LAND SHELLS OP GENUS OBBA FROM MINDORO 361 



of it on Plate 73 A, Figure 3. He cites here Philippine Islands as its 

 home. 



These figures represent the giant form. A facsimile specimen is 

 represented in our Lea collection as U.S.N.M. No. 105990. I am 

 copying Ferussac's figures (pi. 92, fig. 1) and giving also similar 

 photographs of our shell (pi. 92, fig. 5), which, unfortunately, is also 

 without definite locality. The shell figured on Plate 9 and described 

 by Swainson in his "Zoological Illustrations" in 1820 as Helix 

 auriculata appears to belong to the typical race and was most likely 

 received from the same source from which Lamarck obtained his speci- 

 men. Swainson states that he received it from Ch. Dubois, Esq. 



I am unable to say anything about the position of Helix papilio- 

 nacea Valenciennes, as I have not access to the work in which it is 

 published, but follow Pfeiffer in placing it here. 



Mindoro presents an interesting field for the study of zoogeographic 

 races of Obba. In the case of the present species we have no less than 

 six races represented in the material before us. One of these is from 

 the central north coast, Obba planulata varaderoana; the second, 0. p. 

 paluana, from the Paluan Bay region. This seems to extend across 

 the northwestern peninsula to Abra de Hog, at least so a poorly pre- 

 served specimen in our collection from that locality would indicate. 

 The third, 0. p. bongabona, comes from Bongabon on the east coast. 

 The fourth, 0. p. mansalayana, comes from the Mansalay Bay region. 

 The fifth, 0. p. mangarina, comes from the southern end at Mangarin, 

 and the sixth, 0. p. cagurayana, comes from near-by Caguray. 



In addition to these races on the island of Mindoro proper, we have 

 material also from some of the small islands adjacent to Mindoro. 

 One, 0. p. medioensis, I collected on Medio Island, a small isle in 

 Galera Bay off northeastern Mindoro. Another race, 0. p. verdensis, 

 comes from Verde Island north off Varadero Bay, Mindoro. A third, 

 0. p. salcedoi, comes from Ilin Island off southern Mindoro, and a 

 fourth, 0. p. lubangensis, I collected on Glinting Mountain near Looc, 

 Lubang Island. 



KEY TO THE SUBSPECIES OF OBBA PLANULATA IN THE MINDORO PROVINCE 



Last whorl malleated. 



Malleations on upper surface extending to the peristome. 



Malleation exceedingly rough lubangensis. 



Malleation not exceedingly rough. 



Greater diameter more than 30 mm varaderoa,na. 



Greater diameter less than 28 mm salcedoi. 



Malleations on upper surface not extending to the peristome. 



Periphery of last whorl acutely angulated bongabona. 



Periphery of last whorl not acutely angulated paluana. 



