88 NEW YORK STATE MUSEUM 



fine striae, intersecting at nearly right angles. The cross 

 striations appear in one specimen on the transverse striations 

 as minute nodes. The presence of this extremely pretty and 

 regular surface ornamentation is not a feature distinguishing 

 it from the Utica form, as the latter, on reinvestigation also 

 shows traces of it. 



The species was originally founded on such isolated plates as 

 occur in the beds around Albany. Later, an entire specimen 

 was found, and, as it proved to consist only of two rows of 

 plates, a new genus Lepidocoleus was founded for it. 1 Two 

 more species of the same genus, one from the Kochester shales, 

 and one from the Helderbergian beds were subsequently 

 described by Dr Clarke 2 , the characters of the genus still more 

 fully elucidated and, specially, the highly simple, unmodified 

 form of this group of barnacles pointed out. In recognition of 

 the important differences between Lepidoleus and the Tur- 

 rilepadidae, Clarke has placed the genus in a distinct family, 

 the Lepidocoleidae. 



Associated with the broadly triangular plates with sigmoidal 

 base which compose by far the majority of all plates observed, 

 occur also more narrowly leaf-shaped plates with somewhat 

 drawn out apex and simply rounded base. Medially they are 

 marked by a narrow carina, extending from the apex to about 

 the middle of the base. As they are associated with the others, 

 possessing the same size and surface sculpture, they are evi- 

 dently parts of the same exoskeleton. One of these plates from 

 the Trenton shales at Port Schuyler near Albany has been fig- 

 ured by the writer in museum bulletin 42 on the Hudson river 

 shales of the vicinity of Albany (pi. 2, fig. 11). Faber's specimen 

 shows only two rows of equal plate®, which are none of them 

 oar-mate, and the distal, caudal extremity of the specimen is 

 missing. This part is retained in the specimen described by 

 Clarke from the Kochester shale ; the terminal plate of the latter 

 is described as being grooved on its narrow back. It is, therefore, 



i Cin. soc. nat. hist. Jour. 1886. 9:16. 

 2 Am. geologist. 1896. 17: 137. 



