ART. 9 NEW PAEASITIC CRUSTACEA NIEESTEASZ AND BEANDIS 5 



dorsal lobes, both agree perfectly. It is therefore probable that the 

 smaller specimens are younger and would have developed dorsal 

 lobes in a later stage, especially as slight indications of sixth and 

 seventh lobes are sometimes to be seen. 



The systematic position of this organism is quite unknown. Its 

 characters furnish no clue as to its relationships. Only a knowledge 

 of the development and the evolution of the female will answer this 

 question. 



The largest specimen is 3i^ mm. long and has a breadth of 4 mm. 



HEPTALOBUS PARADOXUS, new species 



Holotype. — Cat. No. 62733, U.S.N.M. A female with seven lobes 

 on Spirontocaris Mungwis Rathbun. 



Type locality.— Albatross Station 3329, Bering Sea, 53° 56' 50" N.; 

 167° 08' 15" W., August 21, 1890, 399 fms. 



Figures 12-14. — Heptalobds paeadoxuSj female, 12, dorsal view ; 13, ven- 

 tral SIDE ; 14, MOUTH PARTS ( ?) 



Additional material, a second female with five lobes, also on the 

 host of the type; and four females on Spirontocaris suckleyi (Stimp- 

 son) each with five lobes, Albatross Station 2842, between Unalaska 

 and Cook Inlet, Aleutian Islands. 



The construction of the ring on the ventral surface can be studied 

 in detail on Figure 14. It consists of two dark colored lateral clasps, 

 which surpass rostrally and caudally a line of thickened chitin. 

 Caudally these clasps seem to terminate in two or three teeth. The 

 rostral line of chitin surpasses the clasps laterally. Between the 

 ring some circles, also of thickened chitin, and two curved dark lines 

 are visible. 



On the dorsal surface of the figured specimen various lines are 

 found, partly indicative of the organs located beneath the surface of 



