159 
OBSERVATIONS ON THE MYOLOGY OF PALINURUS 
EDWARDSII, Worron. 
By Proressor T. Jerrery Parker, D.Sc., F.R.S., anp JosepHine Gorpon Ricu. 
(From the Biological Laboratory of the University of Otago.) 
(Plates xvir.-xx1.) 
CONTENTS. 
PAGE 
INTRODUCTION aac pon 500 980 500 306 50¢ lOO 
I.—Tue Axiat MUSCLEs ... nee 200 506 ee 200 ... 160 
1. Muscles of the abdomen... 400 600 eas ae GO 
2. Muscles of the cephalothorax ... ae 300 500 eos 
IJ.—TuHr APPENDICULAR MUSCLES... sor soe 50" oo ... 168 
1. Extrinsic muscles of the legs... 60 uae 306 .. 168 
2. Extrinsic muscles of the swimmerets ... aise oe ro GS 
3. Muscles of the tail fin... 260 a Aas Coc aso la) 
4, Extrinsic muscles of the second maxilla te ae pod wili(al 
5. Extrinsic muscles of the first maxilla ... nas wee soe LAL 
6. Extrinsic muscles of the mandible ae AOC S00 poo he? 
7. Muscles of the antenna ... ono Sats 500 506 ve TZ 
8. Extrinsic muscles of the antennule ... a50 nee ono Alle! 
9. Muscles of the eye-stalks aie 380 aa ce soon LTD 
SUMMARY... coc cnc 506 o0c AbD noc 50c eG) 
DESCRIPTION OF PLATES... = his ae 506 ere ooo JLUgf 
The sea-crayfish of New Zealand (Paknurus Edwardsiz) and its Australian ally 
(P. Hiigehit) form such convenient students’ types that it is extremely desirable to have 
a readily accessible account of their anatomy. The ordinary text-books deal almost 
exclusively with the Astaczde (Astacus and Homarus), and we have been able to find 
only detached observations on Padinurus, and these mostly on the European form 
P. vulgaris, which differs in so many respects from the species under consideration* 
as to render a detailed description of the latter necessary. 
* See Parker, Trans. N.Z. Inst. Vol. XIX. (1886), p. 150 ; and Spence Bate, Challenger Reports, Vol. XXIV. 
