Miscellhneous. 155 



The skull of Dendrohyrax dorsalis is elongate and depressed, 

 that of Dendrohyrax arboreus is short and high. The hinder part 

 of the lower jaw of D. dorsalis is moderately dilated, and the 

 hack edge ascenriing from the condyle is gradually rounded off; 

 whereas in D. arboreus the hinder part is much more dilated, and 

 the ascending edge is straight nearly to the hinder end and then 

 rounded. 



The following measurements show the most striking differences 

 between the skulls of the two species : — 



D. dorsalis. D. arboreus. 

 inches. inches. 



Length of adult skull 4^ 3f 



Height of skull 2| 2|l 



Length of lower tooth-line 1^ 1\ 



Width of upper part of lower jaw .... 1| 1-j^ 



The skull of D. arboreus is most like that of Hyrax Burtoni in its 

 height, but differs in the shape of the lower jaw and by the very 

 small diastemata, especially that of the lower jaw. 



On Deep-sea Dredging in the Gulf of St. Lawrence. 

 By J. P. Whiteates, F".G!S. &c. 



To the Editors of the Annals and Magazine of Natiwal Histoi-y. 



Montreal, Dec. 20, 1872, 



Gentlemen, — As I did not see any proofs of my article on Deep- 

 sea dredging in the Gulf of St, Lawrence (published in the ' Annals,' 

 ser. 4, vol. x. no. 59), I should be glad if you would correct the fol- 

 lowing typographical and other errors which occur in it. 



Page 343, lines 14 and 15 from the bottom of the page, for " only a 

 portion of these have " read " only a few of these have." 



Page 347, at the bottom, it appears as if two species of Retepora were 

 collected ; the specimens all belong to that form which Smitt calls 

 Retepora cellulosa, var. elongata. 



Page 349. Under the head Dacrydinm vitreum the phrase occurs, 

 " This and the preceding are new to America." The words with 

 quotation marks belong to the preceding species, Yoldiafrigida ; 

 Dacrydimn vitreum is not new to America, but Void ia frig ida and 

 lucid a are. 



Page 350. The asterisk placed before Utnculus pxrienuis belongs to 

 U. hyalinus ; specimens of the latter shell had been identified by 

 me as Bulla debilis, Gould. My intention was to give Mr. Jeffreys 

 as the authority for the statement that Bulla hyalina, Turton,and 

 B. debilis, Gould, are synonymous. 



Page 352, lines 10 and 11 from the bottom. Strike out the words 

 " if any such there are." 



Additions and Alterations. 



PoRAMixiFERA. The long-spincd Marginulina described on page 343 

 is, I believe, Marginidina spinosa, M. Sars. 



