LIMAX. 151 



rugose, and with a groove, subelliptic in outline, above the level of the res- 

 piratory orifice, which is just behind the middle ; color blackish-brown or deep 

 black above, the sides paler, the base of foot whitish. Length, 2^ inches or 

 less, height of body twice the width of foot. 



Internal plate oblong-oval, £ inch long. Gardens in San Francisco. 



Limax Hewstoni. 



In the remarkable groove on the mantle it differs from others described. 

 This does not coincide with the outline of the attached portion of the mantle, 

 or with the internal plate. It is sometimes scarcely visible. (Cooper.) 



Limax Hewstoni, J. G. Cooper, Proc. Ac. Nat. Sc. Phila. 1872, 147, PL III. Fig. 

 B, 1 - 5. 



Jaw as usual in the genus. 



Lingual membrane (PI. I. Fig. J) : the centrals and laterals are of the same 

 type as in the last species, with this important difference, that there is a well- 

 developed cutting point of the usual form (not the peculiar form, as in L. 

 agrestis) to the inner subobsolete cusp of the laterals, and the inner lower lat- 

 eral 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 cen- 

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

 are reached, when the inner cutting point and inner lower lateral expansion of 

 the base of attachment are suppressed, as in the other species of Limax. The 

 marginal teeth are not bifid. Teeth 30 — 1 — 30, with 14 perfect laterals. Fig. 

 c represents the very last marginal. As in the membranes of almost all spe- 

 cies 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., PI. XL), and Amalia marginata, as figured by Heyne- 

 mann (1. c. PI. III. Fig. 7). Goldfuss also (1. c. 1856, PI. IV. Fig. 3) figures 

 the dentition of L. marginatus as the same. 



Dr. Cooper suggests its having been introduced from China or elsewhere, 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 by Lehmann (Lebenden Schnecken. PI. V. Fig. 

 B). It is, however, by no means certain that it was introduced into San Fran- 

 cisco, as Mr. H. Hemphill has sent me specimens of an Amalia from Los An- 

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



