326 DESCRIPTION OF A 



of Prestwick Car, and that further opportunities of studying the 

 form, and especially its sporangia, may never return. 



Amongst other slides of interest, all carefully prepared and 

 mounted, were, 1. Of an Alga, apparently new, which, I am in- 

 formed, is in D. Oliver's ^hands for examination; 2. Of "Red 

 Snow" (Protococcus nivalis), from Crag Lough, remarkably fine; 

 3. A species of Chcetopliora from Prestwick Car; and 4. A 

 section of fossil bone, Avhich I recognised as probably Pterodac- 

 tyle ; the specimen yielding this was found amongst refuse at 

 the mouth of Cramlington Pit, and was taken for petrified wood. 

 I am in hopes that some one may be found competent to do 

 justice to many objects of equal interest, obtained by T. Atthey 

 from the same locality. 



In conclusion, I can only say that the impression left on my 

 mind by the visit is one of unmingled pleasure and gratification. 



EXPLANATION OF PLATE XVI. (in Part). 



Yv^. 7 Podosira comjpressa — 7«, side-view ; 76, front-view of abbreviated fila- 

 ment. 



8 Attheya decora— 8a, 8b, frustules with endochrome ; 8c, front-view; 8d, 



side-view. 



9 Navicida iJseudo-Ubellus — 9rt, side-view; 9 J, front-view. 



10 Chcetoceros boreale — 10a, two valves attached ; 106, termination of cornu. 



11 Closterium acicuJare — 11a, frond with endochrome; lib, empty segment. 



Figs. 7, 10, magnified 500. Fig. 11 magnified 400 diameters. 



XXV. — On an undescribed Crustacean of the Genus Mysis. By 

 the Rev. Alfred Merle Norman, M.A. (PI. XVII.) 



Three members of the genus J/?/s/s were described in "Bell's 

 British Crustacea," and since the publication of that work the 

 number of British species has been doubled. In the year 1853, 

 Mr. Gosse described a new form under the name of Mysis pro- 

 ductus.* In the spring of 1855 I met with two additional spe- 



♦ Annals and Mag. Nat. Hist., wSecond Series, vol. xii., p. 15G, PI. VI., fig. 5. 



