50 NEW YORK STATE MUSEUM 



of observation and apparently absent in the larger part of the corallum. 

 This is never the condition in F. n i agar e ns i s, but it is in F. hel- 

 derbergiae and to such a degree that Hall and Simpson entirely failed 

 to notice them and the thin sections of F . h e 1 d e rbe r or i a e in the New 

 York State Museum show that these septal spines project above the walls 

 of the corallites, more like fine granules than spines. 

 Horizon. Nos. I, 10, 16. 



Halysites catenularius Lamarck 



The specimens of Halysites at this locality show a circular section and 

 much irregularity in the meshes. After comparison with Mr Lambe's dis- 

 tinctions in this species and its varieties we prefer to leave the Dalhousie 

 specimens as above. 



Horizon. Nos. 10, 16. 



Zaphrentis shumardi (M.-E. & H.) Lambe 



See pt i, p. 113 



This is an extremely common coral at Dalhousie, and has been specially 

 studied by Mr Lambe. We have observed its occurrence in the St Alban 

 beds. 



Horizon. Nos. 1, 10, 16. 



A few other corals are recognizable in this fauna — a Syringopora, 

 Aulopora and Zaphrentis (cf. roemeri Hall). 



Specimens of Monticulipora are also not infrequent. 



Dictyonema cf. splendens Billings 



See pt I. p. 113 



Horizon. No. 10. 



Hindia fibrosa F. Roemer (sp.) 



Calamopora fibrosa F. Roemer (not Goldfuss). Silur. Fauna des westl. Tennessee. 



1S60. \). 2, pi. 2. fig. 2 

 Astylospongia in o mat a Hall. N.Y. State Cab. Nat. Hist. 1 6th An. Rep't. 1863. p. 69 

 Hindia sph ae r oi d ali s Duncan. Ann. & Mag. Nat. Hist. 1S79. 4:84,1)1.9 

 Hindia fibrosa (Roemer sp.) Hinde. Cat. Foss. Sponges Brit. Mus. 18183. p. 37, 



pi. 13, fig. 1 _ 



Hindia s p h a e r o i d a 1 i s Rauff. Palaeospongiologie. 1894. pt 1, p. 335, pi. 15-17, 



fig. 1-4 



Hindia s p h a e r o i d a 1 i s, the genotype of Hindia, was described 

 by Duncan from specimens obtained at Dalhousie. Rauff has elaborated 

 the structure of the skeleton more fully than was done by either Duncan or 

 Hinde, but his conception of the species value and construction of the name 

 will not commend itself to a respect for rules of nomenclature. It is clear 

 that the name of this fossil is Hindia fibrosa Roemer (sp. ). Cala- 



