point where the double row of suckers terminates anteriorly, are 

 very much smaller than the other eight, which are elongated, 

 frondose at their extremities, and have calcareous supports in 

 the lower half, which is slightly compressed. 



It inhabits the Grand Bank, and the coast of New England. 



It is in the Cabinets of the Essex County Natural History 

 Society, and of the Boston Society of Natural History. 



No calcareous papillae were observed at the anus. If they 

 should finally prove to be absent, this circumstance, with the 

 occurrence of calcareous grains on the surface, and of the single 

 row of suckers on the ventral side, might warrant the separation 

 of this species from Anaperus. 



Mr. Stimpson also gave a list of fossils found in the Post- 

 Pliocene deposit, in Chelsea, Mass. at Point Shirley, 

 namely : — 



Balanus rugosus, Mya arenaria, Solen eiisis, Mactra solidis- 

 sima, Venus mercenaria, Asiarte sulcata, Astarte castanea, Car- 

 dita borealis, Myiilus edulis^ Modiola modiolus, Ostrea borealis, 

 Fusus decemcostaius, Buccinum plicosum, Buccinum trivitlatum. 



These fossils occur in the upper part of the stratum of 

 blue clay and pebbles, which crops out from under the coarse 

 drift, at the cliffs on both sides of the hill. On the east side the 

 stratum is at an elevation of fifty or sixty feet above high water 

 mark ; on the west side it is but two or three feet above the 

 same level. At some little distance from this site, a stratum of 

 clay, probably the same, containing shells of Mad r a solidissima 

 was met with in digging a well, at the depth of fifty feet lelow 

 high water mark, showing the great irregularities of the ancient 

 sea bottom. 



With regard to the species mentioned in the list I must remark, 

 that those most common in the deposit are inhabitants of deep 

 water, and of northern origin. With the exception of Venus 

 mercenaria, I have obtained all of them in a living state by 

 dredging within a mile of the locality where they are now found 

 fossil. 



The state in which they occur would seem to furnish evidence 

 in favor of Lyell's theory of the drift being deposited from the 



