LIMAX. 153 



gonital bladder is oval, wilh a very short duct entering the vagina above the 

 penis sac. The arrangement is very nearly that of L. campestris. 



This species is referred to by me as L. Iin/ersolli in Proc. Ac. Nat. Sc. 

 rhihi. 1875, and in Ann. Lye. of N. H. of N. Y., X. 1G9. 



Umax castaneits is a variety of this species. 



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

 only 34 — 1 — 34 teeth, with 12 perfect laterals (PI. I. Fig. K). This important 

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

 species. Genitalia not examined. Blue River Valley, Colorado. 



It is described thus by Ingersoll : Small and slender ; length less than one 

 inch ; color, a lively brown, with a darker spot over the shield ; head, tenta- 

 cles, and eye-stalks black. Bottom of foot white. 



Spurious Species of Limax, etc. 



Limax marmondvs, DeKay. See Tehennophorus Caroliniensis. 



Limax Columhianus, Gould and Tp.yon, I have referred to Ariolimax. 



Limax fuliginosiis, Gould, and 



Limax olivaccus, Gould, are erroneously referred to America by Grateloup (Distr. 

 Geog. Lim. p. 30). 



Limax Weinlandi (see p. 150). 



Limax linmtus, DeKay (see Terr. Moll., II. 33), is mentioned by name only, 

 without description. 



To Vol. I. p. 48 ct seqq. and Vol. IV. p. 32, I refer for information regarding the 

 following species of Kafinesque. Some of them are mentioned by Ferussac, 

 Gray, Grateloup, etc., but no additional information is given by them : — 



Lrmax gracilis {Dcroceras). See also DeKay, N. Y. Moll., 22 ; Gray and 

 Pfeiffer, Brit. Mus. Cat. 



Eumelus Hvidns. 



EumeliLS nebulosiis. 



Rafinesque also mentions — by name only, though not from America, no lo- 

 cality being given — Zilotea, Urcinella, and Tcstacina (Analyse de la Nature ; 

 see BiNNEY and Tryon's edition of Rafinesque, 17). 



C. HOLOGNATHA HELICEA. 



Jaw in one piece ; marginal teeth quadrate. 



In grouping the genera of this section, I have placed (1) those whose jaw is 

 ribless; (2) those whose jaw has decided ribs; (3) those whose jaw has deli- 

 cate, distant ribs, giving the appearance of dividing the jaw into plates, the ribs 

 usually running obliqu"'\' towards the centre of the jaw. These divisions are, 

 however, adopted only provisionally. Even now they seem to be in many 

 cases unreliable. I am led to believe that these modifications will eventually 

 be proved of not even generic value. See my remarks on the jaw of DenteU 

 laria. 



(1) Jaw without decided ribs on its anterior surface. 



