OBTHAGOBISOICOLA MURICATA. 101 



1861. L&margus muricatus P. J. van Beneden. (15) p. 129. pi. xix, 

 figs. 1-4. 



1892. L&margus muricatus A. Scott. Trans. Nat. Hist. Soc. Glasgow 

 vol. iii, pt. 3, p. 266. 



1900. L&margus muricatus T. Scott. (112) p. 158, pi. vi, figs. 39-42. 



1902. Orthagoriscicola muricata Poche. (97) p. 14. 



1907. Orthagoriscicola muricata C. B. Wilson. (148) p. 473, pis. xl & xli. 



1909. Orthagoriscicola muricata E. V. Blwes. (45) p. 20. 



1910. Orthagoriscicola muricata T. R. R. Stebbing. (125) p. 559. 



Female. Carapace trapezoidal in outline, much 

 wider behind than in front, postero-lateral corners 

 broadly rounded, lateral margins minutely serrated, 

 posterior margin slightly incurved, a number of 

 minute spines scattered over the dorsal surface of the 

 carapace, and the frontal plates apparently fused with 

 it. First and second thoracic segments short and about 



O 



half as wide as the carapace, attenuated at the sides 

 and without accessory dorsal plates. The next seg- 

 ment provided with a broad dorsal plate which overlaps 

 a considerable portion of the genital segment and is 

 divided by a median cleft into two broadly-rounded 

 lobes the margins of which are minutely serrated. The 

 genital segment furnished with two large broadly- 

 expanded plates the inner margins of which somewhat 

 overlap each other ; the plates suborbicular in outline 

 and together fully one and a half times the width of 

 the carapace, also entirely concealing the abdomen and 

 caudal rami; their posterior margins broadly rounded 

 and conspicuously serrated. 



Antennules of moderate length and composed of 

 three joints, the first as long as the other two com- 

 bined. Antennas short, armed with stout and strongly- 

 hooked terminal claws. Mandibles long, stylet-shaped, 

 and minutely serrate at the distal end. First maxilli- 

 peds small, provided with short but moderately broad 

 terminal claws serrated on the margins. Second 

 maxillipeds strong ; end joint with one or two marginal 

 processes on its inner aspect and provided with a 

 strong curved terminal claw considerably shorter than 

 the joint to which it is articulated. The thoracic 

 legs all biramose, the rami of the first and second pairs 



