338 Prof. Bailey on Fossil and Recent Infusoria. 



laria peregrina, P. lyra, P. didyma, Rhaphoneis Rhombus, 

 Tessella catena, Spongiolites caput-serpentis, and a few calca- 

 reous Polythalamia. The most interesting form is what appears 

 to be a new species of Dicladia, a genus which has heretofore 

 only been seen in the fossil state. A figure of the species found 

 at New Haven is given in fig. 29. 



V. Recent Infusoria in Mud from Charleston Harbor, S. C. — 

 A portion of the mud taken from the logs of a wharf in Charles- 

 ton, S. C. was given to me for examination by Mr. Tuomey. It 

 proved to be quite rich in siliceous infusoria, and also contained 

 a large number of recent calcareous Polythalamia. The follow- 

 ing is a list of the contents, as far as I have been able to identify 

 them — viz. Actinocyclus senarius, A. bisenarius, Biddulphia pul- 

 chella, Coscinodiscus excentricus, C. patijia, C. litieatus, Dictyo- 

 cha fibula « et (?, Eupodiscus Germanicus, E. Rogersii, Fra- 

 gillaria ? Navicula Baltica, N. Sigma, Pinnularia didy- 

 ma, Rhaphoneis Amphicerosl R. Rhombus, Stauroptera aspera, 

 Triceratium favus in very large and beautiful specimens, Trice- 

 ceratium Reticulum, Zygocei^os Rhombus, Zygoceros Emer- 

 sonii, B., Lithasteriscus tuberculosus, Spongiolites acicularis, S. 

 cenocephala, spines of an Echinoderm (Scutella?) and numerous 

 minute but perfect rhombohedral crystals, probably of calc spar. 



VI. Fossil Infusoria in Guano. — Believing that guano would 

 be likely to contain siliceous infusoria which had been swallow- 

 ed by sea fowl, and which would not be acted upon in the ali- 

 mentary canal, I was led to submit to microscopic examination a 

 portion of South American guano, which was furnished to me by 

 Dr. Torrey as an unadulterated specimen. By first removing the 

 soluble and volatile portions, and then diffusing the residue in 

 Canada balsam, I readily found well characterized specimens of 

 Coscinodiscus, Actinocyclus, and other marine infusoria. The 

 species appear to be such as are now living in the waters of the 

 Atlantic, but it is possible that novel and interesting forms may 

 be yet detected, and perhaps some information may by this means 

 be derived as to the relative age of the different deposits.* 



* Since the above observations were made by me, I have .received a letter from 

 Robert Harrison, Esq. of Hull, England, dated Nov. 3d, 1844, from which it ap- 

 pears that he also has sought for and found infusoria in guano. He remarks : " I 

 have also found some interesting infusorial forms in the guano of Ichaboe ; if you 

 have not seen them, you will be pleased with them." 



