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 anthocodise 

 there are eight double rows of spicules with about eight in 

 each row. Two or three pairs at the top of each row aie longer- 

 than the othei'S 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 sui'face, exposing aboral rows of white spicules ti'ansvei-sely 

 arranged. The armature of the polyp is the distinctive feature 

 of this species. 



Locality. Mouth of Wasin Harbour, 10 fathoms. 



SP0NC40DES 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 di\'ai-icate 

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

 polypaiium flattened it should be referred to Kiikenthal'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 millim. in length ; their mouths are directed inwards and 

 downwards : the Htiitzbiindel 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 are eight double rows of about 

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

 and each I'ow ends in a triangular point. The tentacles bear a 

 transverse series of yellowish spicules. Over the general surface 

 thei-e is a loose network of large, curved, yellow spindles, below 

 Avliich there is a crowded stratum of small semiti'ansjxarent forms. 



All the spicules are spindles with numerous small spines. The 

 following measurements of spicules were taken : — (a) Stiitzbiindel 

 3x0-15; {b) superficial spindles 2-5 x 0*12 ; (c) pink spindles 

 of anthocodife 0'9 X 0'08 ; (d) subjacent coenenchyma spicules 

 0-2 X 0-03. 



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

 in the cervicornis gToup. 



Locality. Wasin Channel, 10 fathoms. 



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



A veiy beautiful species which seems to be referable to a 

 position near »S'. [Dendronephthya) coronata. It belongs to the 

 umbellate type, is slightly flattened, and has an appi'oximately 

 regulai- 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 



