Dentition of Pulmonata. 22 



Limax Hewstoni, I. G. Cooper. 

 The specimens examined are from the state collection of 

 California, presented by Dr. J. G. Cooper. 



These specimens are not in good condition for anatomical examination, 

 but I am able to state that both testicle and ovary are large. The ovi- 

 duct is long and gi-eatly convoluted. The prostate is well developed. 

 The vagina is very short, the very short duct of the genital bladder enters 

 at about its middle. The last named organ is large, globular. The penis 

 is small, short, cylindrical, expanded and bulbous at its apex, where the 

 vas deferens enters. I could detect no accessory organs in the single 

 specimen imperfectly examined. 



The genitalia are somewhat of the same type as those of L. flavus (see 

 Terr. Moll. U. S., I), Linn., but the dentition of the latter is quite dis- 

 tinct (see above). There is a still stronger resemblance to the genitalia 

 of Amalia gagates as figured by Semper (Phil. Archip., pi. xi, fig. 9), so 

 far as the penis and genital bladder are concerned. 



The species certainly belongs to the section Amalia, as 

 understood by Semper (]. c. p. 84) and Heynemann (Mai. 

 Blatt., X, 200) as shown by the dentition of the lingual 

 membrane. I have already, in connection with Mr. Bland 

 (Ann. N. Y. Lye. N. H., X, 349), described the dentition. 

 It is necessary, however, to be more explicit in the descrip- 

 tion, as several types are found in the genus Limax (in the 

 broad sense usually adopted). 



Dr. Cooper's tj'pe now before me has the lingual membrane long and 

 narrow. Thei-e ar6 about 50-1-50 teeth. The centrals are tricuspid, the 

 middle cusp is stout and reaches to the lower edge of the base of attach- 

 ment, the side cusps are not well developed ; all three cusps bear a cutting 

 point. The base of attachment is almost as broad as high. The lateral 

 teeth, about 22 or 25 in number, are of the same type as the ceuti-als, 

 equally tricuspid, and so symmetrical as to be with great difficulty distin- 

 guished'frora the central tooih, excepting the outer ones, which lose the 

 inner cusp. The marginal teeth are aculeate, not bifid, and are generally 

 short and stout, but in some specimens are long and slender. 



So far as outward appearance goes, the species somewhat 

 resembles Amalia marginata, Drap., as figured by Lehmann 

 (Lebenden Schnecken, etc., 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 



