NATURAL SCIENCES OP PHILADELPHIA. 145 



I will probably be able to make explorations sufficient to deter- 

 mine most of these doubtful points relating to this and many 

 other species, before the publication of the Conchology of Cali- 

 fornia by the Geological Survey. 



LIMAX (AMALIA) HEWSTONI. Cp. n. s. PI. 3, Pig. B. 1 to 5. 



Sp. ch. Limax "Z. Soicerbii n similis, dorso postice valde carinato et 

 altiore ; clypeo granulatim rugoso, et snlco subelliptico super spiraculo 

 submediano ; colore ex brunneo nigrescens vel supra nigcrrima, later- 

 ibus pallidioribus, disco motivo infra albescens. 



Long, circa duo polliceo, alt. corporis bis major quam lat. disci motivi. 

 Testa oblongo-ovalis, \ poll. 



Similar to L. Sowerbii (of England), the back being strongly 

 carinate even when fully extended, and higher than the front of 

 body ; shield granulate-rugose, and with a groove, sub-elliptic in 

 outline, above the level of the spiracle, which is just behind the 

 middle ; color blackish-brown, or deep black above, the sides paler, 

 the locomotive disk beneath whitish. 



Length about two inches or less, height of body twice the width 

 of foot. Shell oblong-oval, \ inch long. Its other characters 

 agree with those common to most of the subgenera Amalia and 

 Eulimax. The figures best show the comparative points. 



I have named this species in compliment to Dr. George Hew- 

 ston, of this cit}^, who has made many interesting observations on 

 the habits of the species in his garden. 



It is, I believe, the first "Amalia" found in the United States, 

 native or naturalized. In the remarkable groove on the shield it 

 differs from any I find described, but, as this is not apparently 

 connected with any organic difference, it seems merely a specific 



indicate varieties like ours but not described by Binney, while Say's " tur- 

 ritus," is like the young. 



Binney' s figure of the animal of " Tralia," from Charleston, is so much 

 like ours, that it seems probable that it may also be a more southern develop- 

 ment of the Alexia, while his " T. pusilla" from Florida, looks very like 

 some forms of our A. setifer, the revolving lines and labial denticles being, 

 perhaps, more perfect characteristics not found far north. Melampus biden- 

 tatus presents similar variations with a like geographical range. Eastern 

 conchologists may decide whether it is not more likely that the southern 

 shell extends north under a less perfect form, than that the northern shell 

 has come from Europe, and also which of the names quoted is prior, if it is 

 distinguished from the latter. 



