PLATE 55 
PLATE XL 
GASTEROSTEUS ACULEATUS- 
THREE SPINED STICKLEBACK. 
* THORACII. 
GENERIC CHARACTER. 
Head oblong, smooth ; jaws armed with small teeth : tongue short, 
^>id obtuse : palate smooth : eyes moderate, very little prominent and 
lateral. Branchiostegeus membrane with three, six, and sometimes 
Seven rays : operculum of two pieces, rounded and striated. Body 
marinated on each side and covered with bony plates : distinct Spines 
l>efore the dorsal fin : lateral line straight t ventral behind the pector^ 
but above the sternum. 
. SPECIFIC CHARACTER 
AND 
SYNONYMS. 
Three spines on the back. 
^asterostEus ActJLEATUS .' spinis dorsalibus tribus. Amrt. 
■ Suec, 336. Gmel. T. 1.^.3. p. 1323. 
^enbriscus duobus In dorso arcuato aculeis, totidem in ventre. Kleiut 
miss. pise. 4. p. 43. n- 2. 1. 14./. 45. 
"^Hree-spined Sticklebaok : Penn. Brit. Zool. 3. p. 217. 
tickling, Stachelfisch. Wulff. ichth. p, 30. n. 37. 
