BY R. VON LENDENFELD, PH.D. 1113 



Locality : East Coast of Australia, Port Jackson. Von Len- 

 denfeld. 



28. SPECIES. VOSMAERIA IMPERFECTA. Von Lendenfekl. 

 LEUCETTA IMPERFECTA. N. Pol^jaeff (1.) 



This species is bare-mouthed, of tubular, elongated, cylindrical 

 form, 35 mm. long, and 5 mm. in diameter, the thickness of the 

 wall being 1-25 mm. that of the cortex 0-35. Both the surfaces 

 are rather rough. The characteristic peculiarities of the species 

 consists in the form of its pigmy trii'adiate, and in the presence of 

 the parenchyma of large quadriradiate spicules, not differing either 

 in size or in form from those of the cortex ; these last are not 

 numerous. 



Gastric quadriradiate spicules. All more or less regular ; facial 

 rays straight, smooth, tapering from the base to approximately 

 sharp points 06 mm. long, diameter varying 0'006 mm. 

 20"008 mm. Apical ray either straight or curved, often 

 irregularly bent, sharply pointed ; length constant, reaching 

 0'08 mm. Minute quadriradiate and triradiate spicules of the 

 Parenchyma. Quadriradiates just of the same form and dimensions 

 as those of the gastric surface, not numerous ; triradiates still 

 smaller, their rays rarely exceeding 0-025 mm. in length, and 

 0-002 mm. in diameter; some of these are regular, their straight 

 and smooth rays tapering from the base to sharp points ; but such 

 regular triradiate forms are extremely rare ; most present only two 

 rays, forming an angle varying from 120° to 16°, the basal ray 

 having become rudimentary, and being represented only by a 

 small process at the crossing of the lateral rays. 



Quadriradiate sjncules of the Parenchyma and cortex. Both of 

 the same form and the same very inconstant dimensions, the length 

 of their rays varying fi-om 0-3 mm. to 1 mm., and even more. 

 Eegular rays smooth, tapering from the base to sharp points, 

 visually ten times as long as thick. 



(1.) N. PoUjaeff. Report on the Calcarea. The Zoology of the Voyage 

 of H.M.S. Challenger. Part XIV., p. 67, PI VII., figs. 9a-9c. 



