426 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 1 



is shown in figure 48, c. Penis papilla absent; the vasa deferentia 

 enter the anterior end of an elongated tubular chamber, which curves 

 ventrally and after receiving the two oviducts proceeds ventrally 

 and disappears without connecting with the ventral surface. Pre- 

 sumably this ventral extension is the common genital atrium, which 

 would later open through the ventral surface. The whole is sur- 

 rounded by a tissue rich in muscle fibers. This early condition of the 

 copulatory apparatus closely resembles von Graff's figure (1899, p. 

 166) of a similar stage of another Geoplana species, and in fact it ap- 

 j)ears that throughout the Terricola the copulatory apparatus gener- 

 ally passes through such a stage. Hence it is impossible to draw any 

 conclusions as to the structure of the mature apparatus of Geoplana 

 mexwann from the immature specimen. G. m^xkana can be differ- , 

 entiated from other meml)ers of the genus at present only on the. 

 basis of the color pattern. 



Locality. — Mexico. The label reads: On violets from Mexico (in 

 cargo) intercepted at Laredo, Texas, Sept. 10, 1935, by j\I. G. Vinzant." 



Type. — A.S serial sections, U.S.N.M. no. 20405. Paratype, pre- 

 served, U.S.N.M. no. 2040G. 



Remarks. — This species and two (others (one known and one new) 

 from Yucatan recently described by the author (Hyman, 1938) are 

 the first land planarians to be recorded from Mexico. They probably 

 reprevSent but a fraction of tlie terricolous planarians of that country. 



GEOPLANA MONTANA, new species 



Figures 48, d, e; 49, n-d 



Material examined. — Four si)ecimens, one small and immature, ono 

 in bad condition, the two others fully mature and in a satisfactory 

 state. The one with the best-preserved coloration selected as the type, 

 the other as paratype. 



Description.. — Type specimen 50 nun long, width at middle of body 

 5 mm ; paratype larger, 70 mm long, 6.5 mm wide at widest region. 

 Head small, rounded (fig. 48, e), body quickly widening to a broad 

 flat shai)e, which it retains to near the posterior end, there tapering 

 to a point (fig. 48, d). 



Eyes very numerous, a thousand counted on each side of the type 

 specimen, in single file or slightly doubled on the head, quickly 

 increasing to form a broad irregular band several eyes deep toward 

 the middle of the worm, then diminishing in size and mnnber to the 

 posterior end (fig. 48, d). Figure 49, <z, gives the details of the eye 

 arrangement from a region of the body where the eyes are most 

 numerous. The eyes continue around the anterior margin of the 

 head (fig. 48, e) bordering the "Sinneskante," or sensory margin, a 



