PACIFIC COAST SPECIES. 89 



Limax Hewstoni, J. G. Cooper, Proc. Ac. Nat. Sc. PMla. 1872, 147, pi. iii, fig. B, 1- 

 .5.— W. G. Blnn., Terr. Moll., v, 150. 



Jaw as usual iu the geuus. 



Lingual membrane (Plate 1, Fig. J. of Terr. Moll., V) : the centrals 

 and laterals are of the same type as in L. campestris^ with this impor- 

 tant difference, that there is a well developed cutting point of the usual 

 form (not the peculiar form, as in L. agresiis) to the inner subobsolete 

 cusp of the laterals, and the inner lower lateral expansion of the base 

 of attachment of the laterals is not suppressed as usual to make the 

 laterals asymmetrical. From this it follows that the central teeth are 

 with difficulty distinguished from the laterals, until the outer ones are 

 reached, when the inner cutting point and inner lower lateral expan- 

 sion of the base of attachment are suppressed, as in the other species 

 of Limax. The marginal teeth are not bitid. Teeth 30-1-30, with 14 

 perfect laterals. Fig. v represents the very last marginal. As in the 

 membranes of almost all species of land shells, there is considerable 

 difference in the marginals on different portions of the same membrane. 

 Those figured are the least slender. The specimens examined are 

 from the State collection of California, presented by Dr. J. G. Cooper. 

 This species, by the presence of the inner cutting point of the laterals 

 and non-bifurcation of the marginals, resembles Limax {Amalia) gagates, 

 as figured by Semper (Phil. Archip., Plate XI), and Amalia marginata, 

 as figured by Heynemann (1. c. Plate III, Fig. 7). Goldfuss also fig- 

 ures the dentition of L. marginatus as the same. (Nat. Vereins der 

 preuss. Eheinl. und West. Plate IV, Fig. 3.) 



Dr. Cooper suggests its having been introduced from China or else- 

 where, as he found it only in the city of San Francisco. So far as 

 outward appearance goes, the species somewhat resembles Amalia 

 marginata, Drap., as figured bj^ Lehmaun (Lebenden Schnecken, Plate 

 V, Fig. B). It is, however, by no means certain that it was introduced 

 into San Francisco, as Mr. H. Hemphill has sent me specimens of an 

 Amalia collected from Portland, Oreg., to San Tomes, Lower Califor- 

 nia. His species had about 48 teeth in each row, 16 being laterals, the 

 balance marginals ; a diftereuce of arrangement which may fairly be 

 considered to show a specific difference between his specimens and the 

 San Francisco form, though his discovery leads us to consider Amelia 

 as native to California. 



The oviduct of L. Hewstoni is long and greatly convoluted. The pro- 

 state is well developed. The vagina is very short ; the very short 



