FISHES AN13 FISHERIES OF THE IRISH SEA. 



cent., and the calcium carbonate from 40 to 80 per cent. In all the neritic deposits there are 

 in the residue small quantities of calcium phosphate, of iron, and of alumina. 



In some of these deposits the calcareous matter is formed almost entirely of 

 Lithothamnion. Amongst the Nullipores from our neritic deposits Professor Harvey Gibson 

 has identified the following species : Lithothamnion polymorphism, L. calcareum, L. agariciforme, 

 L. fascicnlatum, the variety fruticnlosnm, and Lithophyllum lenormandi. 



One of these neritic deposits (A) has its calcareous matter formed by a large number of 

 animals, belonging to various groups, in addition to nullipores. One sample (measuring 

 7 qts. \\ pts., and weighing, when dry, 17 Ibs. 3^ ozs.) which was gone over carefully for the 

 purpose of identifying the constituent particles contains more or less fragmentary remains of at 

 least the following 99 species, all of them forms that leave calcareous remains : 



NULLIPORES : 



Lithothamnion fascicitlafum 

 L. caJcareiim 

 Lithophyllum lenormandi 



ECHINODERMATA : 



Echinus sphcera 



Echinocyamns pusillus 



Echinocardinm cordatum 

 VERMES : 



Serpula, sp. 



Spirorbis, sp. 

 POLYZOA : 



Cellar in Jistulosa 



Cellepora avicnlaris 



C. dichotoma 



C. pumicosa 



Idmonea serpens 



Microporella cilia fa 



M. malusii 



M. violacea 



Schisotheca Jissa 



S. divisa 



Mastigophora hyndmannt 



M, dutertrei 



Mucronella pcacliii 



M. variolosa 



M. ventricosa 



M. cocci nc a 



Do., var. mamillata 



Sch izoporella a u ric u la ta 



S. linearis 



S. unico nil's 



S. simplex 



S. vulgar is 



S. discoidea 



S. ci istata 



Membranipora catcnularia 

 M. solidula 

 M. pilosa 

 M. nodulosa 

 M. discreta 

 M. aurita 

 M. crattcula 

 M. flcmingii 

 Hippothoa d is tans 

 Cribrilina annulata 

 C. punctala 



C. gattya 

 Crisia aciileata 

 sEtca recta 

 Amathia Icndigcra 

 Pore I la cone inn a 

 Do. , var. belli 



P. miniita 

 Cribrilina radiata 

 Phylactella collaris 

 P, labrosum 

 Micropora coriacca 

 ( 'hortsopora brongniartii 

 Diastopora patina 



D. obelia 



D, suborbicularis 

 Stomatopora Johnston i 

 S. incurvata 

 Lepraha foliacca 

 L. pertusa 

 Lagenipora socialis 

 Smittia trispinosa 

 S. reticulata 

 Lichenopora hispida 



