DISHES OF THE SANTEE BASIN. 13 



Genus BOLEOSOMA DeKay. 

 2. BOLEOSOMA MACULATICEPS Cope. 



Boleosoma maculaticeps COPE (1870), Proc. Am. Philos. Soc. 269 and 450. (Catawba 

 R.) JORDAN & COPELAND (Id76), Check List (Bull. Buffalo Soc. Nat. Hist.), 

 163. (Name only.) 



Arlina maculaticeps JORDAN (1877), Bull. U. S. Nat. Mus. x, 15. (Name only.) 

 Boltosoma olmstedi JORDAN (1877), Ann. N. Y. Lye. Nat. Hist. 368. (Ocmulgee River.) 



A single specimen taken in the Saluda Kiver at Fan's Mills answers 

 closely to Professor Cope's description. The upper part of the cheeks 

 have, however, a few scattering scales. This species is a true Boleosoma. 

 Although the type of Boleosoma has but a single anal spine and B. efful- 

 gens and B. maculaticeps have two anal spines, the essential character of 

 those spines is the same in both cases, and the gnus Arlina, based on 

 B. effulgens, is a synonym of Boleosoma. In Boleosoma, the spines are 

 all weak and flexible, and those of the anal especially so. In most or 

 all of the other genera of Etheoslomatidce, the anal spines are stiff and 

 long, and, with scarcely an exception, the first spine is the longer of the 

 two. In the species of Boleosoma, with tico anal spines, the two spines 

 are unequal, the second the longer, both extremely slender and flexible; 

 not at all u spine"-like, except that they are not inarticulate. This 

 feeble condition of the spines seems to constitute the chief generic 

 character of Boleosoma. 



Two of the species provisionally referred by Professor Jordan (Bull. 

 U. S. Xat. Mus. x) to "Arlina*) viz, Arlina stigmcea Jor. and A. atripin- 

 nis Jor., have the anal spines well developed, as usual iu Etlieostomatidce. 

 These two species and their congeners apparently constitute a distinct 

 genus, differing from Diplesium in the toothed vomer and from Notho- 

 not us in the protractile upper jaw. For this genus, the name of 

 Ulocentra (Jordan) has been suggested (Man. Vert. ed. 2d, p. 223), in 

 allusion to the development of the spines. 



Genus XOTHONOTUS Agassi* 



3. XOTHONOTUS THALASSINUS, sp. nov. 



A handsome species, differing from the others now referred to this 

 genus in the entire nakedness of the head. 



Body rather stout, the depth about 5 times in the length, com. 

 pressed behind, the back somewhat arched. Head large, 4 in length, 

 the snout rather blunt and convex in profile ; a pretty decided angle 



