ZOOLOGY. 431 



glia are the flattening out of the "central cords" of the ad- 

 jacent polyps on opposite sides of the partition. He regards 

 them as quite individual, and finds that they have to do with 

 the formation of colorless blood corpuscles, like the spleen in 

 Vertebrata. 



A new locality for Covdylophora lacustris (Allman) is noted 

 by S. F. Clark in the American Naturalist. This is an inter- 

 esting fresh-water hydroid, allied to the marine Clava, and it 

 is the first time that the species has been found in this coun- 

 try. This hydroid is interesting as being the only compound 

 hydroid ever found in fresh water, and from the fact that it 

 lias a ramified spadix, and that the reproductive zooids are 

 developed in a chitinous cap, while the nutritive zooids are 

 not so developed or protected. A variety of this, described 

 by Professor Leidy, was found by him in 1870 at Newport, 

 while the specimens noticed by Mr. Clark occurred attached 

 to a Potamogeton and a Nitella, as well as to the rocks in the 

 creek. 



Professor E. S. Morse's studies on the Brachiopod Lingula, 

 made in Japan, have brought out some points of much in- 

 terest, new to science. The discovery of auditory capsules 

 in the class of Brachiopods is one of the most important. 

 These organs he determined in a species of Lingula, and 

 their position and general appearance recall the auditory 

 capsules as figured by Claparede in certain tubiculous Anne- 

 lids. He has also cleared up many of the obscure points in 

 regard to the circulation, and is prepared to maintain the 

 absence of anything like a pulsatory organ, the circulation 

 being entirely due to ciliary action. Mr. Morse also de- 

 scribed some of the habits of Lingula. While partially bur- 

 ied in the sand, the anterior border of the pallial membranes 

 contract in such a way as to leave three large oval openings 

 one in the centre, and one on each side. The bristles, which 

 are quite long in this region of the animal, arrange themselves 

 in such a way as to continue these openings into funnels, and 

 entangle the mucus which escapes from the animal. These 

 funnels have firm walls. A continual current is seen passing 

 down the side funnels, and escaping by the central ones. 

 They bury themselves very quickly in the sand, and the pe- 

 duncle agglutinates a sand-tube. They attach themselves by 

 means of this tube to the bottom of dishes in which they are 



