REPORT ON THE ANTIPATHARIA. 139 



terminal branchlet the appearance of a frond of Hypnum. The subdivisions of the 

 terminal branchlets are usually all free. The branchlets are relatively thick, and taper 

 quickly towards the apex. They have a deep glossy brown or black colour. The 

 pinnules are slender, and have a greenish yellow tint, becoming pale yellow near the 

 apex of the secondary pinnules. 



The spines are relatively distant, and arranged in very steep, regular, dextrorse or 

 sinistrorse, spirals ; the spiral appears to follow almost equally well either way. The 

 spines are moderately long, about three-quarters the diameter of a pinnule, and are 

 subcorneal and compressed, witb the apex often slightly bent upwards. Five longitudinal 

 rows may be counted from one aspect of a pinnule ; the members of a row are about two 

 lengths apart. 



Habitat. — Mauritius (Brit. Mus.). 



Tylopathes? elegans, n. sp. (PI. XL fig. 16). 



Corallum delicate and webdike, not in one plane, forming a reticulum similar to that 

 of Tylopathes hypnoides but much more delicate. The branchlets are very slender and 

 scarcely tapering, and are only slightly thicker than the pinnules. They vary from 

 3 to 5 cm. in length, and are of similar diameter to the older portions of the axis from 

 which they arise. They bear a number of subalternate pinnules of variable length, 

 about thirteen to a centimetre. These are rarely lateral in position, and vary from 

 0*3 to 2 cm. in length. Those over 0"5 cm. long generally bear one or more secondary 

 pinnules ; the longest ones bear a dozen or more subalternately, the longest of which 

 may be 0'5 cm. in length. The arrangement is similar to that in Tylopathes hypnoides, 

 but the terminal fronds are much broader on account of the greater length of certain 

 primary pinnules. There is also no marked difference between the thickness of the 

 branches and branchlets, the whole specimen being unusually delicate. The branchlets 

 are rarely straight, and sometimes adjoining ones are curved in opposite directions 

 so as to cross one another almost at right angles. The terminal fronds have a somewhat 

 lax hypnoid growth, but the pinnules become fused with those from neighbouring 

 branchlets quite close to the apex of the corallum. The sclerenchyma has a light reddish 

 brown colour in all parts. The type specimen is 12 cm. high and 12 cm. across the 

 broadest part ; the base is not preserved. The spines are similar in shape to those of 

 Tylopathes hypnoides, but are arranged in closer spirals from left to right. They are also 

 arranged in longitudinal rows, six of which may be counted from one aspect of a pinnule. 

 The members of a row are two lengths or more apart, and the spines in some rows are 

 rather longer than those in others. 



Habitat. — Kurrachee (Murray), Brit. Mus. 



