Description of Genera and Species. 75 



those structures they are spht up and their contents are partly scattered. Egg-sacs with 

 ova are shown in another species of this genus (pi. xii., fig. 8.) 



The pleopods of the second tail segment are shown in fig. 11, and seem to be of the 

 ordinary construction. The uropods are considerably longer than the telson, and are 

 quite shrimp-like in construction. 



Fig. 13 is the restored tail magnified, and fig. 14 is an attempt at a restoration of 

 this beautiful opossum shrimp a little over three times the natural size. 



Remarks. — Although the specimens were not found in Scotland they form part oi' 

 the Jermyn Street collection, and have been made use of in the present memoir. They 

 were collected by Mr. John Rhodes, whose name I wish to associate with this elegant 

 species. 



Locality. — Chattlehope, Eede Water, Northumberland. 



Horizon. — Cementstone Group (Tuediau), (Scottish) Calciferous Sandstone Series ; 

 (English) Carboniferous Limestone. 



Collector. — -J. Ehodes. 



Crangopsis magna sp. nov. PI. XL. fig. 15. 



General Description. — The remains, as may be seen from the specimen, are those 

 of a male. To judge from the portion of the carapace preserved, which shows only the 

 hinder end of the wing or side lappet, it must have been shorter and deeper in propor- 

 tion than in C. rhodesi, and also differed from it in having only a comparatively narrow 

 plain bordering band. 



The tail is constructed almost identically as in C. rhodesi, Inil is more massive 

 relatively to its length. The epimera are deep, narrow, and pointed backwards, and those 

 of the second segment are not carried forward on to those of the first. The telson is 

 much as in C. rhodesi, and similarly ornamented along its antero-lateral parts, but appears 

 to be shorter relatively to the uropods than in that form. 



None of the appendages of the trunk have been observed, and, except the uropods, 

 the only tail appendages are the enormously developed pleopods of the first and second 

 segment, which show that the specimen is a male. Only the basal joint of the first pair 

 are seen, but thev are long and massive. Three joints of one of the second pair are shown. 



Remarks. — This name is proposed for a large form which must have measured 45- 

 50 mm. at least. It belongs to the same group of species as C. rhodesi and C. coutisl 

 in the arrangement of the epimera of its tail segments, and might almost be considered a 

 variety of the former, IVom which, however, it differs in proportions as well as in size. 



