7. SIIiliALDIUS. 175 



transverse process of the vertebra. The first pair of ribs have double 

 heads ; but the anterior head on both sides is very incompletely deve- 

 loped, and on the right side completely detached from the remainder 

 of the bone ; it has a pointed end below, merely applied to the main 

 part of the rib ; so that if it had been lost in maceration, this rib 

 might have been supposed to be simple. On the left side it is anchy- 

 losed, but very slender. It would be interesting to ascertain, by the 

 examination of younger specimens, whether this anterior head has 

 always a separate centre of ossification, as it is not improbable that 

 this singular double-headed bone is in reality formed by the coales- 

 cence of two originally distinct ribs. The second, third, and fourth 

 ribs have small capitular processes. The stylo-hyals are very flat, 

 but not so broad proportionately as in the Java \\Tiale, being 11" 

 long and 3^" in greatest width. The bones of the fore limbs present 

 the same general characters and proportions as in the Leyden spe- 

 cimen from the Zuyder Zee. The sternum is absent. 



" This specimen has been previously mentioned in this paper as 

 an example of SlhhaJdiiis Jaticcjps, Gray, presenting some interesting 

 individual de^dations from that at Leyden, referable to the develop- 

 ment of the two skeletons not having proceeded pari passu in all 

 parts of the system.'' — Flower, P. Z. S. 1864, 417. 



** Dorml Jin i-erj/ small, far bc/tiiid, and filaced on a tliick prominence. 

 Ribs \-i.\A;Jirst short, sternal end very broad and deeply notched. 

 Sternum icith a broad short hinder lobe. Os hyuides transverse ; sides 

 slender; hinder cdae cut out in the middle. y-v",. ^ • / Ut. /./>t/ 



2. Sibbaldius borealis. The Flat-haclc. 



Sibl)aldus borealis, Gray, P. Z. 8. 1804, 223 ; Ann. ^- 3Iag. K. H. 



im4:, xiv. 352. 

 Ealeine d'Ostende, Tan Breda, en letter bock, 1827, 341 ; Dubar, Os- 



teoyr(q)hie, Bruxelles, 8vo, 1828, t. 1-10; Bernaert, ^' Notice sur lit 



Bideine echouee pri'S (FOstende,'' Paris, 1829. 

 Bak'inoptere d'Ostende, Van drr Linden, 1828, Bruxelles, 8vo. 

 The 0.*itend AMiale, Guide to the P.thibition at Charing Cross, trith 



drairinys by Scharff. 

 Great Northern Ilorrpial, " R. borealis, Lesson," Jardine, Nat. Lib. 



125. t. 5 (from Scharff'). 

 Balajua borealis (part.), Fischer, Syn. 524 (from Dubar). 

 BaLenoptera Rorqual, T)eu-hur.st, Loudon Xhiy. X. II. 1832, v. 214. 

 Babeiuiptera giga<, Exehr. A'- Peinh. Nd.Bidray, af Groeidand, 1857; 



LiUjrbory, I. c. 5(), 57 ; Malmyren, Arch. Natury. ISIjl, !J7. 

 I'terobaLxna Boops (part.), Eschr. K. Dansk. Vi'densk. 1840, 134. 

 Pterobalwna gigas. Van Beneden, Mem. Acad. Poy. Sci. Brux. 1861, 



xxxii. 37, 463 (not chai-acterized). 

 Female : — 



Balicnoptera Boops, Yarrell, Proc. Zool. Soc. 1840, 11. 

 Balajnoptera teniiirostris. Sweeting, Mag. Nat. Hist. 1840, iv. 342. 



Inhab. Xorth Sea. 



" A whale was observed floating dead in the Jsorth Sea between 

 Belgium and Kugland," and towed into the harbour of Ostend on 

 the 4th of November 1S27. The skeleton was exhibited at Charing 

 Cross, and is now, 1 believe, in the United States. / / /t 



