22 MARINE INYERTEBRATA OF GRAND MANAN. 



cuspidata, F. et H. (TJi. brevirosiris, Brown), more than any other European species. 

 It was taken in 40 f., on a muddy bottom, off Long Island. 



PANOP^EA NORVEGICA, Loven. Taken (dead) in forty f., on the Hake Ground. 

 This is the first instance of its occurrence on the N. E. coast. 



MYA TRUNCATA, Linn. Found in considerable numbers under stones near low- 

 water mark, at Duck Island. 



M. ARENARIA, L. Common in the coves. 



SAXICAVA RUGOSA, Lam. Large and common at low water, but small when 

 found in deep water. 



S. ARCTICA, Desh. Occurs occasionally in deep water. 



PHOLAS CRISPATA, L. Occurs very rarely. 



GASTEROPODA. 



PROSOBRANCHIATA. 



DENTALIUM STRIOLATUM, St. Very common on muddy bottoms in the coralline 

 zone. 



CHITON ALBUS, L. Found among nullipores in 4 f., and occasionally at low water. 

 Those taken in the coralline zone are nearly blaqk. 



C. RUBER, Linn. 



C. MARMOREUS, 0. Fabr. These two species are excessively abundant just 

 below low-water mark, on rocky bottoms, especially on the various species of 

 Nullipora. To take a hundred or more in one dredgeful from this ground is by no 

 means uncommon. They are easily distinguished from each other by their mar- 

 gins, that of C. marmoreus being smooth and leathery, while that of C. ruler is 

 granulated. The marmoreus also grows much larger than the ruler ; specimens of 

 the former are commonly more than an inch in length. 



C. MENDICARIUS, Migh. A few fine specimens of this rare species were dredged 

 (alive) in 35 f., in the Hake Bay. Besides Dr. Mighels's specimen, they are the 

 only ones now known. 



PILIDIUM C^CUM. Patella <xeca, Mull. P. Candida, Couth. Pilidium candidum, 

 St., N. E. Test. Moll. I have been able to identify our species with the European 

 by specimens sent me by Sars. It is not unfrequent at Grand Manan, in the coral- 

 line zone. 



TECTURA TESTUDINALIS, Gray. Common in the third and fourth subregions of 

 the littoral zone, of a very large size. 



CALYPTR^EA STRIATA, Say. Specimens more than an inch in diameter are not 

 uncommon in deep water. I am quite confident that it will jrove a new species, 

 but have no southern examples of the type for comparison. 



DIADORA NOACHINA, Gray. During a low spring tide, in August, I obtained a 



