No. 481] MASSACHUSETTS OSTRACODES 39 



figures and descriptions and seem to be that species without doubt. 

 There is a very considerable range in the measurements given as 

 many young specimens and both sexes wen- in the lot measured. 

 An average measurement would be close to the inaxiuuiin given 

 here, if adults alone were taken. 



This species, hke the others of its genus, has a crawlmg ha]>it 

 and may be in this way overlooked in collecting and in the exami- 

 nation of fresh material. It was not abundant in either of the 

 two collections in which it was found. 



