NATURAL SCIENCES OF PHILADELPHIA. 209 



Cataphracti, nor has it any resemblance to any genus of that group. It evi- 

 dently is closely related to the Blennioids, and has even been referred to that 

 family by Dr. Gunther, who was unacquainted with its anatomy. 



Also allied to the Stichasoids is the genus Cebedichthys, a herbivorous fish 

 with a very long intestinal canal, and well developed cseca, inhabiting the 

 Pacific waters of the United States. The structure of the dorsal fin, the 

 want of ventral fins, and the form of the head, for the present detain us from 

 referring it to the family. 



Such are, in brief, the characters and relations of the family of Stichaeoids. 

 It is now proposed to submit a corrected list of the species found in the north- 

 eastern American seas, and to give the distinguishing characters by which 

 the various genera may be recognized. 



Synopsis. 



I. Body much elongated. Lateral line obsolete. D. 59 80. 



*. Pectoral fins ovate, regularly convex behind. 



* Teeth on the jaws alone. 



f V. I. 4. Body robust. D. 60-65 (63) ; A. I. 42 ; 



anterior dorsal rays graduated and united.. Centroblennius. 

 tf V. I. 3 ( 2) Body extremely elongated. D. 

 69 80 ; A. 48 55 ; Anterior dorsal short 



and nearly free Leptoblennius. 



** Teeth on the jaws and vomer. 



f B. 7. Anal nearly uniform. Caudal acute.... Lumpenus. 

 ff B. 6. Anal at its anterior half depressed. 



Caudal rounded , Anisarchus. 



ft. Pectoral fins with the upper rays abbreviated. 

 Caudal subtruncated. 

 *** Teeth on the jaws, vomer and palatines Leptoclinus. 



II. Body moderately elongated. Lateral line more or 



less developed. 



* Lateral line single, superior Stichaeus. 



** Lateral line with superior and median branches 



united in front, the median longest Eumesogrammus. 



CENTROBLENNIUS Gill. 

 Centroblennius nubilus Gill. 

 Lumpenus nubilus Rich., Last Arctic Voyages, p. 359, pi. 28. Gthr. iv., 564. 

 Centroblennius nubilus Gill, Cat. 45. 

 D. 63. A. I. 42. C. 17. P. 16. V. I. 4. 

 Hab. Wellington Sound. 



LEPTOBLENNIUS Gill. 

 Leptoblennius serpentinus Gill ex St. 

 Blennius serpentinus Storer, Proc. Boston iii. 30 ; Mems. Am. Ac. 

 Leptoblennius serpentinus Gill, Proc. Phila. Cat. 44. 



Hab. Massachusetts, Maine. 



This species, originally founded on a specimen in which a couple of the 

 middle dorsal rays were broken, and the scales rubbed off, was referred to 

 Blennius, from which I subsequently separated it, as it evidently did not be- 

 long to that genus. A specimen obtained by Dr. Stimpson, off the coast of 

 Maine, appears to be identical with Dr. Storer's species, notwithstanding the- 

 disparity in the number of rays. It has enabled me to recognize its true 

 affinities with the Lumpenus gracilis of Reinhardt, near which I had long sus- 

 pected that it belongs. The Maine specimen is colored like the Massachusetts 

 one, and has a caudal like L. gracilis, and only seventy-six dorsal spines, 

 fifty-five anal rays, the first of which is nearly under the twenty-fifth of the 



1864.] U 



