TACHEA. 377 



Lingual membrane (PI. X. Fig. B) long and narrow, quite as in Arionta. 

 Teeth 42—1—42. Another membrane had 190 rows of 43 — 1—43 teeth. The 

 eleventh lateral has a decided side cusp and cutting point. The fourteenth has 

 its inner cutting point bifid. The characters of the individual teeth are shown 

 in the figure, which gives the central, the first, eleventh, fourteenth, thirty- 

 seventh, and forty-second teeth. 



Genitalia (PI. XIV. Fig. C) as usual in Arionta, especially in A. Stearnsi- 

 ana, but with this important difference, that from the base of the dart sac (2) 

 one thread-like organ (3) alone proceeds, the other being replaced by a sponge- 

 like process (1), evidently a form of vaginal prostate. 



EXTRALIMITAL SPECIES OF EUPARYPHA. 



E. levis, Pfeiffer (see L. & Fr.-W. Sh., I. 180), a species of the Lower Cali- 

 fornia fauna, has erroneously been quoted from Columbia River and Southern 

 California. 



TACHEA, Leach. 



Animal heliciform, mantle subcentral; other characters as in Patula. (See 

 Bost. Journ. Nat. Hist., I. PI. VIII.) 



Shell imperforate, globose or subdepressed, white or yellow, ornamented 

 with distinct bands ; whorls 5, the last convex, tumid, descending at the aper- 

 ture ; aperture broadly lunate, obsoletely angular ; peristome thickened, re- 

 flexed, its columellar margin constricted, callous. 



A genus of Middle and Southern Europe, one species also common to Amer- 

 ica, perhaps imported by commerce. 



Our single species, T. hortensis, found only along the northeastern coast, and 

 there usually restricted to the islands, agrees in its jaw 

 with the other known species of the subgenus. It is 

 stout, arched, with blunt, unattenuated ends ; anterior 

 surface with stout, few, separated ribs, denticulating 

 either margin. 



The lingual membrane has 116 rows of 32—1—32 J<™ ot Tachea hortensis 

 teeth each. The centrals have a subtriangular base of 



attachment, so greatly are the lower lateral angles expanded ; upper margin 

 reflected ; reflection pear-shaped, without developed side cusps, but a single 

 6tout middle cusp, half as long as the base of attachment, and bearing a short, 

 conical cutting point, reaching only about one half the distance to the lower 

 edge of the base of attachment ; this cutting point has lateral bulgings. First 

 laterals like the centrals, but asymmetrical by the irregular cutting away of 

 the lower inner angle of the base of attachment ; outer laterals with a more 

 developed cutting point and a decided side cusp and cutting point; the change 

 from the laterals to the marginals is shown in the sixteenth tooth in Morse's 

 figure in L. & Fr.-W, Sh., L, in the eleventh in the membrane figured by me, 



