on LITTLE-K^'OWN COMATTJL^. 509 



arms, while tlie inequality in the sizes of the lower pinnules is 

 not of the same character in the two species. 



7. AntedojST acl'ticieea, n. sp. 



Description of an Individual. — Centrodorsal a thick disk with a 

 flat dorsal surface and 15 long tapering cirri in a single marginal 

 row. These may reach 5 centim. in length and consist of 55 

 smooth joints. The basal ones are broad and the tenth about 

 square, while the following ones diminish in width and thickness, 

 though the leugth changes but little. The later ones are longer 

 than wide, but not laterally compressed, the cirri tapering gradu- 

 ally to a sharp point. Terminal claw small and but slightly 

 curved, without any trace of an opposing spine. 



Calyx variable ; some of the first radials are partially visible, 

 and some of the short second radials are partly concealed. These 

 are closely united laterally ; the axillaries nearly twice their 

 length, almost triangular, with open distal angles. 



26 long and tapering arms of 200+ joints. 8ome of the rays 

 divide three times. Eirst division of three joints, the axillary 

 with a syzygy ; and the second usually of two joints, the axillary 

 not a syzygy. First joints after each axillary closely united 

 laterally, and slightly raised in the middle line of their junction 

 with their successors. First brachials rhomboidal, short, and 

 wide ; the second more wedge-shaped. Third (syzygy) and next 

 four or five joints short and oblong ; the following ones bluntly 

 wedge-shaped, twice as wide as their longer side, and slightly 

 overlapping ; the middle and later joints more obloug and over- 

 lapping rather less. 



First syzygy on the third brachial, and the next from 0-16 ; 

 after which the syzygial interval varies from 5-32, usually from 

 10-15 joints. 



The first pinnule, borne by the second distichal, is compara- 

 tively small, with keeled and expanded basal joints. That on the 

 second brachial is considerably larger on the outer arms, but re- 

 mains small on the inner ones ; while those of the fourth and 

 sixth brachials increase in size, the latter reaching 25 mm. in 

 length, and consisting of nearly 40 joints. On the inner side of 

 the arm the third brachial bears a small pinnule like the second 

 distichal, and the next two are much larger, the second one 

 approaching the size of its fellow on the preceding (sixth) joint. 

 The following one (on 8th br.) is somewhat smaller again, though 

 still long ; and the next pair are a good deal shorter than their 



