QUATERNARY FOSSILS. 327 



p. 410. Occurred frequently on Lamellibranch shells 

 in large and thick masses at Caribou Island and Hope- 

 dale. 



Myriozoum subgracile D'Orbigny. {^Millepora trun- 

 cata Fabr., Faun. Groenl.) Fragments of the stems of 

 this graceful species occurred abundantly at both locali- 

 ties. 



Rhynconella psittacea (Gm.). Perfect valves were 

 found at Caribou Island, and others were given me 

 which were reported to have been found three miles from 

 the mouth of the Esquimaux River. Other shells, such 

 as a Cardium and Cardita borealis, also came from the 

 same place, showing that they had been washed out of a 

 drift disposit on the river. This species was abundant 

 at Hopedale, where the valves adhered by their ligament. 



Pecten islandicus Linn. This was not common. Sev- 

 eral ponderous valves, larger than I have seen elsewhere, 

 had the ribs united into groups of two or three, separated 

 by sulci of equal width ; but in young and fragile sub- 

 jects the ribs were equally distributed, and differed in no 

 respect from the living young, or from those of the same 

 age, from the drift clays of Maine and New Brunswick. 



Yoldia myalis Stimps. A specimen of Yoldia ardica, 

 received from Dr. Liitken, approaches Y. myalis more 

 than Y. sapotilla. It is however, longer, and the lunula 

 is not so short and deep as in Y. myalis. One valve. 

 Hopedale. 



Leda minuta Moll. {Area minuta Fabr., Faun. 

 Groenl.) Caribou Island, rare. Common at Hopedale. 



Modiolaria discrepans Moll. One broken valve. 

 Hopedale. 



