I u 



The specimen from Stat. 258 has rather slender cirri with 16 — 17 segments which beyond 

 the eighth are about as long as broad. P 3 is much enlarged, much larger than the other 

 pinnules, composed of 17 segments most of which are about as long as broad, 7 mm. long; 

 the lateral processes are small and narrovv (antero-distally) and are armed with. fine spines; the 

 other proximal pinnules have the segments with spinous distal ends; P a is absent on all the 

 arms of three rays, six in all. This individual approaches the African occidentale. 



no 



VII. Family Tropiümetridae A. H. Clark. 



Tropiometra A. H. Clark. 



Key to the Species of the Genus Tropiometra. 



a 1 Size large; arms 170 mm. to 230 mm. (usually over 200 mm.) long: 

 carinate processes on the brachials 



b 1 cirri large and massive, 40 mm. to 50 mm. long, with usually 35 — 40 



segments (southernjapan) macrodiscus 



b 2 cirri smaller and less massive, 30 mm. to 45 mm. (usually less than 

 40 mm.) long, with 30 — 35 (usually 30 — 33) segments (Australia, 

 except the southern coast, to northwestern Papua) . . af ra 

 a 2 Size small; arm less than 140 mm. long; each brachial bears a prominent 

 narrow median carinate process 



b 1 cirrus segments very short, more than twice as broad as long 

 c 1 less than XXVI cirri 



d 1 cirri XVI, 18; proximal pinnules very stiff, some of them 



armed with spine-like tips (Red Sea) audotiini 



d~ cirri usually about XX, with 22 — 23 segments; proximal pin- 

 nules not stiffened (southern and southeastern Africa, 

 Madagascar, and the islands in the southwestern 



Indian Ocean) carinata 



c 2 cirri XXVI — XXIX, 23 — 26; proximal pinnules stiffened (Ceylon 



and southern India, and eastward to Oceania). . . indica 

 b 2 cirrus segments longer, in the outer half or two thirds of the cirri much 

 less than twice as broad as long 



c 1 cirri large and stout ; carination of the brachials very low, often 

 scarcely noticeable (e ast coast of India, and eastward to 



"East Asia") encrinus 



c 2 cirri smaller and less stout ; carination of the brachials high and very 

 prominent, sometimes greatly exaggerated (Venezuela and the 

 southern Caribbean Sea, and southward to southern 

 Brazil) picta 



