Palaeozoic Arachnida of North America. 69 



sternites. The pleura is preserved only on the ventral surface and 

 is segmented. A deep, triangular depression extends from the an- 

 terior end of the abdomen to the middle of the second sternite, possibh' 

 the result of deformation. Of the coxae only those of the third and 

 fourth pair are preserved. They are triangular and their apices meet 

 in a median point. The pedipalpi are heavy, their joints wider than 

 long. The tarso-metatarsuL is lost, the tibia has a long internal process 

 which may have had the function of an immovable finger. The second 

 femur is 5.3 mm. long, the third 7.9 mm., the fourth (incomplete) 

 4.8 mm. The trochanters of the legs (andpalpi ?) are two-jointed. 



Specimen Xo 3085 in the collection of McGill University is the 

 type specimen of Lihellula carbonaria. I can add nothing to Scudder's 

 description and refer the reader to his plate 40, figs. 2, 6. 



Specimen No. 37964 of the U. S. National Museum from the 

 Joggins Mines, Nova Scotia, text figure 31, plate V, figure 29, belongs 

 probably to the same species. 



The cephalothorax of this specimen is so badly deformed that it is 

 impossible to reconstruct its shape. The abdomen is excellently 

 preserved and is composed of ten segments. A pair of oval depres- 

 sions in each of the first six tergites represent the places of attach- 

 ment of the dorso-ventral muscles. Only fractions of two legs are 

 preserved and they show that the legs were fully as heavy as in the 

 type specimen. The abdomen is 9.3 mm. long and 5.7 mm. wide. 



The type specimen is from the Pennsylvanic (Lower Allegheny) 

 of Mazon Creek, Illinois ; the type of Lihellula carbonaria from the 

 Pennsylvanic (" Millstone Grit ") of Cape Breton ; and specimen 

 No. 37964 from the Upper Coal Measures at Joggins Mines, Nova 

 Scotia. 



Protophrynus n. gen. 



Cephalothorax broader than long, reniform, with two pairs of eyes. 

 Trochanters normal, one-jointed. Abdomen with seven tergites. 

 Genotype P. carbonarius n. sp. 



Protophrynus carbonarius n. sp. 

 Plate VI, figs. 30, 31 ; text figs. 32, 33. 

 The type and only specimen of this species is in the collection of 

 Mr. L. E. Daniels Both the obverse and reverse are well preser- 

 ved. The flat cephalothorax is reniform with a wide projection in 

 front, 5 mm. long, 7 mm. wide. It has a median crest and lateral 

 crests radiating from it, being moulds of the longitudinal and thoracic 

 grooves. Two small, round median eyes close to anterior edge and two 

 larger, round, lateral eyes touching the sides of the projection. Abdomen 



