B)\M.E. Wadsicorth — Syenite and Gahhro in Massachusetts. 207 



nation of tlie aperture apparently round and even, but this portion 

 has been cut out of the matrix. 



Relations and Distribution. — Induced probably by the character of 

 the aperture in Phillips' figure, Mr. Leckenby referred this species 

 to " Act(eon glaher," erroneously as I cannot help thinking. No doubt 

 the cylindro-conical outline of the shell, the tabulation of the body- 

 whorl, and the flatness of its sides, are strong points of resemblance ; 

 but the proportions are different, to say nothing of other features, 

 which a bad state of preservation, especially with regard to the 

 termination of the aperture, renders somewhat difficult to describe. 



Three specimens are known to me from the Scarborough Lime- 

 stone, and there is a very stout variety, apparently belonging to this 

 species, in Mr. Leckenby's Cornbrash collection. The rectangular 

 outline of the whorls and stumpy spire serve to separate it from 

 Act. Scarburgensis. 



EXPLANATION OF PLATE V. 



Figs. 1, la. Actcconina hmneralis, Phillips. Dogger, Peak. York Museum 

 (shell partially preserved). Back and front, x 2. 



,, 2. Actmonina sp. Dogger, Peak. Bean Collection, British Museum. 



Back. X 2. 



,, 3. ActcBonina humeralis, Phil. Dogger, Peak. York Museum (speci- 



men showing the striae). Back, x 2. 



,, 4. ActfBon Sedyvici, V^nRv^s. Dogger, Peak. Bean Collection, British 



Museum. Back, x 2. 



,, 5. Actieon pullus,'M.ovx]s B.n& Jjjceii {\ax. oi Ac. Sedqvici). Millepore 



Rock of the coast. Bean Collection, British Museum. Front, x 2. 



„ 6 and 6«. Actceonina glabra, Phillips. Millepore Rock of the coast. Bean 

 Collection, British Museum. Back and front, x 2. 



„ 7. Actaonina iumidula, Morris and Lycett. Scarborough Limestone, 



White Nab. Bean Collection, British Museum. Type kefigured. 

 Front. X 2. 



,, 8, Sff. Acffeonitia cineren, sp. n. Scarborough Limestone, Cloughton 

 Wyke. Leckenby Collection. Back and front. Nat. size. 



„ 9, 9a. Actmoiiina Scarbur-gensis. Lycett (var. approaching Act. giganiea. 

 Deal.). Cornbrash, Scarborough. My Collection. Back and 

 front. Nat. size. 



„ 10, 10«. Bulla undulata. Bean. Cornbrash, Scarborough. Leckenby Col- 

 lection. Back and front. Nat. size. 



,, 11, 11a. " Trochiis''^ jugosus, Bean MS. Dogger, Peak. Bean Collection, 

 British Museum. Nat. size, and portion enlarged. 

 {To be concluded in our next Number.) 



III. — On the Presence of Syenite and Gabbko in Essex County, 

 Massachusetts. 

 By Dr. M. E. "Wadsworth. 



Syenite. — Much of the eastern coast of Essex County, Massachusetts, 

 extending from Salem to a point beyond West Manchester, has been 

 found by the writer to be occupied by a typical syenite of a reddish 

 and greyish colour, which in its macroscopic characters appears to be 

 identical with that from Planen'schen Grund, Saxony, The syenite 

 la places contains much biotite, and also, near West Manchester, 

 quartz grains (segregations?). This syenite is often cut by dykes 

 of a fine-grained greyish syenite, which holds the same relation to 

 the syenite proper as the micro-granite dykes do to the granite of the 



