CAEANGID^. 133 



reaches posteriorly to beneath the front edge of the eye. Teeth — in the jaws, 

 vomer, palatine bones, and on the tongue. Fins — spines of first dorsal fin of about 

 equal length : anterior portion of second dorsal somewhat elevated : while the 

 anal is slightly shorter than but otherwise similar to the second dorsal. Pectoral 

 as long as the head behind the middle of the orbit: ventral shorter: free anal 

 spines rather strong. Caudal fin deeply forked. Free portion of the tail about 

 as high anteriorly as it is long. Scales — small : cycloid. Lateral-line — makes a 

 very slight curve to above the commencement of the anal fin, when it proceeds 

 direct to the centre of the base of the caudal fin. Colours — very bright, superiorly 

 gray or greenish, becoming lighter or yellow on the sides and beneath. Three 

 or four gray blotches, sometimes absent, across the anterior portion of the lateral- 

 line. Fins yellowish, the anterior rays of the second dorsal and anal, also the 

 ends of the caudal lobes, stained with black. 



Names. — Glaucus from its light sea-green colour. This fish has also erroneously 

 been termed alhacore by Couch, that being the designation of a tunny (see p. 98). 

 According to Rondeletius, Derhio is a local term employed at Montpellier. 



Breeding. — Risso observes that in the Mediterranean it breeds during the 

 summer. 



As food. — Was esteemed in Greece and Rome. 



Habitat. — Common throughout the Mediterranean and in the Atlantic from 

 the southern shores of Great Britain southwards along the west coast of Africa to 

 the Cape of Good Hope, as well as across the South Atlantic Ocean to the coast 

 of Brazil. 



In October, 1857, Couch obtained an example, 13J- inches in length, from a 

 drift net, which had been employed in the autumn mackerel fishery, in deep water 

 ofi" the Runnel Stone, Mount's Bay, Cornwall. On August 28th, 1878, a second 

 example was captured near Penzance (Cornish, Zool. 1878, p. 423). 



This fish appears to attain to at least 15 inches in length. 



