502 ME. 1'. H. CAEPENTEE ON NEW 



B. Rays divide three times j each division of two 



joints, the axillary without a syzygy. 



a. The fourth and fifth brachials bear large 



tolerably equal pinnules 3. cequipinna, 



b. Pinnule on fourth brachial much larger 



than those on the fifth and sixth 4. imparipinna. 



C, Rays divide three times. First division of three 



joints, the axillary with a syzygy ; second of 

 two joints, the axillary without a syzygy. 

 a. About thirty cirrus-joints. Lower pin- 

 nules unlike on inner and outer arms of 

 each ray. 



1. Bases of the rays almost smooth. 



Middle and outer parts of the arms 



serrate 5. variipinna. 



2. First radials crenulate. Rays tubercu- 



lar at the base. Middle and outer 



parts of the arms smooth 6. crenulata, 



h. Fifty or more cirrus-joints. Lower pin- 

 nules similar on all the arms. 



1. Terminal cirrus-joints smooth 7- acuticirra. 



2. Terminal cirrus-joints have dorsal tu- 



bercles 8. Ludovici. 



J). Rays divide three times ; each division of three 

 joints, the axillary with a syzygy. 



a. Cirri long and stout, with imperfect claw 



and smooth terminal joints 9. bipartipinna, 



1. AlSTTEDOlSr CAEINATA, Lcm., Sp.* 



The museum contains eight examples of this species, including 

 two dry ones from Mauritius, the original home of the type. 

 They are remarkable for the very slight carination of the dorsal 

 surface of tlie arms. Had Lamarck's original specimens been 

 like these, he would assuredly never have given them the specific 

 name " carinata.'^ 



There are also two examples (sinepatria) whicli have as many as 

 thirty 'cirri, a larger number than is found on Mauritius specimens ; 

 while the pinnules are considerably stouter and more fleshy than 

 in the type, the lower ones especially having broader basal joints. 



The remaining four specimens of this widely distributed species 

 are from Java, a new locality for it. They are more like the 

 Mauritius type, having only from twenty to twenty-five cirri and 

 more slender pinnules ; but the later pinnules are much less stifi" 

 than usual, so that the arm-ends have a more feathery appearance 

 than is the case in the type. 



2. Aktedon LiEViPiNNA, n. sp. 



Description of an Individual. — Centrodorsal a thick convex disk, 



* The literature of this species will be found on pp. 179, 180 of Notes from 

 the Leyden Museum,' vol. iii. 



