Observations in reply to Mr. Lonsdale' s " Remarks." 359 



Astrcea calicularis, (auct. ) is found in the Mediterranean. If I 

 am right in identifying Esper's figure with the African specimen, 

 generically, and I have no doubt there is no agreement whatever 

 between Astrcea or Astroitis calinilaris and the American fossil, 

 every essential character being different, except that the additional 

 stellated cavities are in the Columnaria ? sexradiata interstitial, 

 but even in this respect, there are many important differences — 

 Mr. Dana should have thought a little more, or given fuller 

 grounds for dissent. 



Astrcea hirto-lamellata ? (it must be for the future, Astrcea Ma- 

 rylandica, Conrad.) This fossil is said to be closely allied to the 

 preceding. (Query, Col? sexradiata? or Astroitis calicularis ?) In 

 the notice of the fossil* allusion is made to a subdivided star, and 

 though the statement is cautiously put, I had little doubt at the 

 time of the inference being correct. That process is one of the 

 leading characters of Astrcea as rightly restricted by Ehrenberg, 

 ai *d it is totally wanting in Columnaria? or Astroitis. Of Mr. 

 Dana's Pleiadia no full account has, I believe, been published. 



I have troubled you with a long letter of personal justification, 

 but it is due to yourself to shew, that I did not abuse the trust 

 you kindly committed to my care. 



Art. XXXI. — Observations in reply to Mr. Lonsdale's " Re- 



marks;" by James D. Dana. 



. The ordinary coral Zoophytes have been so imperfectly stud- 

 le d in a zoological point of view, that no discredit whatever 

 ca n properly attach to errors of judgment in the cultivators of 

 j-his department of science. This is especially true with regard to 

 Mr. Lonsdale, whose labors evince throughout, careful and assid- 

 uous study of the best authorities in this branch of science, and 

 a success well worthy the honor conferred on him by the Geolo- 

 §!cal Society of London. 



The suggestions in the volume of this Journal referred to by 

 Q im, made by me after protracted researches among living species 

 °f zoophytes, were thrown out to promote the interests of science, 

 a ud if erroneous, will be as readily retracted, and for the same 

 Purpose. But several facts are believed to sustain my former con- 

 clusions which I will endeavor to explain. 



Genus Endopachys. — The pores or foramina described as char- 



D 



fcen*,f(D.)fp 



U. scabrosa,X 



* Geological Journal, vol. i, p. 500. 



' Report on Zoophytes, p. 3ti7. t I°- P- 3 ' J0 - 



