;59() THE VOYAGE OF H.M.S, CHALLENGEE. 



The boundaxy between excurrent and incurrent regions is marked by projecting toothed 

 oxydiacts which run to a point or are slightly club-shaped. Zebu, Philippines ; Little 

 Ki Island, 140 fathoms. 



Suborder II. DICTYONINA, Zittel. 



Hexactinellida in which the large parenchymal hexacts are from the first more or less 

 reo-ularly united as dictyonalia in a firmly connected framework. 



Tribe I. UNCINATAEIA, F. E. S. 

 With uncinates. 



Subtribe I. Clavularia, F. E. S. 



Besides the pentact hypodermalia and hypogastralia there are groups of radially- 

 disposed clavulfe. 



Family I. F a R R E i D .■£, F. E. S. 



In the youngest (most external) portions of the tubes the dictyonal framework 

 consists solely of a single-layered network with square meshes, in which the nodes of 

 intersection bear on either side a conical boss projecting at right angles. 



Genus 1. Farrea, Bowerbauk. 



The stock, which is firmly attached by an expanded base, consists of a dichotomously 

 branched tube tending to form anastomoses, or of a simple funnel-shaped cup. Beside 

 each of the medium-sized hypodermal and hypogastral pentacts, there is a group of 

 radially disposed clavulse. 



Species 1. Farrea occa (Bowerbank), Carter. 



Richly ramified dichotomous and anastomosing tubes, which are gradually widened 

 superiorly till they become as thick as a glove-finger. The parenchyma contains 

 numerous slender oxyhexasters with long cylindrical principal rays, each with three to four 

 short, markedly divergent terminals. The dermal clavute exhibit on their distal end, 

 above a terminal swelling, an externally convex marginally toothed transverse disc, or 

 else form transitions towards a simple club type, with ovoid or citron-shaped terminal 



