No. 4. — Notes oti the ontogeny of Paradoxides, with the description of 

 a neio species from Braintree, Mass. 



By Percy E. Raymond. 



Paradoxides harlani is so large and striking a fossil, its occurrence 

 is such an oasis in the sterility of Massachusetts palaeontology, and 

 its discovery and subsequent history borders so closely upon the 

 domain of romance, that it has become one of the most widely known 

 of all the older invertebrate fossils. Although repeatedly described 

 and figured antl known from abundant material, the species has never 

 been studied from the phylogenetic standpoint, and it has not, there- 

 fore, been brought out how strikingly different this species really is 

 from most of the other members of the genus. In studying the speci- 

 mens from the viewpoint of an investigation of the growth stages and 

 relationship to other forms, the writer has been forced to the conclu- 

 sion that there are really two species present in the Hayward quarry 

 at Braintree, and the new species is now named in honor of the Messrs. 

 Hayward, father and son, who have long been proprietors of the quarry 

 which has furnished these trilobites, and who have served science by 

 the care with which they have conserved good specimens. 



Paradoxides harlani Green. 



Plate, fig. 3-6. 



Paradoxides harlani Green, Amer. journ. soi., 1834, 25, p. 336. W. B. Rogers, 

 Proc. Boston soc. nat. hist., 1856, 6, p. 27-29, 40-44. Stoddcr, Ibidem, 

 p. 369. W. B. Rogers, Amer. journ. sci., 1856, ser. 2, 22, p. 296, Edinb. 

 New philos. jour., 1856, new series, 4, p. 301 ; 1857, 6, p. 314. C. T. Ja'k- 

 son, Compte.s rend. Acad. sci. Paris, 1856, 43, p. 883; 1858, 46, p. 254, Proc. 

 Boston soc. nat. hist., 1859, 7, p. 54, 75. W. B. Rogers, Ibidem, p. 86. 

 Ordway, Ibidem, 1860, 7, p. 427, 1861, 8, p. 1-5, fig. 2. C. T. Jackson, 

 Ibidem, p. 58. Dana, Man. geol., 1863, p. 189, fig. 245. Walcott, Bulh 10, 

 U. S. geol. surv., 1884, p. 45, pi. 7, fig. 3; pi. 8, fig. lb, c, e, (non 1, la, Id); 

 pi. 9, fig. 1. Grabau, Occ. papers Bcston soc. nat. hist., 1900, 4, p. 681, 

 pi. 35, fig. 3 (after Walcott); pi. 36 (the type); pi. 37; pi. 38, fig. lb, 

 c, e; non 1, la, Id (after Walcott) ; pi. 39 (aft(>r Walcott). Shimer, Amer. 

 journ. sci., 1907, ,ser. 4, 24, p. 178. Walcott, Smithsonian misc. coll., 

 1910, 53, p. 254, fig. 12, 13, (non 10, 11). 



