1885.J NATURAL SCIENCES OF PHILADELPHIA. 359 



CORRECTIONS. 



On p. 252 ( Ex. Ed., p. 30), 2d line from bottom, read : "wholly or partly" 

 before the word "ventrally." 



On p. 268 (Ex. Ed., p. 40), 10th line from top, we stated that Prof. Zittel 

 had been the next writer after Prof. Allman, who acknowledged the presence 

 of orals in Ilaplocrinus, Coccocrinus, and the Cyathocrinidse ; we discovered 

 however since that Dr. Carpenter already alludes to them in his paper of 

 April, 1879, while Prof. ZitteFs Handbuch der Palaeontologie appeared in 

 January, 1880. 



On p. 275 (Ex. Ed., p. 53), 9th line from top, read : " peristomeal area" 

 in place of "tentacular vestibule." 



On p. 280 (Ex. Ed., p. 58), 2d line from bottom, after the woid Allagecrinus 

 insert the following: "in which the whole ventral side were constructed of 

 actinal plates." 1 



On p. 281 (Ex. Ed., p. 59), 13th line from bottom, read: "the latter are 

 rarely perforated" in place of "not perforated." 



On p. 284 (Ex. Ed., p. 62), 16th line from bottom, in place of "and that 

 these C'rinoids possessed an orocentral nervous system like all other 

 Echinoderms, except the JSTeocrinoidea, in which the nervous system, as 

 now generally admitted, is connected with the chambered organ within the 

 basal cavity," insert the following: ''and that perhaps in these C'rinoids, 

 contrary to others, and to the Ncocrinoidea generally, the entire nervous system 

 was located at the oral side, in conformity with other Echinoderms." 



On p. 293 (Ex. Ed., p. 71 ), 4th line from bottom, in place of "were covered" 

 read : "were succeeded." 



On p. 294 (Ex. Ed., p. 72), at the top of page, we expressed our surprise 

 that Dr. P. H. Carpenter admitted calyx interradials in Apioerinus roissyanus 

 and not in A. Meriani, A. Rathieri and A. murchisonianus. On pp. 149-151, 

 and also on p. 183 in the Challenger Report, and wherever Dr. Carpenter 

 speaks of calyx interradials in Neocrinoidea, he refers to the genera 

 Quettardicrinus, Uintarvinus and to Apioerinus roissyanus, without men- 

 tioning the three other well-known species, in which plates are distributed 

 interradially likewise, and in a similar manner. All this led us to the 

 conclusion that he regarded the plate.-, of the latter species as wholly 

 perisomic. Dr. Carpenter informed us since that he never I eld such view, 

 and that he regards the plates in question in all four species as representing 

 substantially the same thing. It must be, further stated that Dr. Carpenter 

 admits in A. roissyanus as calyx interradials the whole series of plates up 

 to the top of the second radials, and not only the first plate, as we thought 

 to infer from his figure on p. 1">0. and from his descriptions. "We are 

 pleased to make this correction, at the same time we are at a loss to know 

 where the small plates commence to which the letter i alludes, and which, 

 as stated by Carpenter himself (Challenger Rep., p. 150\ "pass gradually 

 upwards into those of the ventral side." 



