CLADOCARPUS DISTOMUS. 17 



Two of the seven species {profunda and operculata) have the irregularly 

 branched habit of the species of Lafoea, the form of the colony of biarmata 

 is not given, and the other four have the rigid regular habit of pectinata 

 and filwvia. 



The gonosome has been found in only one of these species, pectinata, 

 by Pictet and Bedot, and there is some doubt as to the character of the 

 structures found, as, in addition to certain gonophore-like bodies, there is a 

 Coppinia cluster on the same stem. This is most beautifully figured by M. 

 Bedot on Plate 5, 1 and he suggests of the gonophore-like bodies, " il est 

 possible qu'ils representent les gonotheques d'un des sexes et la coppinie les 

 gonotheques de l'autre." 



Some of the species are closely similar, and with more material and a 

 knowledge of the gonosomes in all of them there may be some rearrange- 

 ment needed. They have a wide distribution in the Atlantic and Pacific 

 oceans and are deep-water forms, from 35 to 500 fms. 



Cladocarpus distomus, sp. nov. 

 Plate 14. 



Trophosome : — Stem compound at the base, the hydrotheca-bearing tube 

 on the surface simple in about the distal third, 50 mm. in height, but imper- 

 fect, the top being broken off, bearing, near the base, one branch which is 

 compound in its basal half, simple in its distal half ; also eight widely sepa- 

 rated alternate pinnae composed of a single tube, with the stem processes of 

 three other more proximal ones which had been broken off, one pinna on 

 the branch, and processes of four others ; pinnae divided by transverse nodes 

 into long internodes, each of which bears one hydrotheca. Hydrothecae 

 long, tapering to the base with an outer margin, which in side view is 

 slightly S-shaped, intrathecal ridge absent, margin with one prominent 

 pointed tooth and the remainder slightly uneven. Nematophores large, the 

 supra-calycine tubular, extending well above the hydrothecae, with a trans- 

 verse slit-like terminal orifice, and a circular lateral opening on the inner 

 side near the top ; the two mesial nematophores are one below the node, 

 and one below the hydrotheca, the free end of the latter not reaching to the 

 base of the hydrotheca ; they are stout, broad, with a wide transverse slit- 



1 Pictet and Bedot. Rcsultats des Campagnes Sci. du Prince de Monaco, Fasc. 13, 1900. 



2 



