380 PROCEEDINGS OF THE ACADEMY OF [NoV., 



The specimens of a colony are usually rather uniform. The finest 

 seen are from Lahaina, length 21, height 9 mm. In Honaunau Bay, 

 Hawaii, all seen are small, about length 10, altitude 4.5 mm., and 

 they are very black (var. lirata Rve.). Further up the coast the 

 shells are larger, often with some ribs emphasized. At Moomomi, 

 Molokai, the cavity is some shade of chestnut, border wide, whitish 

 with many brown rays. Similar shells occur at Honokowai, Maui, 

 Diamond Head, etc. These shells agree best with var. amara. 



On the north shore of Kahoolawe I found some very flat shells 

 with 4 or 5 posterior ribs very emphatic (fig. 15). This may be 

 called S. normalis form chirura. Length 10.5, alt. 2.5 mm. 



All of these forms have the same dark, oblong, Nacella-like em- 

 bryonic shell, with posterior apex, and all seem to fade into one 

 another in color and sculpture, in the series of some hundreds ex- 

 amined. 



Fig. 15. — Siphonaria normalis form chirura. 

 Stomatella concinna inconcinna n. subsp. 



Similar to *S. concinna in shape, but dull, greenish white, with some 

 opaque white flames and sometimes a few small brownish dots on 

 the base; these markings confined to the spiral cords. Spiral cords 

 more or less distinctly alternating in size. 



Greatest dimension 3.5 mm. 



Honolulu, on the reef, Pilsbry, 1913. 3 specimens. 



Heteroglypta kanaka n. sp. Fig. 16. 



The shell is oblong, compressed, white, faintly freckled with tawny. 

 The small beaks are central. Anterior part tapering, rounded at 

 the end. Posterior part wider, obliquely truncate. Sculpture of 

 rounded ribs posteriorly, divaricating from a line from the beaks 

 to the lower posterior angle, curved and running to the posterior 

 end behind, straight and running to the basal margin in front of 

 the hne of divarication. The rest of the surface has narrow impressed 

 lines running obliquely backward and downward except close to the 

 anterior end, where there is some very weak obhque corrugation, 



