1898.] NATURAL SCIENCES OF PHILADELPHIA. 239 



Professor Cockerell defines a color-form maculatus as follows : 

 " This much resembles A. hemphilli var. maculatus, but is larger 

 and stouter, and has the lateral areas of the sole marbled as in 

 niger. Two specimens were received from Dr. Cooper, who found 

 them at Haywards, Cal." The maculated form is shown in our 

 figures. It seems more abundant than the spotless slug, but in our 

 series it is difficult to separate the two, as some which appear spot- 

 less often show a few macula? on close examination. 

 H. Hemphilli (W. G. Binney). 



Ariolimax Hemphilli W '. G. Binney, Ann. Lye. Nat. Hist. N. Y., XI, p. 181, 

 pi. xii, f. 7 (genitalia), pi. xviii, f. H (teeth) (1875) ; Terrestr. Moll., V, p. 

 235, f. 134, pi. v, f. H (teeth), pi. xii, f. G (genitalia) ; Man. Amer. Land 

 Shells, p. 102, f. 65. Third Suppl. Terr. Moll., v, p. 212, pi. v, f. G. Cock- 

 erell, Ann. Mag. N. H. (6), vi, p. 278. 



Ariolimax Hemphilli var. maculatus Ckll. in Binney, Third Supplement to 

 Terr. Moll., V, p. 212, pi. v, f. B. 



Since its first publication in 1875, nothing material has been 

 added to our knowledge of this species. Its generic position is un- 

 certain. The desirability of procuring additional specimens in 

 order to place the form upon a better basis will be evident. The 

 type locality is Niles Station, Alameda Co., California. 



Professor Cockerell's color-form maculatus has been figured in 

 Binuey's Third Supplement, but not before described. "Small 

 spotted hemphilli found by Dr. Cooper at Haywards. When alive, 

 as I learn from Dr. Cooper, they are reddish, the spotted variety of 

 niger being gray ; in alcohol, both appear -gray. They agree with 

 hemphilli W. G. B. in the genitalia, and differ also from niger in 

 their more slender form and immaculate sole of foot. Indeed, com- 

 paring them with typical niger, they appear fundamentally distinct 

 in every way, but the var. maculatus of niger is strangely interme- 

 diate — just what one might expect a niger X hemphilli hybrid to 

 be." (Ckll. ms.). 



Genus ARION Ferussac. 



Conspicuous in the European fauna for the number of species 

 and individuals, and for the large size and frequently brilliant col- 

 oring of some forms, this genus is represented in America by one or 

 two species introduced from Europe and still very local in distribu- 

 tion. They have not yet exhibited the tendency to spread charac- 

 teristic of the introduced Limaces. 

 Arion hortensia Fer. PL XV, figs. 79, 82, 83; PI. XIV, fig. 72. 



Numerous specimens of this species were collected in March and 

 April, 1896 near or in a greenhouse in Seattle, Washington, by Mr. 



