424 PROF. J. A. THOMSON AND MR. W. D. HENDERSON ON [Apr. 10, 



Almost all the polyps are directed towards one of the two flattened 

 surfaces. 



The polyp -stalk is about 1*5 mm. in length, and is loosely 

 covered with longitudinally disposed spicules. On the anthocodiae 

 there are eight double rows of spicules with about eight in 

 each row. Two or three pai]'s at the top of each row are longer 

 than the others and convei"ge into a triangular projecting point. 

 The orange-coloured Stiitzbiindel spicule projects slightly beyond 

 the anthocodia for about 0"5 mm. The anthocodia has a rounded 

 cauliflower-like form, and the tentacles are neatly incurved on the 

 oral surface, exposing aboral rows of white spicules transversely 

 arranged. The armatui'e of the polyp is the distinctive feature 

 of this species. 



Locality. Mouth of Wasin Harbour, 10 fathoms. 



Spongodes zanzibarensis, sp. n. (Plate XXYIII. fig. 1.) 



An incomplete specimen of a beautiful colony, predominantly 

 of a canary-yellow with pink polyps. It belongs to the divaricate 

 section of the genus, and as the contour is irregular and the 

 polyparium flattened it should be referred to Kukenthal's 

 cervicornis group. The dimensions are 2'5 centims. in height, 

 2'5 centims. in maximum breadth, 0'8 centim. in thickness. 



The polyps are by no means crowded, and occur singly or in 

 bundles up to seven in number. Their stalks are short, about 

 1 miilim. in length ; their mouths are directed inwards and 

 downwards : the Stiitzbiindel has a pair of projecting pink or 

 yellow spicules extending for about 0*5 mm. beyond the anthocodia. 

 On the wall of the anthocodia there ai-e eight double rows of about 

 ten pink spicules in each row ; those on opposite sides converge, 

 and each row ends in a triangular point. The tentacles bear a 

 transverse series of yellowish spicules. Over the general surface 

 there is a loose network of large, curved, yellow spindles, below 

 which there is a crowded stratum of small semitransparent foi'ms. 



All the spicules are spindles with numerous small spines. The 

 following measurements of spicules were taken : — {a) !3tutzbundel 

 3x0'15; (h) superficial spindles 2-5xO"12; (c) pink spindles 

 of anthocodia^ 0*9 X 0"08 ; (d) subjacent coenenchyma- spicules 

 0-2 X 0-03. 



This form does not agree with any of the shoit-stalked species 

 in the cervico7'nis gi'oup. 



Locality. Wasin Channel, 10 fathoms. 



Spongodes kukenthali, sp. n. (Plate XXXI. fig. 5.) 



A very beautiful species which seems to be referable to a 

 position near ^S'. {DendronejMhya) coronata. It belongs to the 

 umbellate type, is slightly flattened, and has an approximately 

 regular outline. Its dimensions are 6 centims. in height, 6"5 in 

 breadth, and 3*75 in thickness. The stem and branches are very 

 rigid ; five of the lower branches are foliate and nearly encircle 



