35 



i 



much thinner, with only faint signs of pitting. The boundary 

 between the thickened and thin portions of the wing appears to 

 run transversely across the wing, not obliquely. Most of the costal 

 border missing, and venation not easily made out. A typical hexa- 

 gonal closed cell can be seen towards the middle of the thin area, 

 and part of a similar cell placed postero-basally to it. 



TYPE : Mesojassus ipsviciensis, sp. nov. 



MESOJASSUS IPSVICIENSIS, sp. nov. 



Plate 2, fig. 7. 



This small forewing may be fairly closely compared with 

 Archijassus Heeri, Geinitz (Handlirsch, Atlas, plate xliii, fig. 41), 

 which it much resembles in shape and size. The distal venation is, 

 however, rather different, as far as it can be made out, and the 

 transverse boundary separating the two parts of the wing is very 

 different from the arrangement shown in Archijassus. The latter 

 insect was found in the Upper Lias of Dobbertin, Mecklenburg. 



MEASUREMENTS : Length 6 mm., greatest breadth 1.7 mm. 

 TYPE : Spec. 33 (Plate 2, fig. 7). (B. D. Coll.) 



INSECTA INCERT.E SEDIS. 



SPECIMEN 4 appears to be a small portion of a wing of 

 Mesorthopteron locustoides, sp. nov., showing a piece of the radius, 

 and the origin of several of the branches of the media. The outline 

 of the preserved portion is deceptively like that of a complete wing 

 of small size. (Plate 1, fig. 5.) The fragment measures 13.5 mm. 

 long, 3 mm. wide. 



SPECIMEN 6. A small portion of a large wing, 19 mm. by 2 mm., 

 showing two large parallel mam veins, with two short cross-veins. 

 Possibly part of a large dragon-fly wing, consisting of costa and 

 subcosta, with two antenodals. 



SPECIMEN 7. A small insect, 6 mm. long, 3 mm. wide, resting 

 in natural position with wings folded down the back. Probably a 

 small cockroach. Venation not distinct enough to allow of definite 

 determination. 



