of the neighbourhood of Aberdeen. 467 



out " in his genus of the same name. On Sertularia abietina ; a 

 single specimen. 



Cellepora pumicosa. Extremeiy abundant. 



C. ramulosa. It is not difficult to trace the gradation by which this 

 and the preceding pass mutually into each other. Fragments are 

 plentifully cast upon the beach, and fine specimens are occasionally 

 brought up from deep water by the fishing-lines. 



C. Skenei. Deep water ; a single specimen. 



C. Icevis. A specimen now before me agrees well with Dr. Fle- 

 ming's description of the only one met with by him ; it is half an inch 

 in height, and rather more in breadth. But why give as part of the 

 specific character " pores with simple mouths," when a few lines 

 further on we find it stated, that towards the extremities of the 

 branches the orifices are furnished with " a blunt process at the 

 proximal margin" ? Although the majority of these processes are more 

 or less obtuse, yet many are acutely pointed ; and were it not for 

 the deservedly high scientific character of its discoverer, I would not 

 have the slightest hesitation in referring Cellepora lavis to C. ramu- 

 losa, one of the least ambiguous modifications of which I believe it 

 to be. 



Lepralia coccinea* On stones from deep water ; plentiful. 

 L. ciliata. With the preceding; also on shells, and on Cellepora 

 ?*amulosa. 



L. quadridentata, Johnst. MS. ; Hassall, Ann. and Mag. Nat. 

 Hist. vi. p. 171. pi. vi. f. 5. On a dead valve of Cyprina Islandica 

 from deep water. 



L. trispinosa. On a root of Laminaria digitata. 



L. insignis, Hassall, Ann. Nat. Hist. vii. p. 368. pi. ix. f. 5. I have 

 a species of Lepralia which agrees well with Mr. Hassall's descrip- 

 tion (his figure I have not seen) of L. insignis, with this slight ex- 

 ception, probably an accidental one, that the spines surrounding the 

 aperture of the cells vary in number from four to six. The strong 

 process rising out of each cell is very characteristic. On a fragment 

 of limestone from deep water. 



L. reticulata. Crust reticulated ; cells tubulous, narrower towards 

 the base, with a perforation in the upper wall ; aperture slightly con- 

 tracted, and furnished above with a blunt tooth. — J. M C G. 



The crust is very thin, spreading irregularly, and of a snow-white 

 colour. The cells are slightly prominent, tubular, increasing slightly 

 in breadth towards the distal extremity ; in the upper wall of each 

 cell, close to the mouth, is situated a somewhat triangular opening 

 communicating with the interior, and sometimes crossed by a small 

 transverse spiculum. The round, scarcely contracted aperture of 

 each cell is furnished above with a short blunt tooth which projects 

 downwards, being apparently connected with the triangular opening 

 in the upper wall of each cell. This opening varies much in size, 

 but is always present ; it is separated from the mouth by a short 

 interval, which is often broken down and a deep notch formed. Some 

 of the cells are furnished with globular pearly opercula. The interval 

 between the cells is beautifully reticulated, a double row of apertures 



