131 



deed, are scarcely distinguishable from the centrals. L. agrestis has also 

 a peculiar inner cutting- jjoint to its laterals. L. campestris has the same 

 type of central and lateral teeth as the species under consideration, but 

 its inner marginals are simple, not bifid. L. Weinlandi, known only by 

 its dentition, no description of its external characters or genitalia having 

 been published (see Hynemann, Malak. Blatt., X, 212, pi. ii, fig. 1), 

 differs from this species by having all its marginals simple. 



The above comparison of the dentition is given in detail, because it 

 is on its lingual membrane that I am forced to rely for decided specific 

 characters ; the external characters of the animal being of little value 

 in alcoholic specimens. 



In the genital system, there are no accessory organs. The penis-sac 

 is as long as the vagina, with a constriction near its commencement, 

 and tapers above to a point, below which it receives the vas deferens. 

 The genital bladder is oval, with a very short duct entering the vagina 

 above the penis-sac. 



Camp 9 : Hot Sulphur Springs . 1 specimen. 



Eemarks. — My notes taken on the spot were lost. The externa 

 characters of the animal in alcohol are unreliable, hence the brief de 

 scription. 



Limax castaneus, sp. NOV. 



Small and slender ; length less than one inch; color, a lively hroivn, icith 

 a darJcer spot over the shield ; head, tentacles, and eyestalks blacJc. Bottom 

 of foot tchite. 



Jaw as usual ; lingual dentition as in the other form, but differing in 

 having only 34-1-34 teeth, with 12 perfect laterals. This important 

 difference is such as to warrant the belief that the form may prove a 

 distinct species. Genitalia not examined. 



Camp 10-11 : Blue Eiver Valley 5 specimens. 



Eemakks. — The above Limaces were submitted to Mr. W. G. Binney 

 for anatomical examination. The drawings and descriptions of the jaw, 

 lingual apparatus, and genitalia of both reproduced in the plate were fur- 

 nished by him, to whom really belongs the credit of discriminating their 

 specific distinction. 



Limax campestris, Binney. — Truckee, Nevada, 5,866 feet {Cooper), is 

 the only other mention I can find of the occurrence of this family in the 

 central basin. 



HELICIN^. 



Patula Cooperi, W. G. Binney. 



Camp 9 : Hot Sulphur Springs, Middle Park 7 specimens. 



Camp 11 : Blue Eiver Valley 30 specimens. 



Lakes, San Luis Valley 2 specimens. 



California to Nebraska, Montana to Arizona. Most of the many 

 recorded localities are in the mountains ; the highest being 5,500 feet. 



Remarks. — This well-known Helix, the largest of any collected, was 

 not uncommon in Middle Park and North Park (Barber), where great 

 numbers of dead shells would be found in isolated spots ; only a few live 

 ones being found in wet places in the vicinity. In the Blue Eiver Valley, 

 we crossed a belt a hundred yards or so wide, and apparently miles in 

 length, where the surface was thickly strewn with bleached shells, as 

 though an army of these moUusks had been overtaken on the march by 

 universal destruction. 



