HAMBACH STRUCTURE & CLASSIFICATION OF PENTREMITES. 537 



Notes about the Structure and Classification of 

 the Pentremites. 



Bj G. Hambach. 



Mr. Carpenter, in criticising my paper on the Anatomy of the 

 Blastoidea, not only expresses great doubts as to the correctness 

 of my statements, but has the assurance to refer the results of my 

 observations to a " wonderful power of imagination." In reply 

 to this I will say the following : 



Mr. Carpenter says on p. 419 of his paper,* I had figured and 

 described a section of a ray of Granatocrinus Norwoodi^ but, in 

 spite of all advantages for examining beautiful specimens, even 

 the original which served for my description, he is at a loss to 

 understand the meaning. If Mr. Carpenter will go to the trouble 

 of reading my little paper carefully, he will be convinced that the 

 figures were not taken from Granatocrinus Norwoodi^ but that 

 I distinctly said, " at least in the typical ones, as Pentremites 

 Jiorealis, sulcatus, pyriformis, etc.'' 



My Fig. 9, on plate A, represents an oblique section through 

 a fork piece and ambulacral field of P. sulcatus. Fig. 14 an inte- 

 rior view of the same. Fig. 16 an interior view of an ambulacral 

 field alone. Both figures are taken from P. sulcatus, and show 

 the longitudinal furrow of the lancet piece very well, which has 

 been already observed and described by Roemer, p. 13.! 



As to the second statement he makes, that of having examined 

 the original serving me for my description, I must doubt very 

 much the possibility of this, as I never send one of my type spe- 

 cimens away or missed them out of my collection. 



That the lancet piece is perforated by a very fine canal through 

 the centre, in its whole length, was, so far as 1 know, first de- 

 scribed by me, and not by Mr. Rofe ; for he takes it to be a suture, 

 meaning that the lancet piece was composed of two pieces. Mr. 

 Wachsmuth does not describe or figure the same in his " Palaeo- 

 crinidea," Fart I., but it is figured in Part II., after I had drawn 

 attention to it. This canal, as already stated, is easily seen by 



* " On certain Points in the Morphology of the Blastoidea," Annals atid Magazine of 

 Natural History for December, 1881. 



t " Monographic der Blastoideen, 1852," and "Archiv fur Naturgeschichte," Jahrg-. 

 xvii. Bd. I. 



