368 Proceedings of the Roijal Physiccd Society. 



Ill colour this species is very striking. The ground colour 

 is a bright yellowish brown, with dark brown spots and 

 patches. A dark spot or patch extends backward obliquely 

 from each eye. There is a round dark spot about the middle 

 of the straight part of the lateral line, and another at the 

 commencement of the curved portion, while there are several 

 smaller ones on the posterior part of the head, and one at the 

 base of the pectoral. The vertical fins are pale, but every 

 sixth or seventh ray is dark, the deeper colour being con- 

 tinued some distance on to the body, and ending in a rounded 

 dilation. 



In number of rays in the dorsal and anal fins, this species 

 is intermediate between Z. pimctattis and Z. unimaculattos, as 

 will be seen from the following table : 



Distribution.— A^ yet I have only met with this form in 

 the Clyde estuary. It frequents shallow water, particularly 

 sandy bays overgrown with Zostera. I have taken it, in 

 company with Z. unimaculatus, in Loch Striven and in 

 Rothesay Bay ; and Mr Thomas Scott has also taken one or 

 two very small specimens in East Loch Tarbert. My largest 

 specimen measured 4 J inches in length, 



3. Z. UNIMACULATUS, Eisso. (PI. XVI.) 



Pleuronectes punctatus, Flem. {non Bloch). 

 Rhombus unimaculatus, Risso. 

 ,, uniocellatus, Nardo. 

 Phrynorhombus unimaculatiis, Giinther. 

 Zeugopterus unimaculatus, Steenstrup, Collett, etc. 

 ,, ,, in scnsu, Day. 



Fin formula (Day).— D, 70-80 ; A, 61-68 ; P, 10-12; Y, 6 ; C, 16. 

 Fin formula (own measurements). — D, 75-85 (average of eight specimens, 

 80) ; A, ei-67 (average of eight specimens, 64) ; P, 9, 10 ; V, 6 ; C, 16. 



The dorsal fin does not commence at the anterior margin 

 of the maxillse, but behind the thickened knob forming the 

 dorsal portion of the snout. The first and second rays usually 

 bear fleshy filaments, the first being the longer, and often 



