MUSEUM OF COMPARATIVE ZOOLOGY. 35 



Patula striatella, ANTHONY. 



This species, including Cronkhitei, has also been round in Wyoming and at 

 Ogden Canon, Utah : Nevada : Colorado. (Hemphill.) 



Patula Horni, GABB. 



Also Logan, Arizona. 



Microphysa Ingersolli, BLAND. 



Plate III. Fig. 5. 



A better figure than that in Vol. V. is here given. 



Also found by Mr. Hemphill at Weston, Umatilla Co., Oregon : .Mount Xeho, 

 Wasatch Mountains, Logan Canon, Utah. Also found by Mr. Ernest Ingersoll 

 near Lawrence, Kansas, on the banks of the Kaw. 



Microphysa pygmsea, DRAP. 



Admitted as a universally distributed species (see p. 24), though not actually 

 as yet received from the Central Province. Sharing the peculiarity of jaw 

 with all our species of Microphysa, I have placed it in that genus. 



Microphysa conspecta, BLAND. 



Plate III. Figs. 4, 6. 



Living specimens received from Dr. J. G. Cooper have enabled me to ascer- 

 tain that this species has the jaw characteristic of Microphysa. My figure-, 

 drawn by camera lucida, gives the sixteen plates as they became actually dis- 

 arranged under pressure, showing them to be separated and not forming > me solid 

 piece as in most of the genera. The central plates are not imbricated, and ap- 

 pear lightly connected. The other plates appear to overlap laterally on tbeir 

 outer sides. The jaw is low, wide, slightly arched, the ends scarcely attenu- 

 ated, blunt. 



There are 12-T-12 teeth on the lingual membrane. Centrals with long and 

 narrow base of attachment: reflection small, with three cusps, the middle one 

 much the largest, all bearing short cutting points. Laterals same, but bicuspid. 

 Marginals lo\v, wide, with two broad cusps, each bearing a broad, bifid cutting 

 point. The centrals and laterals are quite like those of I'HJIK. 



A species of the Pacific Province ,il-o. 



Helicodiscus lineatus, SAT. 



A universally distributed species, found over the Central Province, as stated 

 in Vol. V. Specimens collected at Oakland, California, and in Idaho by' Mr. 

 Hemphill, quite, want the revolving lines. 



