The Nautilus. 



Vol. XXX. APRIL, 1917. No. 12 



THE STATUS OF THE OENTTS SUBULABIA MONTEBOSATO. 



BY PAUL BARTSCH. 



In 1853, H. & A. Adams published in vol. 1, pp. 237-238 

 of their work on the "Genera of Recent Mollusca " the genus 

 Leiostraca, defining it in the following manner : 



' ' Shell turreted, subulate, flattened, widest from side to side, 

 polished, smooth, semipellucid ; sides with a thin varix ex- 

 tending as far as the apex of the spire ; aperture oblong, en- 

 tire ; inner lip distinct, callous, slightly sinuous in the middle ; 

 outer lip flexuous. 



"Ex. L. bilineata, Alder, pi. 25, fig. 3. Shell, L. Metcalfd, 

 A. Adams, fig. 3, a. 



"The most curious circumstance about the type of this genus 

 is the fact of its being compressed from before backwards, with 

 a varix on each side, as in Bursa and Pythia. 



* ' Species of Leiostraca. 

 acuta, Sow. Mindorensis, Adams and Reeve 



bilineata, Alder solitaria, C. B. Adams. 



bivittata, H. and A. Adams subulata, Donov. 



(bilineata, Adams and Reeve) unilineata, Adams and Reeve 

 Julvocincta, C. B. Adams varians, Sow." 



MetcaJfei, A. Adams 



Since the characters of the genus are based upon the shell, 

 and pi. 25, fig. 3 shows the head of an animal only, while fig. 

 3a, Leiostraca metcalfei A. Ad. shows the shell characters above 

 defined, we may take Leiostraca metcalfei A. Ad. as the type of 

 the genus. Even if we were to admit all the species listed by 



