EXPLANATION OF PLATE 24 



Fig. 1. Serpula rectiformis, n. sp. Type, no. 11262, Coll. Invert. Palae. Univ. 

 Calif., loc. 52. Natural size, a detail of one end. 



Fig. 2. Serpula rectiformis, n. sp. Same specimen as fig. 1 ; a side view, 

 natural size. 



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