AMASTRA. 31 



under color of nearly the same shade. They have great super- 

 ficial resemblance to A. decorticata, which does not occur in 

 the Waianse range. 



A. DECORTICATA Gulick. 



Vol. XXI, p. 200. The type lot of A. solida Pease (Vol. 

 XXI, p. 178), lent by the Museum of Comparative Zoology, 

 proves to comprise three species. One shell is a short form of 

 A. textilis with an abnormally thickened outer lip, probably 

 senile or pathologic. Two are identical with A. subrostrata 

 Pfr., and have been noticed under that caption; one of them 

 served for Pease's description of the peristome. 



The fourth shell, pi. 7, fig. 1, is an A. decorticata, with 

 exactly the texture and color of many of Gulick 's Kawailoa 

 specimens, but slightly abnormal by having the last two 

 whorls rather tumid just below the suture, as if the spire 

 had been slightly telescoped on the penultimate whorl. 

 Exactly the same appearance is occasionally to be seen in 

 Amastra, Bulimulus and other shells of like shape. The 

 color is rather peculiar, kaiser-brown with tawny streaks, 

 fading to yellow below the suture on the last 2y 2 whorls, and 

 with dull blackish streak behind the outer lip ; the upper half 

 of the spire being liver-brown. The outer lip has been broken 

 and repaired, is dark-edged, and thickened a little distance 

 within. Parietal callus moderately thick but transparent 

 and therefore not conspicuous, exactly as in decorticata. 

 Length 16, diam. 9 mm.; whorls 6%. It is a "dead" but 

 fresh shell. 



Pease's description of the external color and dimensions 

 were from this shell, while his description of the aperture was 

 from one of the specimens of A. subrostrata. A. solida be- 

 comes therefore a synonym of both species. 



From the appearance of the four shells assembled by Pease 

 in his lot of A. solida, we would say that they were from 

 three localities, and were associated by Pease simply because 

 of the thickened peristome. In three of them the thickening 

 is obviously abnormal; the other shell being a normal 

 A. subrostrata. Snails with irregular apertural calluses are 



