86 



INTRODUCTION TO ZOOLOGT. 



known example; it is taken all round the rocky portions of 

 the coast. So much is it valued, that the finest flounders and 

 plaice are, in some places, cut up to furnish the most tempting 

 bait for the Lobster-pots.* Another species, the Spiny Lobster 

 (Palinurus vulgaris. Fig. 58), attains even larger dimensions, 

 being occasionally taken of eighteen or twenty inches in 

 length, and weighing so much as twelve or fifteen pounds.* 

 It frequents deep water, and only approaches the shores in 

 spring, for the purpose of laying its eggs. 



The Cray-fish {Fig. 59) inhabits rivers in many pai-ts of 



r:^ ^ - 



b 



W , 



Fig. 59. 



W»'li-''!ilIiIiiiP" 



-CUAY-Flsa (EEDCCED).t 



\^ 



Fig. CO. — Masticatiho APPAaATCs.l 



* W. T. 



t Fig. 59. — Exhibits the lower side of the Cray-fish, a and h, Antennip.— c, 

 Kyes. — rf. Auditory tubercle or or^.Tn of hearing.— »>, External feet-jaws. — 



J. Kirst pair of thoracic legs. — g-, FifUi pair. — A, Abdominal false legs i. Tail 



formed for swimming. 



X Fig. (iO.— Shows, in their detached state, the si.x pair of appendages which 

 constitute the apparatus for mastication, n. Mandibles.— A and c, First and 

 second pair of Jaws or niaxillse. — d, e,f. Three pair of feet-jaws. 



