from ihe Andaman Islands. 527 



funiislied with small sarcotliecre arranged biserially. Each 

 oi' the upper rows has 10 broader leaves, often contorted, and 

 also bearing sarcothecjB irregularly arranged along the 

 margins. Tlie structure seems to resemble a tj-pe of open 

 corbula where, instead of the leaves curling inwards to 

 protect the reproductive bodies, special delicate chitinous 

 wings have arisen between- the leaves, these- enclosiug the 

 gonangia in a cylinder. 



Loc. Andaman Islands. Depth 490 fathoms". 



Lytocarpus^ annandaJei, sp, n. 



Trophosome. — Colony dark brown in colour, unbranched, 

 with a fascicled stem traversed here and there by pale-coloured, 

 constrictions slanting from behind downwards and forwards. 

 The anterior tube, which is not divided into nodes, alone 

 bears hydroclades, and these are close set and alternate, and 

 are divided into regular hydrotheca-boaring internodes. The 

 hydrothecaj are closely approximated, deep, and rudely ovate 

 in outline, with an aperture facing ontwards from the stem 

 at an angle of about 45°. The lower half of their profile is 

 convex, the upper concave, while the margin bears a single 

 prominent anterior tooth, flanked by £our sinuations on each 

 side. The mesial sarcotheca is very broad, adnate for 

 more than half the height of the hydrotheca, but with a free 

 spout-like extremity ; the supra-calycine sarcothecje are 

 also very large, reach just above the margin of the liydro- 

 theca, and possess a huge aperture. The}'' are cylindrical in 

 shape, the cylinder being broken by a constriction about 

 midway, which is associated with an internal ridge traversing, 

 part of their cavity from the posterior wall. 



Tlie intrathecal ridge is little evident, but it projects into 

 the lumen of the hydrotheca from a knob of chitin termiiuiting 

 an angular inbending of the posterior wall near the floor of 

 the cavity. The bases of the two sides of the angle are 

 marked by well-defined ridges projecting into the cavity of 

 the internode, while a third ridge arises just above the bases 

 of the supra-calycine nematophores. A shorter internodal 

 ridge arises from the ])roximal portion of the anterior wall. 

 Two characteristic ridges are associated with the mesial 

 nematophore : a knob of chitin projects into the nematophore 

 cavity from the hydrotheca wall, while a sinuous septum 

 traverses the base of the nematophore cavity. 



Two large, scoop-shaped, cauline sarcothecEe lie at the 

 base of each hydroclade, and on the anterior of the hydro- 

 clade-b.aring process is a small tabular sarcotheca. 



