194 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



as in aspersa, little branched (much branched in aspersa), the longest 

 about 12 mm. The filiform glands are thus more like those of nemoralis 

 than aspersa. Flagellum very long (38 mm.), spirally twisted in 

 middle ; penis retractor to vas deferens about 5 mm. Spermatheca 

 very long (prox. 48 mm.), slender, and cylindrical, with a basal coecum 

 imbedded in uterus. (All measurements from fresh material.) 



On comparing the genitalia with those of Leptaxis {Crypitaxis) 

 undata (Lowe),^ from Funchal, Madeira, it at once appears that 

 there is little affinity, in spite of a certain similarity in the sculpture 

 of the shell. I give a figure of the genitalia of L. undata (Fig. 2), 

 showing the filiform glands, short (11*5 mm.) flagellum, and boot- 

 shaped end of spermatheca, all very different from Idiomela. The 

 albumen-gland is about 10 mm. long. In the Grwatkin collection at 

 the British Museum I found radulse and jaws of a number of 

 Madeiran Helicoids — even a radula of H. suhplicata, exactly like my 

 specimen, but erroneously labelled " Madeira ". The following notes 

 will serve to show some of the various differences between these 

 snails and H. suhplicata. 



Leptaxis, sens. Pilsbry. 



L. eruhe-scens , Lowe (type of genus). Median teeth small, with 

 rudimentary side cusps ; first laterals with well-developed ectocones ; 

 marginals with inner cusps broad, feebly to strongly emarginate ; 

 outer cusp bifid or trifid, if bifid it is the outer lobe that is obsolete 

 (Fig. 4). 



L. undata, Lowe (Gryptaxis). Lateral cusps of median teeth more 

 distinct but small ; laterals with distinct but little produced 

 ectocones, often slightly emarginate ; marginals with inner cusp 

 strongly emarginate, the lobes very obtuse, the outer cusp simple 

 by the suppression of the outer lobule, or the latter may be slightly 

 developed (Fig. 3). 



L. phlehophora, Lowe (Katostoma). Jaw with about twenty-six 

 flattened contiguous ribs, somewhat as in H. terrestris, Penn. ; 

 median and lateral teeth with small, hardly produced, outer cusps ; 

 marginals with inner cusp deeply bifid, obtuse, outer bilobed (Fig. 5). 



L. portosanctana, Sowerby (Pseudocampylcea). Sowerby's original 

 paper has the name portosanctance, possibly a misprint. Jaw with 

 fourteen broad, closely set ribs ; central teeth with well-developed 

 side cusps ; laterals with well-developed ectocones ; marginals 

 with very broad inner cusp, simple or feebly emarginate ; outer 

 Avith two or three sharp points. The lateral cusps of central teeth 

 are little produced (Fig. 6). 



^ Unfortunately the name of this common Madeira snail must be changed, 

 since there is an earlier name, Helix undata Gmelin, 1790, based on an entirely 

 different shell, figured by Gualtieri. Gmelin gives no locality, but Wood 

 (" Index Testaceologicus," 1825) says it is from New Holland. Helix undata 

 Lowe, Cambr. Phil. Soc. Trans., iv, p. 41 (1831) must be called Leptaxis 

 {Cryplaxis) groviana (Ferussac). 



