210 



this specimen must have been nearly five and a half feet, and 

 the breadth of the shoulders considerably over two feet ; the 

 hands extend a little below the knees ; the abdomen, judging 

 from the iliac fossse, must be nearly two feet wide ; the lower 

 extremities are strongly bowed. 



This is one of the most complete skeletons in this country ; 

 there is an entire one at the Jardin des Plantes, Paris, but of a 

 smaller specimen. A more detailed description, with accurate 

 measurements, will be given in the next number of the Society's 

 Journal. 



On motion of Dr. Cabot, seconded by Dr. Kneeland, it 

 was 



Voted, That the thanks of the Society be presented to 

 the American Board of Commissioners for Foreign Mis- 

 sions for their valuable donation. 



The Secretary presented, in behalf of Mr. Charles Gi- 

 rard, descriptions of two new genera and two new species 

 of Planaria ; also an account of a new species of Spatan- 

 gidse from the Atlantic coast of the United States. 



During the winter of 1849, while studying the fauna of Bos- 

 ton Harbor, I met with several specimens of a minute species 

 of a slug-shaped naked mollusk, which I referred at once in 

 my notes to the natural order of Planaria, but belonging to a 

 genus unknown to me. Anxious to ascertain whether the same 

 generic form had not been seen and described by European 

 naturalists, I abstained from giving it a name until I should have 

 access to a paper of 0th. Fabricius on the Danish Planaria3, 

 published in 1826. Having satisfied myself that the PL li?na- 

 cina of that naturalist is generically allied to the species I had 

 from Boston Harbor, and finding that no generic name has been 

 provided for either, I beg leave to offer it to the Society as a 

 genus, proposing for it the name of 



NiOBE Girard. 



Body limaciform, smooth, convex above, flat below. There 

 is a distinct foot as in the land and sea slugs, separated from 

 the upper part of the body by a marginal groove or furrow. 

 Head proportionally large and separated from the body by a 



