SCRUPARIA. 21 



shorter and more numerous than in the other, which is 

 very flaccid, pale, and with the terminal branches much 

 attenuated/' 



G. IVtllisii, Dawson, from the coasts of Nova Scotia, 

 which is said to differ from G. loricata " in its narrower 

 and less-inflated cells and longer apertures, and in its 

 more dense habit of growth," seems to me to present 

 only the characters of a variety. 



This species has suffered many things at the hands of 

 systematists ; and the formidable list of synonyms given 

 above affords a striking illustration of the injury done to 

 zoological science by the unnecessary creation of names. 



Genus SCRUPARIA, Hincks. 



SCKUPARU (part.), Hinks, Quart. Journ. Micr. Sc. v. (1857). 



GENERIC CHARACTER. ZOARIUM erect, branches given 

 off from the back of a cell, and facing in the opposite di- 

 rection. ZOCECIA subcalcareous , rising one from the other, 

 so as to form a single series, or placed back to back. Aper- 

 ture small, unarmed, slightly oblique, terminal. OVICELLI- 

 GEROUS CELLS small and imperfectly developed, placed back 

 to back with the ordinary cells. OCECIA terminal. No 



AV1CULARIA Or VIBRACULA. 



THIS genus is founded for Scruparia clavata, mihi. Fur- 

 ther examination has convinced me that its peculiarities 

 are such as to separate it from the well-known Eucratea 

 chelata, with which I had previously associated it. 



I have adopted for the present genus Oken's name Scru- 

 paria, which would otherwise lapse altogether. No prac- 

 tical inconvenience, I believe, is likely to result from its 

 retention with a new definition. 



In 1858 Dystcr established the genus HiLvleya for a 



