CRUSTACEA. 209 



Order Proparia 



Family Phacopidae 



Genus Dalmanites Barrande 



Dalmaniles cf. griff oni Clarke 



Plate 55, figure 1 



Description — A few portions of cephala, that present a considerable range in size, 

 suggest that of D. griffoni described by Clarke from the St. Alban beds of Gaspe. 



Clarke's description follows: 1 "There occurs in the Grande Cavee outcrops a 

 Dalmanites having the characters of D. micrurus Green. In lobation of tail there is little 

 to distinguish it from that species and the general outline of the head and of the glabellar 

 lobes is similar, but in excavating these fossils from the compact residual clay into 

 which the rock has altered, I observed and made sketch of a cephalon on the anterior 

 limb of which was a very pronounced elongate and spatulate extension, as is represented 

 in the outline in our figure. This was so fragile that I was unable to preserve it and no 

 other specimen of the cephalon was complete in this frontal region. It is such a pro- 

 longation or snout as one sees in Salter's figure of D. longicaudatus (British Trilobites, 

 1864, pi. 3, fig. 19), from the Wenlock shale which one may regard as an incipient 

 condition of the Probolium condition. It seems, hence, eminently appropriate to find 

 this development accompanying a condition of complete glabellar lobation character- 

 istic of true Odontochile, and likewise to find this expression of Dalmanites in earliest 

 Devonic as well as in latest Siluric rocks." 



In the case of the best preserved specimen, the width of the snout at its inception is 

 10 mm. and its probable length about 5 mm.; the one eye preserved has an elevation of 

 about 8 ranges of lenses; the unexfoliated portion — practically all of the border and 

 small portions of the cephalon contiguous to the border — appears granulose under the 

 hand lens. The axial length of the cephalon — inclusive of the snout — was about 26 mm. 

 and the width about 52 mm. 



Dalmanites sp. 



Plate 55, figures 2-7; plate 56, figure 1 



Description — Several portions of pygidia and cephala are provisionally regarded 

 as representatives of a single species — probably that of the specimens described above 

 as suggestive of D. griffoni Clarke. 



The specimen that represents the smallest cephalon, which had an axial length of 

 about 10 mm. and a width of about 20 mm., retains one eye which has an elevation of 

 8 ranges of lenses. 



The best preserved specimen, and the one that represents the smallest p}'gidium — 

 length, inclusive of spine, 18 mm., width, 22 mm. — retains the impression of the spine 

 which was about 1/12 of the total length of the pygidium, has 21 axial annulations, and 

 15 pleural ribs. Two of the remaining specimens have about 21 axial annulations 

 and 14 or 15 pleural ribs, and the indications are that the others, which are more in- 

 complete, originally had a like number. 



The surface of the specimens appears granulose to the unaided eye or under the 

 hand lens. 



Dalmanites carlwegi n. sp. 



Plate 56, figure 2 

 Description — Pygidium triangular, slopes rather abruptly at sides, length — in- 

 clusive of spine — about 3/4 of width; posterior extremity a short, slightly upturned, 



'N. Y. State Mus., Mem. 9, pt. 1, p. 103, pi. 7, fig. 4; pi. 9, fig. 4, 1908. 



