1871.] ■WOODWARD — XIPHOSTJEA. 47 



the Trenton Limestone, in the British Museum." By Henry Wood- 

 ward. (Quart. Journ. Geol. Soc. 1870, vol. xxvi. p. 486.) 



5. " The Horse-foot Crab." By the Eev, S. Lockwood, Ph.D. 

 (American Naturalist, vol. iv. No. 5, July 1870, p. 257.) 



6. " On the Embryology of Limulus polyphemus." By A. S. 

 Packard, jun., M.D, Read before the American Association for the 

 Advancement of Science, August 1870. (American JSTaturaHst, 

 vol. iv. No. 8, 1870, October, p. 498.) 



7. Note on the Trilobite from the Trenton Limestone de- 

 scribed by Mr. BiKings in the Quart. Journ. Geol. Soc. 1870. By 

 Prof. Dana. (Annals and Mag. Nat. Hist, for May 1871, p. 366 ; 

 see also Silliman's Journal for May 1871, p. 320.) 



8. " On the Structure of Trilobites." By H. Woodward. (Geol. 

 Mag. 1871, July, vol. viii. p. 289, pi. viii.) 



9. " Report of the Committee ' On the Structure and Classifica- 

 tion of the Fossil Crustacea.' " Drawn up by Henry Woodward, 

 and read at the Meeting of the British Association for the Advance- 

 ment of Science, Edinburgh, August 1871. (Since printed in Geol. 

 Mag. vol. viii. p. 521.) 



10. " Zur Embryologie und Morphologic des Limulus polyphe- 

 mus." Yon Dr. Anton Dohrn. (Jenaische Zeitschrift, Band vi. 

 Heft 4, p. 580, Tafeln xiv. & xv.) Received September 30, 1871. 



These additions comprise : — 



The discovery of a new genus of Limuloid Crustaceans (with 

 free and moveable thoracico-abdominal segments) in the Upper Si- 

 lurian of Lanarkshire, thus carrying back the Xiphosura in time to 

 a point as remote as that of the great Eurypteridan forms which 

 principally occur in this same stratum and locality. 



The discovery of branchiae in Pterygotus bilobus, var. perornatiis, 

 Salter (Pal. Soc. Mon. Merostomata, Part ii. 1869), and also in 

 SUmonia acuminata, proving the correctness of my deductions pub- 

 lished in the paper already referred to (Quart. Journ. Geol. Soc. 

 1867, vol. xxiii. p. 31, pi. ii. fig. 11), 



Pour Earypteri and two Pterygoti added, namely : — 



Eurypterus scorpioides, H. Woodw. Upper Silurian, Lanark. 



punctatus, Salter. Upper Silurian, Dudley and Leintwardine. 



obesus, H. Woodw. Upper Silurian, Lesmahagow. 



Brodiei, H. Woodw. Upper Silurian, Perton, Herefordsliire. 



Pterygotus raniceps, H. Woodw. Upper Silurian, Lesmahagow. 



taurinus, Salter (British Association Reports, Norwich, 1868, p. 78), 



Lower Old Eed or Ledbury Shales, Hereford. 



The discovery, by Mr. E. Billings, of Montreal, of what appears 

 to be good evidence of legs in Asaphus platycephalus from the Trenton 

 Limestone, further confirmed by a second specimen in the British Mu- 

 seum, which exhibits a similar structure, and also the remains of a 

 small palpus at the side of the hypostome or lip-plate. 



The researches of Drs. Packard and Anton Dohrn have greatly 

 added to our heretofore very scanty knowledge of the larval stages 

 of Limulus ; and Dr. Lockwood contributes some interesting notes on 

 the habits and oeconomy of Limulus polyphemus. A short summary 

 of these may not be thought out of place when it is remembered 



