440 On the Jcrhoa of Mmcat. 



Account of other Species." . llesultats des Explorations entre- 

 prises aux Indes N6er]andaises Orientales en 1899-1000 a bord du 

 * Sibo'i'a,' livr. xxii. monogr. 26 bis, Leiden, 1905, pp. 132,14 plates 

 and 2 text-fioures. 



(7) ITAnMF.R, S. F., and Ridewood, W. G. " The Pterobranchia of 



the Scottish National Antarctic Expedition, 1902-1904." Trans. 

 Hoy. Soc. Edinb. xlix. 3, 7, 1913, pp. 531-505, 2 plates and 5 text- 

 figures. 



(8) LA>fK ESTER, E. R. Article " Polyzoa," Encycl. Britann. ed. 9, xix. 



ISS-^, pp. 429-441. (Contains the first published figures of 

 Cephalodiscus, made from drawings supplied by I'rof. M'Intosh.) 



(t)) , "On a new Species of Cephahdiscus {C. niyrescens) from 



the Antarctic Ocean." Proc. Roy. Soc. London, 1905, Ixxvi. B, 

 pp. 400-402, 1 plate. 



(10) M'Intosh, W. C. " Preliniinai-y Notice of Cephalodiscus, a new 



Type allied to Prof. Allraan's lihahdopleura, dredged in II. M.S. 

 ' Challenger.' "' Ann. & Mag. Nat. Hist. v5) x. 1882, pp. 337-348. 



(11) , " Preliminary Note on Cephalodiscus, a new Form allied to 



Prof. AUmau's Rhahdopleura." Rep. Brit. Assoc. (Southampton, 

 1882) 1883, pp. 596-597. 



(12) , "Report on Cephalodiscus dodeccdophnsP 'Challenger' 



Reports, Zool. xx. 62, 1887, with an Appendix by S. F. llarmer, 

 p]). 48, 7 plates and 6 text-figures. 



(13) L'iDKWOOD, W. G. "A new Species of Cephalodiscus (C. f/ilchristi) 



from the Cape Seas." Marine Investigations, South Africa, iv. 

 (Cape Town, 1906) pp. 17.''.-192, 3 plates and 5 text-figures. 



(14.) . "Pterobranchia; Cej)hah)discus." National Antarctic Expe- 

 dition [' Discovery '], Nat. Hist. ii. (London, Brit. Mas.), 1907, 

 pp. 1-67, 7 plates and 17 text-figures. 



(ij) , "On Specimens of Cephalodiscus tiiffrescens sviY^'powAl to have 



been dredged in 1841 or 1842." Ann. & Mag. Nat. Hist. (8) x. 

 1912, pp. 550-556, 1 text-figure. 



(16) . British Antarctic ('Terra Nova') Expedition, 1910; Nat. 



Hist. Reports, Zool. iv. 2, Cephalodiscus (London, 13rit. Mus.), 1918, 

 pp. 11-82; 5 plates and a map, and 12 text-figures. 



(17) . Australasian Antarctic Expedition, 1911-1914, Sci. Reports, 



ser. C, iii. 2. " The Pterobranchia," 1918 (Sydney), pp. 25, 2 plates 

 and 3 text-figures. 



(18) . "A Key for the Ready Identification of the Species of 



Cephalodiscus:' Ann. & Mag. Nat. Hist. (9) v. 1920, pp. 407-410. 



(19) ScHEPOTiEFF, A. "Die Pterobranchier des Indischen Ozeans." 



Zool. Jahrb., Abth. Syst. xxviii. 4, 1009, pp. 429-448, 2 plates. 



EXPLANATION OF PLATE XII. 



Photographs, of the natural size, of two specimens of Cephalodiscus densns, 

 Auderssoi), dredged by the 'Challenger' in Royal Sound, Ker- 

 guelen Island, Jan. 17th, 1874, from a depth of 25 fath. A, top 

 view; B, side view. 



XLIII. — The Jerboa of Muscat. By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 

 While determining an example of Jaculus loftusi obtained 

 near Baghdad by Major Clieesman, my attention has been 

 drawn to the examples from Muscat presented by Dr. Jayakar 

 and liitherto referred to tlie same species. But with six 



