390 Albany Museum Records 



In the typical pygidia of H herscheli I find that there is usually a 

 distinct break at the junction of the side ribs with the axial ones. 

 The pygidium attached to the big specimen, No. 1 of the Museum 

 Catalogue, shows no trace of marginal sjunes. The pygidium 

 figured, PI. VIII. , fig. 9, associated with the small specimen may, in 

 spite of this fact, belong to the body, since this latter shows in tlie 

 unwonted smoothness of the ribs, and the prominence of the two 

 rows of great spines, that it is not quite the same as the more 

 rugged varieties showing the same marginal spines to the ribs. 



Remarks. — The series in the Albany Museum is small but 

 very interesting, as there are three distinct sizes. In the smallest. 

 No. 13, the body rings measure 3 millimetres across ; in the 

 medium sized one. No. 1, they measure a little over .5 mm., and in 

 the largest. No. 14G2, they measure 11 mm. The Rhenish species, 

 H. scaht'osus and H. roemeri have angnlai- points to the ])osterior 

 ends of the pleural, but they are very different from the spines of 

 H. lex. 



Cat. Nos. 1, 13. Donor: Mr. A. G. Fain. Locality, Ceder- 

 bergeii . 



Cat. No. 14G2. Donor : Mr. A. G. Rain. No localitv. 



PROETUS, Steiningei-. 

 Proetus ricardl, Schenck. 



PI. X., Figs. 5, 5a. 



Dr. A. Schenck records this form from the Bokkeveld beds\ 

 without, however, a description or figure. There is a vulcanite 

 cast of this form in the Albany Museum which I figure ; there is 

 no explanation in the Catalogue of how the cast was acquired, but 

 the fcssil probably was in the possession of Dr. W. G. Atherstone, 

 who gave the original to Dr. Schenck, retaining only the impres- 

 sion, as he did in the case of Phacops crista-galli. There is also 

 a head of this species catalogued as coming from the Cockscomb 

 Mountains, the ])lace where Dr. Woodward's P. cn^ta-gaUt came 



^Petenn. Mittl.., Bd. XXXIV., 1888, p. 2 c 7. 



