N.Z.L. 

 xvi, 207 ; Man. Conch. (2), i, 130, pi. 26, f. 15. Rhenea coresia, Gray : 

 Hedley and Suter, P.L.S. N.S.W. (2), vii, 631 ; Suter, J. de Conch., 289. 



Shell very small, subdiscoidal, broadly umbilicated, olive-horny, 

 sometimes fuscous-streaked, substriated, thin, pellucid, shining. Sculp- 



