VI 



Xf'lf 



The genus Stereacanthia, from the Aiulamans, is a Siphonogorgid in tin- 

 vicinity of LemnaUa. A bare, densely spiculose trunk, made up of large longi- 

 tudinal canals, with thin spiculose walls, bears a branched polyparium with the 

 polyps disposed singly or in small crowded bundles ; the aboral bands of spicules 

 on the infolded tentacles form a simple pseudo-operculum ; the spicules are warty 

 spindles or golf-club forms, and there are no quadriradiate doable-stars as in 

 Lemnah". 



The genus Agaricoides, from 6 31' N., 79 33' 45" E., is a remarkable Siphono- 

 gorgid perhaps distinctly related to Lemnalia (Gray, emend. Bourne), but quite 

 unlike any other type known to us. It is unbranched, mushroom-like, with 

 complex octagonal verrucae, pedicelled anthocodise, introversible zooids, a tenta- 

 cular operculum, echinate spindles and hockey-club forms, and many peculiarities 

 of structure. 



The genus Acanthomuricea, represented by A. ramosa, from 7 56' N., 81 

 47' E., 506 fathoms, and A. spicata from 6 31.' N., 79 38' 45" E., 401 fathoms, is a 

 Muriceid, perhaps related to Placoyorgia (Wright and Studer). The two species 

 are upright colonies, irregularly branched in one plane, with thin bark-like 

 coenenchyma of rough imbricating scales, with prominent verrucae on all sides, 

 with conical tentacular opercula, and with very heterogeneous spiculation. 



The genus Calicogorgia, represented by C. investiyatoris from 11 14' 30" N., 

 7 1 57' 15" E., 68-148 fathoms, and C. rubrotincta from the Bay of Bengal, 88 

 fathoms, is a Muriceid, probably related to Verrill's somewhat vaguely defined 

 Anthogorgia. The colonies are irregularly branched in one plane, the verrucse 

 are prominent with spicules in eight bands, with a conical operculum consisting of 

 a crown and points, with warty spindles straight or curved. 



The genus Thesioides, from 18 0' 15" N., 93 30' 45" E., 448 fathoms, 

 and 16 25' N., 93 43' 30" E., 463 fathoms, is a Kophobelemnonid, near 

 Bathyptilum, with a greatly elongated slender rachis borne by a short stalk 

 without pinnules, with long slender autozooids without calyces and without any 



spicules. 



Notes on some new Species. 



Sympodium, sp. We have described six new species of Sympodium, but 

 it seems that in this genus, as in other simple forms like Clavularia, there is 

 considerable variability in the specific characters. It may also be that a colony 

 differs considerably according to the substratum on which it grows, a vegetable 

 axis in >S. indicnm and S. d&cipiens, an Antipatharian axis in *S'. granulosum, a 

 sponge spicule in S. incrustans, a cluster of sponge spicules in S. tenue, a sponge 

 skeleton in S. pulchrum. It is not easy at present to give distinctive diagnoses 

 of our six forms, and yet the tout ensemble of the characters of each results in a 



