170 BRITISH SPONGIAD^. 



bourhood of Eoundstone, Connemara, in a small pool 

 not far from Lough Cregduff, the locality of that highly 

 interesting plant Naias flexilis (Rostk.) (N.). 



" In August, 1876, I received from my friend Dr. 

 Battersby some specimens of Spongilla lacustris from 

 Caragh Lake, which are remarkable on account of 

 the extreme variety of form that they exhibit. One 

 specimen was three inches in height, composed of 

 seven slender branches of various length, none of them 

 exceeding two lines in diameter. There were no indi- 

 cations of ovaria, but in all anatomical details they 

 perfectly accorded with the structures of more fully 

 developed specimens. The difference in their general 

 aspect is so great as compared with specimens from 

 the Thames and other well-known localities that a 

 hasty observer might readily be led to believe them 

 to be a new species." 



SuBOKDEE IV, r, 200 ; ii, 10. 



Genus 25. — Desmacidon, Bow., i, 200 ; ii, 10. 



1. Desmacidon eeuticosus {Montagu), n, 345 ; iii, 

 PI. LXI. 



Habitat. — Fine masses dredged in Fermain Bay, 

 Cruernsey, in 1865 (N.). 



2. Dbsmaoidon Jefpeetsii, Bow., ii, 304, 347 ; iii, 157, 

 PI. LXII. 



1866 Isodictya rohusia, ii, 304. 



1866 Desmacidon Jeffreyaii, ii, 347 ; ill, 157, p], Ixii. 



