EARLY DEVOXIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 21/ 



specimens at least) exhibiting scarcely any trace of longitudinal striae, l)ut marked with 

 numerous obscure engirdling wrinkles, from half a line to one line or more in width. In 

 addition to these, there is a set of fine striae, of which there appear to be four or five in 

 the width of one line. 



A fracture on one side of the specimen figured [fig. 4] shows that the cup is about 

 nine lines in depth. In a polished transverse section of the same specimen at one inch 

 from the base (just opposite the no. 4) forty-four principal septa are seen. Between each 

 two of these there is a septum of a secondary series. Some of these lartter appear tu be 

 obsolete, others project about a line inwards, while a few can be traced somewhat further. 

 On the cast of the interior of the cup of a specimen which appears to have been about one 

 inch in length, there are two impressions of the ])rincipal septa in one line. On the sur- 

 face of a small worn specimen, nine lines in length, tliere are five obscure septal striae in 

 the width of two lines. The principal septa on approaching the center unite with each 

 other laterally two or three at a time. The septa formed by these unions again unite, 

 thus forming fascicles of from two to seven septa in each. 



The specimens do not show clearly the depth of the cup, but it appears to be at least 

 half the length of the coral. There are several species that resemble this closely in form, 

 but I know of none with such surface characters. In species of this genus the surface is 

 covered with longitudinal striae, but in this the whole body of the coral, except a small 

 portion at the base, is only transversely striated. This is owing to the thickness of the 

 epitheca. 



Locality and formation. Split Rock, Perc^. Lower Devonian. 



This species is definitely stated to have come from the Perce Rock, but 

 of it we have seen nothing. 



Mr Lambe refers it with some doubt to Streptelasma pro- 

 lific u m, a species described by Billings from the Onondaga limestone and 

 also known to occur in the Hamilton fauna. 



Zaphrentis cingulosa Billings 



Zaphrentis cingulosa Billings, op cit. p. 10, pi. i, fig. 5 

 Zaphrentis cingulosa Lambe. op. cit. p. 1 24, pi. 8, fig. 5 



Original description. Corallum elongate, slender, cylindrical, more or less curved, with 

 a number of deep concave constrictions from five to ten lines in width. Surface with strong 

 rounded or subangular septal ridges, three or four in the width of two lines. These are 

 crossed by fine transverse striae, of which there are four or five in one line. 



The specimen, a portion only of which is figured, is six inches in length and appar- 

 ently tapers about two lines. When perfect it was probably ten or twelve inches in 

 length. It is somewhat flattened by pressure, and the form of the part figured is restored. 

 In the interior the septa are seen to reach the center and there become much twisted 

 and confused. 



Only one specimen of this has been collected, but that is quite sufficient to show 

 that it is distinct from any described form. In its surface characters it resembles S. 

 rugatula, but the deep constrictions and great length are sufficient to prove it distinct. 

 It is not certain that it is a Zaphrentis. 



Locality and formation. Mt Joli, near Perce. Gaspe limestone no. 8. 



Specimens of this species occur, as noted above, in the gray limestone, 

 which forms a reef between the Mt Joli m.assive and the Perce Rock. The 

 peripheral girdles are actually extended fringes or lips of old calices and 



