THE NAUTILUS. 15 



Anatomy of the Lampsilis type, and agreeing almost com- 

 pletely with that of L. luteola- (see: Ann. Cam. Mus., 8, 1912, 

 p. 348). The mantle flap is of the same shape as in this 

 species, with the edge irregularly toothed, the largest teeth 

 standing on the free, anteriorly projecting lobe, giving it a 

 lacerated appearance. Also the color markings are the same 

 (streak of black or brown pigment, and I think I can distin- 

 guish in some of my specimens an indistinct eye-spot). 



Glochidia suboval, agreeing in shape and size with those of 

 L. luteola; their L. is 0.23, their H. 0.28 mm. Surber has fig- 

 ured them [Rep. U. S. Comm. Fish, for 1914, App. 1915 (Fish. 

 Doc. 110. 313), pi. 1, f. 14]. His measurements are: 0.230 X 

 0.290, while TJtterback (for var. brittsi, Am. Midi. Nat., 4, 

 1916, p. 173 gives : 0.250 X 0.305. 



According to its anatomy, this species falls in the luteola 

 group of Lampsilis, and represents a peculiar type of it, which 

 seems to be restricted to the Ozark region, and may be re- 

 garded as having the same relation to L. luteola as has L. 

 fasciola (= multiradiata) to L. ventricosa. (Smaller, thin- 

 shelled form, with numerous fine, broken rays ; the shell is, in 

 the average, less elongated than that of luteola}. 



I do not understand why Utterback (1. c.) places this species 

 in the genus Eurynia, since he describes very well the flap of 

 the mantle margin. 



NEW LANDSHELLS FROM THE PHILIPPINES. 1 



BY PAUL BARTSCH. 



HEMIPLECTA SAGITTIFEBA BATANENSIS, new subspecies. 



Mr. Walter F. Webb, of Rochester, N. Y., has sent to the 

 U. S. National Museum two Hemiplectas from the island of 

 Batan, off northern Luzon, which belong to the sagittifera 

 complex. This is a dark-colored race, which agrees fairly well 

 in size with typical sagittifera from the Sinait region of Luzon, 

 the type locality of Hemiplecta sagittiffera, but is considerably 



i Published by permission of the Secretary of the Smithsonian 

 Institution. 



