158 AMERICAN JOURNAL 



I am informed that Dr. W. Newcomb dredged a living speci- 

 men of this species off Santa Barbara Island, California, and 

 that it is now, with the remainder of his fine collection, in the 

 cabinet of Cornell University, New York. 



This species differs from the typical species of LinguUdce, 

 in the diverging lamellse which support the post-parietals, in the 

 form of the anterior adductor scars, and in its color. 



A microscopical examination of the shell gave the following 

 results : 



There were no punctures visible with a good light and a power 

 of 900 diameters. The substance of the shell was shown by a 

 cross section to be composed of translucent horny laminge, nearly 

 parallel with one another and separated by layers of white 

 amorphous calcareous matter which looked much like powdered 

 sugar. There were no tubuli visible after the most careful 

 search; the horny layers presented faint indications of a par- 

 tially fibrous structure, but nothing of the kind extended to the 

 calcareous layers. A section of the lamina much resembled the 

 end of a T-rail, with one flange taken off and obliquely inclined. 

 The anterior part of the shell contained less calcareous matter 

 than that nearer the beaks, and the margin seemed entirely 

 horny. The number of horny layers amounted to eight or ten, 

 in the thickest part of the shell. They were not uniform in 

 thickness, but were thinner than the amorphous calcareous 

 layers. 



The paucity of material prevented a fuller examination, but 

 it is to be hoped that some one will examine typical specimens 

 of Hinds' species and report on their structure. The present 

 species may be distinct and the albida a true Lingula, but this 

 can only be decided by reference to the type. 



If the two are identical, it seems strange that the remarkable 

 internal structure should have remained so long unnoticed. 



This genus appears to take the place in America of the genus 

 Lingida^ which has its home in the Australian and Indo-Pacific 

 Seas. 



Glottidia pyramidata, Stm. 



Lingula pyramidata, Stm., Am. Journ. Sci. and Art, 1860, 

 xxxix, p. 444. 



This second species of Crlottidia is generally of small size and 

 horny texture. There is a very slight deposit of lime in the 

 thickest part of the shell, but the greater portion is nearly or 

 quite destitute of it, and contracts irregularly in drying. The 

 laminae and septum are entirely horny. The shell structure ap- 



