12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 



ANOMALOCARIS Whiteaves 



ANOMALOCARIS PENNSYLVANICA, new species 



Plate 5, figure 5 



A small, poorly preserved example of this peculiar animal was 

 secured from the Kinzers formation in Pennsylvania and placed in 

 Doctor Walcott's collections many years ago. Little can be said about 

 it since its characters are not well shown, but the observation may be 

 made that the appendages, of which there are 12 or 13 pairs, are 

 relatively longer than in any of the described species. The rear 

 segment appears to be rather deeply notched. 



Horizon and locality. — Lower Cambrian, Kinzers formation; 

 (loc. 12x) near Kohrerstown, Pennsylvania. 



H olotype.— Csit. No. 80487, U.S.N.M. 



ANOMALOCARIS CRANBROOKENSIS, new species 



Plate 2, figure 4 



Only one specimen of this form has been found in the Eager for- 

 mation. This species has about fourteen or fifteen abdominal seg- 

 ments and blunter appendages than A. 'pennsylvanica. The caudal 

 segment is much like that figured by Walcott ^ for A. whiteavesi. 



This like the preceding specimen is not well preserved so that it 

 is difficult to determine its features. The interesting thing in this 

 connection is the occurrence of these rare animals in such old beds 

 and associated in both cases with Tuzoia. 



Horizon and locality. — Lower Cambrian, Eager formation; 

 (loc. 67g) near Cranbrook, British Columbia. 



H olotype.— Cini. No. 80479, U.S.N.M. 



Genus PROTOCARIS Walcott, 1884 



Protocaris Walcott, 1884, Bull. U. S. Geol. Surv., No. 10, p. 50. 

 Protocaris, Walcott, 1886, Bull. U. S. Geol. Surv., No. 30, p. 147. 

 ProtooaHs Woodward, 1888, Mon. British Pal., Phyllopoda, Pal. Soc, p. 2. 



Walcott's drawing of the genotype published in 1884 has been 

 copied many times and much has been written about it. The single 

 carapace of Roddyia described in the following pages brought up the 

 question whether or not it was a Protocaris. It was quite a surprise 

 on looking at that specimen for the first time, to note at once that it 

 had two valves and was almost conspecific with the Burgess shale 

 P. pretiosa. Since hitherto P. marsM was always regarded as an 

 Apus-\\kQ form with an undivided carapace, naturally the previous 

 descriptions need revision. Walcott, however, indicated a possible 

 relationship of this primitive crustacean with "the Nebalidae 



B Canadian Alpine Jouin., vol. 1, no. 2, 1908, pi. 2, fig. 4. 



