242 Messrs. E. Etlieridge, Jiin., and P. H. Carpenter on 



The caljx in Granatocrinus is hio-]ily ornate. Concentric 

 strige, often becoming reticulate, or fine granules arranged in 

 lines, cover the plates. 



We append a list of doubtful species of " Pe.ntremites^'' 

 which we have been unable to refer either to Granatocrinus 

 or to SchizohJastus. We have not seen specimens of any but 

 the first mentioned ; and though figures have been jmblished 

 of some, they are of as little use as most of the specific diag- 

 noses for the determination of the generic affinities of these 

 doubtful forms : — 



Pentremifes ancjularis^ Phillips. Carboniferous Lime- 

 stone, England. 

 P. curtus, Siiumard. Archimedes Limestone (Subcarbo- 



niferous), Missouri. 

 P. Shumardt^ M. & W. Burlington group (Subcarbo- 



niferous, Iowa. 

 P. Bceiner}\ Shumard. Chemung group (Upper Devo- 



vian), Missouri. 

 ?P. cahjce^ Hall. Hamilton group (Upper Devonian), 



W. New York. 

 ?P. /er/nr, Hall. Hamilton group (Upper Devonian), 



W. New York. 

 ?P. hfcorias^ Hall. Hamilton group (Upper Devonian), 



W. New York. 

 ?P. mctia^ Hall. Hamilton group (Upper Devonian) ; 



Moscow, New York. 

 P. cornutus^ M. & W. St. -Louis group (Subcarbonife- 



rous), niinois. 

 P. fjranulatus, lloemer. 

 P. lotohlastuSj White. Subcarbonifcrous, Arizona. 



We possess in our English Carboniferous Limestone a 

 species, Pentremites elongaius^ Phillips, which is to all intents 

 and purposes a Granatocrinus, so far as general appearance 

 goes. The ambulacra, however, are relatively wider than in 

 a typical Granatocrinus; and the spiracles are formed more 

 after the type of Pentremites proper. The contracted apex and 

 base, with concavity of the latter, the long curved ambulacra, 

 long radials, and small orals, correspond nevertheless so 

 closely witli those of the former genus that we feel somewhat 

 undecided at present whether to place it there or frame a 

 separate genus for its reception. 



In its emended form Granatocrinus is strictly confined to 

 rocks of Carboniferous age — one species being found in the 

 United States of North America, and six in England. On the 



