ACTINOMETRA PKRONII. 215 



dividing three or occasioually four- times ; each division of 

 three joints, the axillary a syzygy. First distichals very 

 slightly united laterally, the first joints after the other 

 axillaries rather more closely so. Eays well separated, the 

 perisome between them and that between their first divis- 

 ions covered with minute plates. 



Arras of 150 — 200 joints, the anterior ones slightly the 

 longer. First two brachials somewhat variable in shape, 

 the first being rather the longer. The third (syzygy) short , 

 oblong or nearly square. The next five or six joints nearly 

 oblong, the following ones gradually becoming short and 

 sharply wedgeshaped with slightly raised distal edges. To- 

 wards the middle of the arm the joints are shorter and 

 blunter , with finely denticulate edges , and the terminal ones 

 are oblong or nearly square. The distal margins of most 

 of the arm-joints have pointed forward projections altern- 

 ately on opposite sides. 



First syzygium on 3rd brachial: the next from 19—25; 

 then an interval of 3— 9 , usually 3 or 4 , joints between 

 successive syzygia. 



The second joints of the arm-divisions bear long pinn- 

 ules ; the first two are tolerably equal , 30 mm. long, 

 with large basal joints. The size decreases rapidly to 

 about the 8th brachial , after which the pinnules are uni- 

 form in length for a few joints but gradually become stout- 

 er ; the following ones slowly increase in length to near 

 the end of the arm , but are always much shorter than 

 the lowest pinnules. These bear a well marked terminal 

 comb which disappears after about the 10th brachial. 



The mouth has no very definite position ; between it 

 and the anus are a few calcareous granules. 



Diameter of disc 35 mm. Spread about 25 centim. 



Colour light brown. 



Locality. The South coast of Cerara. Coll. Hoedt. 



Remarks. I believe this fine specimen to be identical 

 with two others in the Bonn and Paris Museums respect- 

 ively, which were described by Muller along with another 



Notes from the Lcyden Museum, "V^ol. lU. 



