2 ART. 7. — I. uniA : IIEXACTINELLIDA, IV. 



liexactins; without pentactins as hypogastralia. The 

 hexasters are variouR but mainly oxyhexasters and dis- 

 cohexasters, tliese sjenerally occuring together; but 

 sometimes one kind occurs to the exclusion of the other. 

 Oxyhexasters are often hemihexactinose and hexactinose. 

 Diseohexasters may be modified into discoctasters. 



In the alwve, I have slisrhtlv modified the dia2:nosis of the 

 same family as given in my Contrib, III., p. 114. 



In '97 F. E. Schulze distinguished three subfamilies under 

 the Rossellida?, viz., the Eossellinte, the Lanuginellinœ and the 

 Acanthascinœ. To these I added in 'g8 a fourth under the 

 name Leucopsacinae ; but since I have later (Contrib. III.) given 

 to this group the status of a distinct family, there remain F. E. 

 Schulze's three suliflimilies al)ove-meiitioned to make up the 

 Rossellid^e. As was pointed out by that writer, they may be 

 distinguished from one another by the absence or j^i'esence of 

 strobiloplumicomes or of discoctasters, thus : 



". — Without discoctiister. 



rt'.— With strobilophimirome... A, Lanuginellinœ. 



h'. — Without jstrobilophimieoine B. RusmlUnœ. 



h. — Witli (liseootastor ; no stroliilophimioomo C. Aeanthascinœ. 



A. LANUGINELLIN.^. 



Pentactinic hypodermalia always present. Gast- 

 ralia, hexactins. Parenchymalia consist of diactins 

 and of large or medium-sized hexactins. Strobilo- 

 plumieome always present among the hexasters, which 



