512 ME, p. H. CARPENTER ON NEW 



H. Ludwig, of Griessen, who is so well known by liis important 

 researches in Echiuoderm morphology. Like Antedon acuticirm 

 it has a large number of cirrus-joints, but they are relatively 

 shorter and wider, so that the cirri do not reach more than 

 3 centim. in length, and taper less than the longer cirri of that 

 species do ; while the later ones develop dorsal tubercles, which 

 are altogether wanting in the longer terminal joints of Ant. acuti- 

 cirra. The form o£ the cirrus-joints distinguishes Ant. Ludovici 

 from the Ant. australis, Liitk., already referred to, which it re- 

 sembles in the syzygial intervals and in the relative sizes of the 

 third and fourth joairs of pinnules, though the lower joints of 

 the latter are less strongly keeled in the Copenhagen specimen 

 than in Anf. Lndoviei. The single specimen of this last species 

 in the Hamburg Museum has two or three of the pinnules very 

 much enlarged and unnaturally overgrown. In one case the mal- 

 formation is connected with the development of a large cyst on 

 the ventral perisome of the arm, which is j)rotected by a coating 

 of polygonal plates, and is most probably the home of a parasitic 

 Myzostoma. 



9. A]S"TEDOK BIPAKTIPINKA, U. Sp, 



Description of an Individual. — Centrodorsal a thick, ylightly 

 convex disk, bearing a single marginal row of 14 long and stout 

 cirri. These may reach almost 6 centim, in length, and consist of 

 nearly 60 joints. The basal joints are very wide, nearly 2 mm. 

 the 15th and following ones about square, and the terminal joints 

 slightly longer than wide, quite smooth, with a very imperfectly 

 formed claw and no trace of an opposing spine, 



Pirst radials partially visible at the angles of the calyx ; the 

 second shorter in the middle line than at their sides, where they 

 are closely united to their fellows. Both they and the short, 

 almost triangular axillaries rise to a slight tubercular elevation 

 in the middle line of their junction. 



35 arms of 200+ joints. The rays in close contact, but dividing 

 three times. Pirst division of three joints, the axillary wdth a 

 syzygy ; the second usually the same, but sometimes of two joints^ 

 the axillary without a syzygy. The first joints after eacli Axillary 

 are rhomboidal and closely united laterally, and the second more 

 wedge-shaped, the middle of their junction being tubercular like 

 that of the two outer radials. Third brachial (syzygy) and the 

 next four or five joints oblong ; the following ones short, sharply 

 wedge-shaped and very slightly overlapping, twice as wide as long. 



