CllYPTOTIIIRIA. 257 



TSOP DA . B OP 



JfORMALIA, 



Genus-CRYPTOTHIRIA. 



Cryptotliir. DANA (1852). 



LiriojH'. RATHKE (1843, not Lirlope of Lesson. Gr. Medusa^ 1839.) 



Liriopsis. SCHULTZE, Wiegm. Arch. 1859, p. 310. 



Cryptoniscus. FRITZ MULLEB MSS. 



Hemioniscus. BUCHIIOLZ. 



THE animals of this genus differ from those of most of 

 the genera of Bopyridce in the nature of their habitats (being 

 parasitic on crustaceans that are lower than themselves in 

 the natural classification) as well as in their structure ; 

 the supposed males, or at least the young, bearing a much 

 stronger resemblance to the young than to the full-grown 

 male Bopyri, whilst the females appear to be entirely 

 destitute of antennae, legs, branchial lobes, or other 

 appendages. 



The supposed males and young are very minute, oval 

 or elongate in form, convex, with the head and segments 

 of the body and tail distinct, the former semicircular, 

 provided with two eyes and four antennae, of which the 

 anterior pair are very minute and slender, whilst the 

 posterior pair are greatly elongated, being about half 

 the entire length of the animal, composed of three or 

 four moderately long basal joints, followed by a multi- 

 articulate flagellum, of which the first articulus is the 

 largest. The parts of the mouth have not been deter- 

 mined, but they appear to be covered by a large square 

 pair of plates (maxillipeds), of which the lower margin is 

 serrated, or possibly only fringed with hairs. Each of the 



VOL. II. S 



