ZOOLOGY. 741 
We received early in March of this year several specimens of 
Macrobiotus from Rev. W. R. Cross of New Gloucester, Maine, 
collected last autumn in water in which moss was growing. Itis 
white, 73 inch long, and has minute eyes composed of about ten 
irregular facets. There is a distinct under and upper lip to the 
mouth, and a pair of tubercles (palpi?). It apparently differs from 
Macrobiotus Oberhauseri Doyére (Annales des Sciences Naturelles, 
Ser. 2., Tom. 13., 1840), to which it is closely allied in form, by 
Fig. 181. 
Macrobiotus Americanus, 
the claws being shorter and much more curved. It may be called 
Macrobiotus Americanus (Fig. 181 a, eyes; b, mouth; c, claws). 
We have also received drawings of another species of the same 
genus from Prof. C. E. Bessey, of Ames, Iowa. He writes us, 
May 6th, that it was “found in water containing fresh-water 
alge, such as diatoms, desmids, ete.” It is a longer, slenderer 
Species than M. Americanus, and with apparently longer and 
straighter claws.— A. S. PACKARD, Jr. 
Discovery or THE Basar Jornr or Lees or TRILOBITES.—I 
have secured the fine collection of Trenton fossils of Mr. E. D. 
Walcott of Brenton Falls. It is particularly rich in Trilobites. 
Among the most interesting specimens, Mr. W. called my atten- 
tion to one which he was confident would settle the question of 
the presence or absence of legs in Trilobites. And truly there 
can be no doubt left upon this point. The basal articulation of 
