KHIZOSTOM^ — LYCHNOKHIZA. 



675 



sensory pit with dendritic furrows over its floor. 96 (8X 12) lappets, 10 hluntl)' pointed velar 

 lappets between 2 somewhat smaller ocular lappets in each octant. Arm-disk 48 mm. wide 

 where it arises from the subumbrella, but only 40 mm. wide at the level of origin of the 8 mouth- 

 arms. The 4 subgenital ostia (s g o) are crescent-shaped and each is covered above by a 

 gelatinous flap. The}' are only half as wide as the perradial columns between them. Each 

 perradial column exhibits a niche, n, figs. 413 and 414, on its outer side which bears a super- 

 ficial resemblance to the subgenital ostia. The subgenital cavity is unitary. • i h 



The 8 mouth-arms are laterally compressed and 36 mm. long, the lower 3-winged'parts of 

 the arms being 24 long and 23 wide. Numerous simple, lateralh- flattened, tapering filaments 

 arise from between the frilled mouths on all sides of the mouth-arms and from the aim-disk. 

 The filaments upon the arm-disk are about 30 mm. long, but those from the outer jiaiis of the 

 mouth-arms are shorter. 



The central stomach is crucitorm and about 40 mm. wide. 16 simple radial-canals, 8 

 rhopalar and 8 adradial. These are all put into intercommunication with a wide ring-canal 

 which is at some distance inward fiom the margin. The adradial canals terininate in this 

 ring-canal, but the rhopalar canals e.xtend onward to the sense-organs. On its inner side the 



413. 



41.; 



414. 



Fir.. 415. — Lychnorhizabartscht. Drawn by the author. A, Oral view. B, sense-organ seen from exumbrella side. 

 Fig. 414. — Lychnorhiza hartschi, sp. nov. Natural size, drawn by the author, sgo, subgenital ostium, n, niche in perradial 

 column of arm-disk. 



ring-canal gives rise to 16 blindly ending networks of vessels which do not connect either with 

 the stomach or with the radial-canals. On its outer side a fine-meshed network of vessels arises 

 from the ring-canal and fuses with the rhopalar vessels. Around the margin at the bases of 

 the lappets there is a marginal ring-canal of fine caliber. There is a unitary uninterrupted 

 system of ring-muscles in the marginal zone of the subumbrella, but there are no radial 

 muscles. 



The gelatinous substance is translucent and milky in formalin, and the gonads, mouth- 

 frills, and canal-system are milk\-yellow. I am told by Dr. Bartsch that these colors in the 

 living animal were nearly as they appear in the formalin specimen. 



A single speciinen was found by the U. S. Fisheries Bureau steamer. Albatross, at Jolo 

 Anchorage, Philippine Islands, on February 13, 1908 (text-figs. 413 and 414)- 



