known Species of Spongilla. 103 



Luhomirslcia haicalensis. 



Ltibomirskia batcalensis, Pallas (apud Djbowski, No. 32, p. 11, Taf. i. 

 fig. 1), with four varieties, viz. a, /3, y, 8. 



One learns from the figure of this species {op. cit. Taf. i. 

 fig. 1), which is half the natural size, that it consisted of long 

 digital processes, about 14 inches by -^ an inch in their greatest 

 diameters, more or less uniformly inflated at short intervals 

 (that is, bullate), but solid throughout. Structure elastic, but 

 not crumbling between the fingers. Colour dark grey or olive- 

 green. Skeleton-spicule curved, fusiform, gradually sharp- 

 pointed, spiniferous generally, but especially towards the ends, 

 particularly in the variety y, where the rest of the shaft is 

 smooth (PI. VI. fig. 19). 



Loc. Lake Baikal. 



Largest skeleton-spicule 0*222 by 0*021 millira. " Paren- 

 chyma-spicule " (Pearly form of the foregoing) 0*159 by 

 0"006 millim., a smooth thin acerate (fig. 19, a). 



Lubomirshia hacillifera. 



Lubomirskia hacUlifei-a, n. sp. (No. 32, p. 22, Taf. i. figs. 2, 4, 5, and 6, 

 &c.), with three varieties, viz. a, jS, y. 



Massive, more or less lobed. Structure much the same as 

 that of the foregoing species, but finer and softer. Colour 

 grass-green. Skeleton-spicule curved, cylindrical, sometimes 

 fusiform (as in the variety /S), round at the ends, and spinife- 

 rous generally, but more particularly over the ends, sometimes 

 (as in the varieties) smooth over the rest or middle of the shaft 

 (PL VL fig. 20). 



Loc. Lake Baikal. 



Largest skeleton-spicule 0*270 by 0*024 millim. Paren- 

 chyma-spicule a small, thin, smooth acerate. No measure- 

 ment. 



Lubomirskia intermedia. 



Luhoynirshia intermedia^ n. sp. (No. 32, p. 28, Taf. iv. fig. 3, A, spicule 

 only), with one variety, viz, a. 



Flat, spreading. Structure like that of L. haicalensis^ but 

 more tender. Colour yellowish or olive-green. Skeleton- 

 spicule curved, fusiform, gradually sharp-pointed, spiniferous 

 generally (PI. VI. fig, 21), 



Loc. Lake Baikal. 



Largest skeleton-spicule 0*222 by 0*018 millim. Paren- 

 chyma-spicule a large smooth acerate. No measurement 

 given. 



