86 Mr. J. S. Baly on new Species o/* Dorypliora. 



dulation the more limited will be its extent, and vice 

 versa ; yet this structure does not always present the same 

 figure. 



The natural surface of Stromatopora concentrica from the 

 Devonian Limestone is represented in fig. 19, and that from 

 the Silurian formation (which Mr. Sollas lent me) in fig. 24 

 (' Annals,' 1877, vol. xix. pi. viii.), where the pores (?calicles) 

 are not only larger, but, to the best of my remembrance, the 

 main structure of the corallum in the Silurian specimen was 

 like that of Caunoporaj that is, like that of Millepora alcicornis. 

 The natural surface of Caunoijora is represented in fig. 20, 

 pi. viii. (/. c). 



It must not, however, be inferred^ because I have considered 

 this hexactinellid structure " identical in appearance " with 

 that of Zittel's suborder Dictyonina (* Annals,' 1877, vol. xx. 

 p. 416), that elementarily it is so ; for in this consists the dif- 

 ference between the hexactinellid structure of Stromatopora 

 concentrica and its varieties and that of the vitreous sponges 

 with octahedral elements (' Annals,' 1877, vol. xix. pi. ix. 

 figs. 11, 12). 



The pores (? calicles) are in the interstices of the hexacti- 

 nellid stnicture ; but I cannot say more about them than that, 

 by their minuteness in S. concentrica, they appear to have 

 belonged to a Hydroid, rather than to an Actinozoie 

 polyp. 



XI. — Descriptions of three Species of Dory phora f-om Peru 

 and the Amazons. By J. S. Baly, F.L.S. 



Doryphora modesta. 



D. rotundato-ovata, valde convexa, pallide picea, subtus nitida, 

 supra subopaca, antennis fulvis, capite thoraceque pallide casta- 

 neis, minute punctatis, facie inter oculos flava ; elytris tenuissime 

 punctato-striatip, striis confuse gemellatis, sordide fulvis, oli- 

 vaceo tinctis, margine basali, limbo iiiflexo lineisque suturali et 

 laterali angustis (his pone medium fere deletis) pieeis. 



Long. 5^ lin. 



Hah. Amazons, Santarem. 



Face between the eyes broad, plane, minutely granulose, 

 sparingly impressed with fine punctures ; median space with 

 a slender, very slightly raised, longitudinal line; jaws coarsely 

 punctured ; antennge longer than the head and thorax, pale 



