lO 



CODLINGE : OBSERVATIONS ON SPECIES OF ARION. 



globose, the upper a short, narrow tube. The lower portion 

 opens into the vestibule as a broad tube, thus differing very 

 markedly from the condition seen in A. empiricovum, Simroth || 

 has figured and described the spermatophore, which also differs 

 from that found in A. empiricorum. 



From the above remarks, I think it will be seen that there 

 is reliable evidence of important and constant internal differences 

 between these four species. 



Nova Acta K.L.-C. Deutsch, Akad. Nat., Bd. Ivi., Taf. 6, Fig. 2. 



EXPLANATION OF PLATE IL 



The terminal ducts of the generative organs of A rion atci\ L. 

 The same of A . rii/iis, L. 



,, A. empiricorum, Y^T. 



,, ,, A. lusit aniens, Mah. 



,, ,, A. -lobrei, Poll. 



LETTERING. 



f.ov. Free-oviduct. 



l.v. Lower vestibule. 



ov. Oviduct. 



pr. Prostate. 



r.d. Receptacular duct. 



r.m. Retractor muscles. 



r.s. Receptaculum semiuis. 



s.d. Sperm-duct. 



n.v. Upper vestibule. 



v.d. Vas deferens. 



