( 200 ) 



It may be proper to add that Dr. Harvey has not been able to find on 

 the portion of Captain Carmichael's specimen examined the axillary 

 tetraspores, which that observer describes, and from which the drawings, 

 (fee, in Phyc. Brit, are taken. 



OALLITHAMNION SPARSUM. 



EXPLANATION OF DISSECTIONS, &c. 



Fig. 1. — Callithamnion sparsum, natural size, on Laminaria digitata. 

 2. — Filaments. 



3. — Articulations. Both magnified. 

 Phyc. Brit. 



