232 THE AMERICAN MONTHLY [Aug. 



lidification of some part of their tissue. Seaward has 

 classed them under Thallophyta as : 1. Peridiniales : 2. 

 Cocospheres and Rhabdospheres; 3. Schizophyta (Chizo- 

 phyceas and Schizomycetes, the bacteria). They are small 

 single-celled plants extremely low as to organization, re- 

 producing by simple cell-division or by spores. In cases 

 they contain chlorophyll and a blue-green coloring mat- 

 ter, hence called Blue-Green Algss, Cyanophycese or 

 SchizophycesB. Those free from color are called Schizo- 

 mycetes. Being exceedingly fragile, they break up into 

 an unrecognizable mass with slightest pressure. It is 

 necessary to release them from the shells of their hosts by 

 a slow process of decalcification. The descriptions of 12 

 figured species are as follows ; figures 1-9 being in the 

 frontispiece and figures 10-12 on page 237. The follow- 

 ing data have been reported by W. H. Harris to the 

 Quekett Club : 



Lacuna flstulos a. — A small irregular-shaped species, oc- 

 cupying the superficial layers of the fragment ; the por- 

 tion of cavity nearer the surface is beset with numerous 

 short, stout, tubular processes, which reach the surface of 

 the containing fragment; sometimes tolerably large por- 

 tions of shell are eroded, exposing the under side of the 

 organism. They occur as isolated individuals, and are 

 rare. Cebu, Phillippine Islands, 20 fathoms, and Auck- 

 land, N. Z., littoral deposit. Fig. 1 x 280. 



Lacuna pubescens. — This is a robust flask-like form, 

 thickly beset with moderately long appendages, which 

 give the organism a hairy or fleecy appearance. There 

 are at times one or two rather long filamentous processes 

 given off from the bulbous portion. Undoubtedly it is a 

 rather rare form. Java Sea and Macassar Straits, both 

 45 fathoms. Probably the majority of forms known as 

 Lacunce are merely a phase or condition in the life his- 

 tory of the plants, or possibly the inital stage of a fila- 

 mentous species. Fig. 2 x 210. 



