183 



layered, free, maze-like, branching colonies with broad and flat, partly curved 

 and twisted branches. 



Closest to this variety some small colonies must be classed, which form cov- 

 erings on algae from Geograph Bay, W.-Australia (on Vidalis spiralis, Botanical 

 Museum), from Jamaica (on Boihnjolhnmninn Seaforthi, the herbarium of Prof. 

 Lange) and from Wyecombe Bay (on Saryassiim scabripes, Bot. Mus.). In all of 

 these, well-developed acropetal spines are found, but the lip is slightly developed 

 or absent, and in a greater or smaller number of zooecia a division of the cryp- 

 tocyst into several areas, separated by sutures, is found, similar to what is known 

 in Th. Jeri'oisi and Th. mamillaris. In the colony from Geograph Bay the lateral 

 margins of the aperture are almost parallel. 



Var. B. (sparsipunctata). 



(PL VI Ij, figs. 3 a— 3 b). 



Length of zocecia 0,66 — 0,73"""- The aperture, the size of which is a little more 

 than one-third of the entire length of the zooecium, has a broad and deep sinus. 

 The more or less developed adoral areas have no spines, and tlie smooth cryp- 

 toc3^st has generally only a few scattered pores. In most cases, I think, both the 

 ojjesiular outgrowths reach the basal surface. The larger meets the latter in a 

 closed curved line, generally very large, angularly arch-shaped and pointing obli- 

 quely towards the proximal end. The other opesiular outgrowth also touches the 

 basal wall in a closed curved line, which however is very small, and both curved 

 lines have frequently one leg springing from the margin of the distal wall. 



Spicules: Length of curves between 0,026 and 0,079'"'", of compasses be- 

 tween 0,073 and 0,33"""- 



Of this form I have examined some fragments of free, partly hollow, partly 

 solid, vincularian colonies from Port Denison, Queensland (The Museum of Zoo- 

 logy at Cambridge, England). 



Var, C. (prominens). 



(PI. VI b, tigs. 1 a-1 f). 



Length of zooecia 0,53 — 0,66™"^- The aperture, the length of which may be 

 contained 2'/^ — 3 times in the whole length of the zocrcium, is furnished with a 

 broad and deep sinus, and its lateral margins are parallel proxinially. The two 

 adoral areas may sometimes be flat, sometimes furnished with acropetal spines of 

 extremely ditTerent width and length, but generally circular in transverse section. 

 Of the two opesiular outgrowths only one reaches the basal wall, touching it in 

 a rather long, open, generally hook-shaped or angularly bent line. 



