490 ME. p. H. CAEPENTEE ON NEW 



are much elongated, readiing 2| mm., with a slight tendency to 

 overlap one another on the ventral side of the cirrus. There are 

 probably about 35 joints, the length much exceeding the breadth 

 till the penultimate, which is followed by a very small terminal 

 claw. The last six joints taper rapidly. 



The basal ring is a very thin plate rising at the interradial angles 

 into triangular elevations, which are produced slightly outwards 

 and rest upon the upper ends of the interradial ridgesof the centro- 

 dorsal. Eirst radials broad and tolerably flat, their size varying 

 with the age of the individual. Second radials more arched, ob- 

 long, and quite free laterally, their breadth in the adult being one 

 and a half times their length. Axillaries pentagonal, twice the 

 length of the second radials, into which they have a slight back- 

 ward projection. Their width is about equal to their length, but 

 their proportions and. also those of the second radials vary slightly 

 in difierent individuals. 



First brachials well separated laterally, with their inner sides 

 shorter than the more rounded outer ones. Second brachials 

 irregularly quadrate, projecting slightly backwards into the first. 

 The following joints have markedly unequal sides. Except in the 

 syzygial joints the length is at first less than the breadtb, but 

 gradually becomes more equal, and exceeds it after the fifteenth 

 joint. Terminal joints relatively longer and more equal-sided. 

 Arm-bases smooth, but the middle and later joints overlap 

 slightly. 



The first syzygium on the third brachial. The following syzygia 

 at intervals of from one to six, usually of two or three joints. 



Eirst pinnule nearly always on the 12th brachial, and consisting 

 of about a dozen elongated joints. The following ones increase 

 in size and in the number of joints, decreasing again towards the 

 arm-ends. The lower joints of the middle and later pinnules 

 bear irregular spinous processes on their dorsal edges. 



Mouth excentric, and surrounded by a large peristome. Im- 

 mediately behind this is the anal tube, which is thus nearly cen- 

 tral. Disk 6 mm. in diameter. In the ' Challenger ' specimen a 

 few minute calcareous granules are visible on its ventral surface, 

 and also on its sides between the rays. The ' Blake ' specimens 

 are more naked. The brachial ambulacra lie close down upon 

 and between the muscular bundles, and have a few scattered 

 sacculi at their sides. Colour of skeleton white or brownish 

 white. 



