Jordan and Evcnnann.— Fishes of North America. 2757 



owing to the superstitions fear of tbe fishermen. (Named for Rev. Joseph 

 Seed Roberts.) 



Ceratohaiu robertsii, Boulenger, Ann. Mag. Nat. Hist., ser. 6,vol..xx, August, 1897, 227, 

 Jamaica. (Type iu British Mus. Coll. J . S. Roberts.) 



Page 105. Ther»> is no truth in the statement that Acipenser mediros- 

 tris is poisonous. It is a good food-fish, and on the coast of Washington 

 it is somewhat abundant. 



Page 116. 



ADDITIONAL NOTES ON TACHYSURIN^. 



In the text of this work, pages 116 to 133, the descriptions of tlie 

 species of Tavhysurinw are for the most part too brief to render certain 

 the discrimination of species. The following additional descriptions of 

 these species will be found useful as supplementary to those given m the 

 text. A slight change in the arrangement of the genera has been found 

 desirable, and 3 new species are added. 



70. SCIADEICHTHYS, Bleeker. 



Dorsal shield much enlarged, formed like an armorial shield; teeth 

 on palate villiform ; posterior nasal openings not connected by membrane; 

 band of palatine teeth extended backward. 



165. SCIADEICHTHYS TROSCHELI (Gill). 



Head SJ (3^ in total with caudal) ; width of head 4i (4^ in total) ; depth 

 o (61). D. I, 7; P. I, 12; A. 18. Body comparatively robust, broad 

 anteriorly; head' not much depressed, broader than high; eye moderate, 

 7 to 8 times in length of head; width of iuterorbital space If; breadth of 

 mouth 1|: length of snout 3i. Teeth all villiform; band of vomerine 

 teetb simple, trapezoidal, quadrangular, longer than broad, without 

 division on median line ; band of palatine teeth very large, each separated 

 in young specimens from the vomerine band by a narrow toothless line; 

 iu old specimens the vomerine and palatine bands are wholly continent; 

 each palatine band with a narrow backward prolongation on the median 

 line- band of premaxillary teeth broad, about six times as long as wide; 

 lower jaw included. Maxillary barbel nearly or quite reaching gill 

 opening; outer mental barbels about g head, the inner nearly i. Dorsal 

 shield much larger than in most species, shaped like an armorial shield, 

 its posterior margin concave, its anterior end acute, wedged into a deep 

 emargination of the occipital process, the two becoming coossified with 

 age- lenHh of antedorsal plate on the median line 5 to 6 in head, a little 

 more than its width ; occipital process short and broad, much broader 

 than long, its median line with a broad keel, its edges nearly straight. 

 Shields all coarsely granular, the granulations anteriorly forming radiat- 

 ing stria^. Fontanel large, claviform, broadest posteriorly, its posterior 

 end about midway between tip of snout and front of dorsal, its greatest 



