5u4 On a nac Cavernulari'd from Ceyhn, 



Tliere seems no rconi for doubt that tliis lemaik ible form 

 is related to ^^ Cavernularia," e. g., in general club-like sliapCj 

 distinction between stock and trunk, dimorphism of zooids, 

 and in the absence of spicules from the polyp-tentacles. A 

 tabular contrast between Kulliker's description of the genus 

 and the characters of Herdman^s specimen will show the 

 distinctiveness of tlie latter : — 



(a) Polyps 3-7 niru. in length. («) Xot exceeding 1 mm. 



{b) A.\is small or ab^^eut. (6) Axis absent. 



(t) Spicules kmfr and slender, also (c) Besides the long and slender 

 slightly flattened. forms, which show no trace 



of ilattening, there are very 

 numerous short broad forma 

 of very diverse shapes. 



{d) Stock and trunk cylindrical. {d) liather elliptical. 



{e) Stock and trunk continuous. [e] Separated by a constriction. 



(/) Four canals in trunk and stock {f) Three canals in the stock, 

 well developed. Avhich become less distinct, 



almost appearing as two in 

 the trunk. 

 (f/) Zonids not so numerous as in 

 Kolliker's description. 



Thus Herdman's specimen differs from Cavernukiri'a in 

 the length of the autozooids, in the frequency of the sij)hono- 

 zooids, in the shape and character of the stock and trunk, in 

 the number of longitudinal canals, and in the details of 

 spiculation. Although Cavernularia obesa is a. vnr'inhlQ form, 

 none of the varieties present any close resemblance to our 

 specimen. It also differs from C. madeirensis (Studer) both 

 in the size and frequency of the zooids. The genera IStylo- 

 helemnon (Kolliker) and Stylohehmnoides (Thomson and 

 Henderson) need not be considered. 



• It seems necessary, therefore, to establish a new genus in 

 the subfamily Cavernularidse, and it is interesting to note 

 that the Ceylon collection included another new genus [Stylo- 

 helemnoides) also in the same subfamily. I propose to name 

 the new form 



Fusticidaria Ilerdniaiii, gen. et sp. n. (Pi. XVII.) 



A somewhat sponge-like Cavernularid with a flattened 

 ovoid stock separated by a constriction from a comparatively 

 slender sterile trunk ; with dimorphic retractile polyps, the 

 autozooids not exceeding 1 mm. in length, the much smaller 

 siphonozooids scattered irregularly among the autozooids ; 

 with abundant densely sj^iculate coenenchyma, traversed by 

 three longitudinal central camils passing down into the 



