Dr. Richardson on a new genus of Gobioid Fish. 461 



3. Eu, triodon ? Ehr. Frustules with three ridges on the dorsum. 

 Ehr. Infus. p. 192. t. 21. f. 24; Pritch. Infus. p. 214. f. 164 ?; 

 Bailey, /. c. pi. 2. f. 30. 



In Cold Bath Spring near Tunbridge Wells, Mr. Jenner. 



Frustules very minute, with two indistinct puncta at each end. 

 The lateral view is slightly concave on one side, and on the other 

 convex with three dentations ; strise wanting or indistinct. 



The form of this species greatly resembles a single frustule of 

 Fragilaria pectinalis /5*, but is smaller; the protuberances also 

 are larger in proportion to the size of the plant. 



The figure in the ' American Bacillaria' is much larger and has 

 distinct lateral striae, and was probably taken from an older spe- 

 cimen. 



Plate XIV. fig. 3. Eunotia triodon: a, front view; 5, lateral view. 



4. Eu. tetraodon, Ehr. Frustules with four ridges on the dorsum ; 

 lateral striae distinct. Ehr. Infus. p. 192. t. 21 . f. 25 ; Pritch. Infus. 

 p. 214 ; Bailey, /. c. pi. 2. f. 31. 



In boggy pools, rare. Dolgelley and Penzance, /. R.\ Weston 

 Bogs near Southampton, Mr. Jenner. 



This is a large species : in the front view the puncta are distinct ; 

 in the lateral view one margin is very concave, and the other very 

 convex with four large, rounded elevations, and a constriction near 

 each end. The strongly marked striae slightly converge towards 

 the concave margin. 



Plate XIV. fig. 4. Eunotia tetraodon: a, front view ; b, dorsum ; c, la- 

 teral view. 



LII. — Description of a new Genus of Gobioid Fish. By John 

 Richardson, M.D., F.R.S. &c. 



To Richard Taylor, Esq. 

 My dear Sir, Haslar Hospital, 17th April, 1844. 



I SEND you the generic characters of a gobioid fish discovered 

 by Sir James Clark Ross at Kerguelen^s Land, on his recent ant- 

 arctic voyage. The genus will occupy a place in the system 

 near Callionymus and Trichonotus, and affords a connecting link 

 between the Gm'nards and Gobies. 



I remain, dear Sir, yours faithfully, 



John Richardson. 



Channichthys, Richardson. 



Caput magnum, cranio scabro, subtetragono ; facie horizontali, 

 depressiuscula, ante oculos longa, lateraliterque per parietes oris 

 membranaceos aucta. 



Faux laxissima, horizontalis, terminalis ; rictu superne ab ossibus 



* This may he the Fragilaria trionodis, Ehr., a species 1 am unacquainted 

 with except by name. 



