Descrij^tion of Genera and Sj^ecies. (il 



Genus ANTHEACOPHAUSIA gen. nov. 



Generic Characters. — Elongated, laterally-compres.sed, prawn-like forms, with thin 

 smooth chitinous integuments generally fossilising sideways. Carapace less than one- 

 third the length of the body, loosely attached and leaving bases of limbs and tergites 

 of last trunk segment bare, produced in front into a carinate rostrum, and with only 

 slight trace of cervical fold ; peduncle of antennules long and massive, with last two 

 joints extending beyond the rostrum ; antenna with basal scale and with flagellum longer 

 than those of antennule. Seven pairs of legs all constructed alike and generally 

 diminishing in size from before backwards. Tail segments with deep epimera all directed 

 downwards and backwards ; first two pairs of appendages of tail in the males very 

 massive and specially modified for sexual purposes, one branch of the first pair being 

 furnished with coupling hooks. Luminous globules present on trunk and tail. Telson 

 nearly as long as the uropods, and furnished near its end with two articulated plates, 

 one on each side. 



Remarks. — The present genus is constructed to hold a set of fossil forms with a 

 distinct falciform rostrum distinguishing the members from those of the alread}' made 

 genus Crango'psis [Pakpocratigon'] of Salter, in which the rostrum is either inconspicuous 

 or entirely absent. In the best-preserved specimens of some of the species of the genus 

 the small globular light-producing organs are preserved. This fact, coupled with their 

 being found in the Carboniferous rocks, has suggested the name, which also serves to show 

 their relation to living forms. 



Anthracophausia dunsiana sp. nov. PI. IX., figs. 1-10. 



Specific Characters. — Average size 30^0 mm. ; general form elongated ; carapace 

 moderately long ; rostrum moderately lomj, keeled, and falciform. 



Fig. 2. — Restoration oi Anthracophausia dunsiana, mag. 2 diameters. 



General Description. — The form of the body is elongated, laterally-compressed, and 

 prawn-like, and admits of a considerable amount of variation above what may be ascribed 

 to state of preservation, the males bein<r invariablv more elonLvated in form and 



