THE NAUTILUS. 87 



inner waters, i. e., at Danvers, seemed to be favorable for a colony 

 of the forms which are common south of Cape Cod, but local and in 

 sheltered places north of that cape. Only a partial examination has 

 been made, but results are interesting. One mud flat of small area, 

 and uncovered at low tide, was swarming with life. Literally I ob- 

 tained quarts of Gemma gemma. "With these were other species more 

 or less abundant. Columhella, Ilyanassa, Poliniees and such forms are 

 expected and were found as usual. Odostomia revealed trifida, bisu- 

 turalis, winkleyi and a new species described below. I was able to 

 secure here a living specimen of the disputed fusca, and observe the 

 animal. Unlike some of this group, that are said to be timid in 

 captivity, fusca was very active. Bulletin 37 of the U. S. Natl. 

 Mus., plate xxvi, figs. 1 and 2, are labeled animal of Turhonilla 

 interrupta. Slight changes would make the drawing for fusca. The 

 plate gives the front of the foot in four lobes; for fusca it should be 

 a continuous curve. From the plate one would infer that the men- 

 tum was of two flaps, one overlapping the other. In fusca this would 

 not be correct, but a deep groove runs along the median line. The 

 front of the mentum is a double curve, and its end is held close to 

 the surface ahead of the foot in crawling, as if it was feeling the way. 

 Eye spots are easily seen at the bases of the tentacles. The animal 

 is semi-transparent, with parts a deep maroon. The tentacles are 

 slender and held close to the mentum. 



The above-named species were found at the headwaters, but no 

 evidence of Turhonilla, as I had hoped. Rowing down river I smelt 

 them, and came back for my dredge. A dozen specimens of T. 

 winkleyi were found, good size, but badly eroded. In other parts of 

 the Danvers River Venus mercenaria, Astarte nunda and some other 

 forms occur, but I postpone exact lists until more work can be done. 

 One unusual find was a solitary specimen of Bela bicarinata var. 

 violacea on a mud flat between tides. 



Later work was done at Salem. The inner harbor revealed the 

 last-named species, with beautiful violet coloring, especially when wet. 

 Salem harbor is practically all mud bottom. Poliniees, Nucula, 

 Toldia, Crenella, Periploma, Lyonsia, Tellina, Nassa, Bela, Retusa, 

 etc., are obtained at moderate depths. Shore collecting revealed the 

 usual species, with some things worth noting. Acmcea testudinalis is 

 very small and nlveus scarce. At one small cove at low tide, with 

 eel grass, I found another colony of Turbonilla winkleyi. 



