The Viviparous Blenny:\ OF ORKNEY. 205 



They grew a good deal bigger, and continued very lively, till 

 in a hot day, forgetting to refresh them with clean water, they 

 died to the last fish. 



While they were very young and transparent, they made ex- 

 cellent objects for the common microscrope, for viewing the cir- 

 culation of the blood ; do not answer well in the solar, as the 

 heat of the enlightening lens soon kills them, or renders the 

 skin dry and opaque, thereby hindering much the effect of 

 that most surprising instrument. 



3. Thoracic Fish. — The Ventral Fins placed beneath the 



Pectoral. 



GENUS XIF.— THE GOBY. 



Gen. Char. — Eyes placed near each other ; four branchiostegous rays ; ventral 



fins united. 



Species 1. — The Black Goby. 



Sea-Gudgeon, Rock-Fish, fVil. Icth, 206. Raii Syn. Pise. 76. Gobius niger, 

 Lin. Sys. 449. Brit. Zool. 174. Ore. Black Rock Fishick. 



The Black Goby is found pretty frequent among the deep 

 holes about the point of the Ness of Stromness ; seldom seen 

 here above three or four inches long ; the colour blackish, or 



