The Nautilus. 



Vol. XXVI. NOVEMBER, 1912. No. 7 



NOTES ON MAINE M0LLU8CA. 



BY REV. HENRY AV. AVINKLEY. 



For the purpose of making a more careful examination of the 

 warm-water colonies in Maine, the writer spent two weeks at Wis- 

 casset and the same time at Orr's Island in Casco Bay. General 

 collecting at Wiscasset revealed the same species that I found on 

 former visits. A careful search in sheltered places revealed several 

 colonies of Odostomia trifida and bisuturalis, especially large and 

 abundant at Edgecomb. A drive of five miles and work in a 

 drenching rain at Sheepscote Bridge gave one or two specimens of 

 Odostomia bistituralis var. ovi/ensis, Modiolus de7nissvs var. plicatu/us 

 and Ostrea virginiana. Unfortunately the refuse from a saw -mill 

 has nearly exterminated life at the type locality for ovilensis. Ten 

 miles east of Wiscasset, at Newcastle and Damariscatta, 1 had only 

 one low tide, but I found Modiolus demissus var. plicatubis, Grepidula 

 convexa, llyanassn obsoleta, Haminea solitaria, Urosalpinx cinereus, 

 Astyris lunata and P. (^Syrnola) fusca, the last two new to Maine, I 

 believe. Odostomias have been found here by Mr. Wentwortli, but 

 I didn't have time to visit the locality where he found them. 



At Orr's Island I found two more colonies of Astyris lunata, a 

 few Odostomia bisuturalis ; other forms of interest were Cingula acu- 

 leus, Skeuea planorbis of a light color, Retusa pertemiis and gouldii, 

 Bela bicarinata var. violacea (one specimen at low tide) and Mysella 

 plantdata, with of course the more common forms. I found only one 

 land shell, Zonitoides arborea. 



